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data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">"CRAO" redirects here. For the observatory, see <a href="/wiki/Crimean_Astrophysical_Observatory" title="Crimean Astrophysical Observatory">Crimean Astrophysical Observatory</a>. For the <a href="/wiki/Main-belt_asteroid" class="mw-redirect" title="Main-belt asteroid">main-belt asteroid</a>, see <a href="/wiki/1725_CrAO" class="mw-redirect" title="1725 CrAO">1725 CrAO</a>.</div> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Medical condition</div><style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox infobox-has-images-with-white-backgrounds"><tbody><tr><th colspan="2" class="infobox-above" style="background:#ccc">Central retinal artery occlusion</th></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Medical_specialty" title="Medical specialty">Specialty</a></th><td class="infobox-data">Ophthalmology, Neurology</td></tr></tbody></table><style data-mw-deduplicate="TemplateStyles:r1236303919">@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-has-images-with-white-backgrounds img{background:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-has-images-with-white-backgrounds img{background:white}}</style> <p><b>Central retinal artery occlusion</b> (<b>CRAO</b>) is a disease of the <a href="/wiki/Human_eye" title="Human eye">eye</a> where the flow of blood through the <a href="/wiki/Central_retinal_artery" title="Central retinal artery">central retinal artery</a> is blocked (occluded). There are several different causes of this occlusion; the most common is <a href="/wiki/Carotid_artery" title="Carotid artery">carotid artery</a> <a href="/wiki/Atherosclerosis" title="Atherosclerosis">atherosclerosis</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Signs_and_symptoms">Signs and symptoms</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=1" title="Edit section: Signs and symptoms"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Cherry_red_spot_in_patient_with_central_retinal_artery_occlusion_(CRAO).jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/07/Cherry_red_spot_in_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg/390px-Cherry_red_spot_in_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg" decoding="async" width="390" height="279" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/07/Cherry_red_spot_in_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg/585px-Cherry_red_spot_in_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/07/Cherry_red_spot_in_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg/780px-Cherry_red_spot_in_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg 2x" data-file-width="813" data-file-height="582" /></a><figcaption>Cherry red spot in a person with central retinal artery occlusion</figcaption></figure> <p>Central retinal artery occlusion is characterized by painless, acute vision loss in one eye.<sup id="cite_ref-:1_1-0" class="reference"><a href="#cite_note-:1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Upon <a href="/wiki/Fundoscopy" class="mw-redirect" title="Fundoscopy">fundoscopic exam</a>, one would expect to find: <a href="/wiki/Cherry-red_spot" title="Cherry-red spot">cherry-red spot</a> (90%) (a morphologic description in which the normally red background of the choroid is sharply outlined by the swollen opaque retina in the central retina), retinal opacity in the posterior pole (58%), <a href="/wiki/Pallor" title="Pallor">pallor</a> (39%), <a href="/wiki/Hypertensive_retinopathy" title="Hypertensive retinopathy">retinal arterial attenuation</a> (32%), and optic disk <a href="/wiki/Edema" title="Edema">edema</a> (22%).<sup id="cite_ref-:1_1-1" class="reference"><a href="#cite_note-:1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> During later stages of onset, one may also find <a href="/wiki/Atheroma" title="Atheroma">plaques</a>, <a href="/wiki/Embolus" title="Embolus">emboli</a>, and <a href="/wiki/Optic_neuropathy" title="Optic neuropathy">optic atrophy</a>.<sup id="cite_ref-:1_1-2" class="reference"><a href="#cite_note-:1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Diagnosis">Diagnosis</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=2" title="Edit section: Diagnosis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Fluorescein_angiogram_of_patient_with_central_retinal_artery_occlusion_(CRAO).jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/52/Fluorescein_angiogram_of_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg/390px-Fluorescein_angiogram_of_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg" decoding="async" width="390" height="273" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/52/Fluorescein_angiogram_of_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg/585px-Fluorescein_angiogram_of_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/52/Fluorescein_angiogram_of_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg/780px-Fluorescein_angiogram_of_patient_with_central_retinal_artery_occlusion_%28CRAO%29.jpg 2x" data-file-width="875" data-file-height="613" /></a><figcaption>Fluorescein angiogram of a person with central retinal artery occlusion</figcaption></figure> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Ocular_coherence_tomogram_(OCT)_of_a_patient_with_central_retinal_artery_occlusion.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Ocular_coherence_tomogram_%28OCT%29_of_a_patient_with_central_retinal_artery_occlusion.jpg/390px-Ocular_coherence_tomogram_%28OCT%29_of_a_patient_with_central_retinal_artery_occlusion.jpg" decoding="async" width="390" height="216" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Ocular_coherence_tomogram_%28OCT%29_of_a_patient_with_central_retinal_artery_occlusion.jpg/585px-Ocular_coherence_tomogram_%28OCT%29_of_a_patient_with_central_retinal_artery_occlusion.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/83/Ocular_coherence_tomogram_%28OCT%29_of_a_patient_with_central_retinal_artery_occlusion.jpg/780px-Ocular_coherence_tomogram_%28OCT%29_of_a_patient_with_central_retinal_artery_occlusion.jpg 2x" data-file-width="975" data-file-height="539" /></a><figcaption>Ocular coherence tomogram (OCT) of a person with central retinal artery occlusion</figcaption></figure> <p>One diagnostic method for the confirmation of CRAO is <a href="/wiki/Fluorescein_angiography" title="Fluorescein angiography">Fluorescein angiography</a>, it is used to examine the retinal artery filling time after the fluorescein dye is injected into the peripheral <a href="/wiki/Venous_system" class="mw-redirect" title="Venous system">venous system</a>.<sup id="cite_ref-:12_2-0" class="reference"><a href="#cite_note-:12-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> In an eye with CRAO some branches of the retinal artery may not fill or the time it takes for the branches of the retinal artery to fill will be increased, which is visualized by the leading edge of the fluorescein moving slower than normal through the retinal artery branches to the edges of the retina.<sup id="cite_ref-:12_2-1" class="reference"><a href="#cite_note-:12-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Fluorescein angiography can also be used to determine the extent of the occlusion as well as classify it into one of four types non-arteritic CRAO, non-arteritic CRAO with cilioretinal artery sparing, transient non-arteritic CRAO and arteritic CRAO.<sup id="cite_ref-:03_3-0" class="reference"><a href="#cite_note-:03-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Optical coherence tomography (OCT) may also be used to confirm the diagnosis of CRAO.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Causes">Causes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=3" title="Edit section: Causes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>CRAO can be classified based on it pathogenesis, as arteritic versus non-arteritic.<sup id="cite_ref-:0_5-0" class="reference"><a href="#cite_note-:0-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:1_1-3" class="reference"><a href="#cite_note-:1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:2_6-0" class="reference"><a href="#cite_note-:2-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Non-arteritic CRAO is most commonly caused by an <a href="/wiki/Embolus" title="Embolus">embolus</a> and occlusion at the narrowest part of the carotid retinal artery due to plaques in the carotid artery resulting in carotid retinal artery <a href="/wiki/Atherosclerosis" title="Atherosclerosis">atherosclerosis</a>.<sup id="cite_ref-:1_1-4" class="reference"><a href="#cite_note-:1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:0_5-1" class="reference"><a href="#cite_note-:0-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:2_6-1" class="reference"><a href="#cite_note-:2-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Further causes of non-arteritic CRAO may include <a href="/wiki/Vasculitis" title="Vasculitis">vasculitis</a> and chronic systemic autoimmune diseases.<sup id="cite_ref-:0_5-2" class="reference"><a href="#cite_note-:0-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Arteritic CRAO is most commonly caused by <a href="/wiki/Giant_cell_arteritis" title="Giant cell arteritis">giant cell arteritis</a>.<sup id="cite_ref-:0_5-3" class="reference"><a href="#cite_note-:0-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:2_6-2" class="reference"><a href="#cite_note-:2-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Other causes can include dissecting <a href="/wiki/Aneurysms" class="mw-redirect" title="Aneurysms">aneurysms</a> and <a href="/wiki/Vasospasm" title="Vasospasm">arterial spasms</a>, and as a complication of patient positioning causing external compression of the eye compressing flow to the central retinal artery (e.g. in spine surgeries in the prone position).<sup id="cite_ref-UptodateMar14_7-0" class="reference"><a href="#cite_note-UptodateMar14-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Mechanism">Mechanism</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=4" title="Edit section: Mechanism"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Ophthalmic_artery" title="Ophthalmic artery">ophthalmic artery</a> branches off into the <a href="/wiki/Central_retinal_artery" title="Central retinal artery">central retinal artery</a> which travels with the <a href="/wiki/Optic_nerve" title="Optic nerve">optic nerve</a> until it enters the eye.<sup id="cite_ref-Louw_2015_8-0" class="reference"><a href="#cite_note-Louw_2015-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> This central retinal artery provides nutrients to the <a href="/wiki/Retina" title="Retina">retina</a> of the eye, more specifically the inner retina and the surface of the optic nerve.<sup id="cite_ref-Louw_2015_8-1" class="reference"><a href="#cite_note-Louw_2015-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Variations, such as <a href="/wiki/Branch_retinal_artery_occlusion" title="Branch retinal artery occlusion">branch retinal artery occlusion</a>, can also occur.<sup id="cite_ref-Louw_2015_8-2" class="reference"><a href="#cite_note-Louw_2015-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Central retinal artery occlusion is most often due to emboli blocking the artery and therefore prevents the artery from delivering nutrients to most of the retina.<sup id="cite_ref-Michalinos_2015_9-0" class="reference"><a href="#cite_note-Michalinos_2015-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> These emboli originate from the carotid arteries most of the time but in 25% of cases, this is due to plaque build-up in the ophthalmic artery.<sup id="cite_ref-Michalinos_2015_9-1" class="reference"><a href="#cite_note-Michalinos_2015-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> The most frequent site of blockage is at the most narrow part of the artery which is where the artery pierces the dura covering the optic nerve.<sup id="cite_ref-Michalinos_2015_9-2" class="reference"><a href="#cite_note-Michalinos_2015-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Some people have cilioretinal arterial branches,<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> which may or may not be included in the blocked portion.<sup id="cite_ref-Michalinos_2015_9-3" class="reference"><a href="#cite_note-Michalinos_2015-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Treatment">Treatment</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=5" title="Edit section: Treatment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>While no treatment has been clearly demonstrated to be benefit for CRAO in large systematic reviews of randomized clinical trials, many of the following are frequently used:<sup id="cite_ref-:02_11-0" class="reference"><a href="#cite_note-:02-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <ul><li>Lowering <a href="/wiki/Intraocular_pressure" title="Intraocular pressure">intraocular pressure</a>;</li> <li>Dilating the CRA;</li> <li>Increasing oxygenation;</li> <li>Isovolemic hemodilution;</li> <li>Anticoagulation;</li> <li>Dislodging or fragmenting thrombus or embolus;</li> <li><a href="/wiki/Thrombolysis" title="Thrombolysis">Thrombolysis</a>; and</li> <li><a href="/wiki/Hyperbaric_oxygen" class="mw-redirect" title="Hyperbaric oxygen">Hyperbaric oxygen</a>.</li></ul> <p>To achieve the best outcome for a person with CRAO, it is important to identify the condition in a timely manner and to refer to the appropriate specialist.<sup id="cite_ref-:02_11-1" class="reference"><a href="#cite_note-:02-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Prognosis">Prognosis</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=6" title="Edit section: Prognosis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The artery can re-canalize over time and the edema can clear. However, optic atrophy leads to permanent loss of vision. Irreversible damage to neural tissue can occur after approximately 15 minutes of complete blockage to the central retinal artery, but this time may vary between people.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> Two thirds of people experience 20/400 vision while only one in six will experience 20/40 vision or better.<sup id="cite_ref-Kunimoto_13-0" class="reference"><a href="#cite_note-Kunimoto-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Epidemiology">Epidemiology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=7" title="Edit section: Epidemiology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The incidence of CRAO is approximately 1 in 100,000 people in the general population.<sup id="cite_ref-Farris_2019_14-0" class="reference"><a href="#cite_note-Farris_2019-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> Risk factors for CRAO include the following: being over 50 years of age, male gender, smoking, <a href="/wiki/Hypertension" title="Hypertension">hypertension</a>, tranexamic acid, <a href="/wiki/Diabetes_mellitus" class="mw-redirect" title="Diabetes mellitus">diabetes mellitus</a>, <a href="/wiki/Dyslipidemia" title="Dyslipidemia">dyslipidemia</a>, <a href="/wiki/Angina" title="Angina">angina</a>, <a href="/wiki/Valvular_heart_disease" title="Valvular heart disease">valvular disease</a>, transient <a href="/wiki/Hemiparesis" title="Hemiparesis">hemiparesis</a>, cancer, <a href="/wiki/Hypercoagulable" class="mw-redirect" title="Hypercoagulable">hypercoagulable</a> blood conditions, lupus, or a family history of cerebrovascular or cardiovascular issues.<sup id="cite_ref-Farris_2019_14-1" class="reference"><a href="#cite_note-Farris_2019-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=8" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Central_retinal_vein_occlusion" title="Central retinal vein occlusion">Central retinal vein occlusion</a></li> <li><a href="/wiki/Branch_retinal_artery_occlusion" title="Branch retinal artery occlusion">Branch retinal artery occlusion</a></li> <li><a href="/wiki/Branch_retinal_vein_occlusion" title="Branch retinal vein occlusion">Branch retinal vein occlusion</a></li> <li><a href="/wiki/Amaurosis_fugax" title="Amaurosis fugax">Amaurosis fugax</a></li> <li><a href="/wiki/Ocular_ischemic_syndrome" title="Ocular ischemic syndrome">Ocular ischemic syndrome</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Central_retinal_artery_occlusion&action=edit&section=9" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-:1-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-:1_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:1_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-:1_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-:1_1-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-:1_1-4"><sup><i><b>e</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output 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style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;background: #EAECF0;color:black;">Classification</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><div style="position:relative; float:right; font-size:0.8em;"><a href="https://www.wikidata.org/wiki/Q3348620" class="extiw" title="d:Q3348620">D</a></div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;background: #EAECF0;color:black;">External resources</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><div class="hlist" style="text-align:left;"><ul><li><b><a href="/wiki/EMedicine" title="EMedicine">eMedicine</a></b>: <a rel="nofollow" class="external text" href="https://emedicine.medscape.com/article/1223625-overview">article/1223625</a></li></ul></div></div></td></tr></tbody></table></div> <div 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4em"><a href="/wiki/Accessory_visual_structures" title="Accessory visual structures">Adnexa</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Eyelid" title="Eyelid">Eyelid</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Inflammation23" scope="row" class="navbox-group" style="width:1%">Inflammation</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Stye" title="Stye">Stye</a></li> <li><a href="/wiki/Chalazion" title="Chalazion">Chalazion</a></li> <li><a href="/wiki/Blepharitis" title="Blepharitis">Blepharitis</a></li> <li><a href="/wiki/Meibomian_gland_dysfunction" title="Meibomian gland dysfunction">Meibomian gland dysfunction</a></li></ul> </div></td></tr><tr><td colspan="2" class="navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Entropion" title="Entropion">Entropion</a></li> <li><a href="/wiki/Ectropion" title="Ectropion">Ectropion</a></li> <li><a href="/wiki/Lagophthalmos" title="Lagophthalmos">Lagophthalmos</a></li> <li><a href="/wiki/Blepharochalasis" title="Blepharochalasis">Blepharochalasis</a></li> <li><a href="/wiki/Ptosis_(eyelid)" title="Ptosis (eyelid)">Ptosis</a></li> <li><a href="/wiki/Blepharophimosis" title="Blepharophimosis">Blepharophimosis</a></li> <li><a href="/wiki/Xanthelasma" title="Xanthelasma">Xanthelasma</a></li> <li><a href="/wiki/Ankyloblepharon" title="Ankyloblepharon">Ankyloblepharon</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Eyelash" title="Eyelash">Eyelash</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Trichiasis" title="Trichiasis">Trichiasis</a></li> <li><a href="/wiki/Madarosis" title="Madarosis">Madarosis</a></li> <li><a href="/wiki/Distichiasis" class="mw-redirect" title="Distichiasis">Distichiasis</a></li> <li><a href="/wiki/Trichomegaly" title="Trichomegaly">Trichomegaly</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Lacrimal_apparatus" title="Lacrimal apparatus">Lacrimal apparatus</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Dacryoadenitis" title="Dacryoadenitis">Dacryoadenitis</a></li> <li><a href="/wiki/Epiphora_(medicine)" title="Epiphora (medicine)">Epiphora</a></li> <li><a href="/wiki/Dacryocystitis" title="Dacryocystitis">Dacryocystitis</a></li> <li><a href="/wiki/Xerophthalmia" title="Xerophthalmia">Xerophthalmia</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Orbit_(anatomy)" title="Orbit (anatomy)">Orbit</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Exophthalmos" title="Exophthalmos">Exophthalmos</a></li> <li><a href="/wiki/Enophthalmos" title="Enophthalmos">Enophthalmos</a></li> <li><a href="/wiki/Orbital_cellulitis" title="Orbital cellulitis">Orbital cellulitis</a></li> <li><a href="/wiki/Orbital_lymphoma" title="Orbital lymphoma">Orbital lymphoma</a></li> <li><a href="/wiki/Periorbital_cellulitis" title="Periorbital cellulitis">Periorbital cellulitis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Conjunctiva" title="Conjunctiva">Conjunctiva</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chemosis" title="Chemosis">Chemosis</a></li> <li><a href="/wiki/Conjunctivitis" title="Conjunctivitis">Conjunctivitis</a> <ul><li><a href="/wiki/Allergic_conjunctivitis" title="Allergic conjunctivitis">allergic</a></li></ul></li> <li><a href="/wiki/Pterygium_(conjunctiva)" class="mw-redirect" title="Pterygium (conjunctiva)">Pterygium</a></li> <li><a href="/wiki/Pseudopterygium" title="Pseudopterygium">Pseudopterygium</a></li> <li><a href="/wiki/Pinguecula" title="Pinguecula">Pinguecula</a></li> <li><a href="/wiki/Subconjunctival_bleeding" title="Subconjunctival bleeding">Subconjunctival hemorrhage</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Globe126" style="font-size:114%;margin:0 4em"><a href="/wiki/Globe_(human_eye)" title="Globe (human eye)">Globe</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Fibrous_tunic_of_eyeball" title="Fibrous tunic of eyeball">Fibrous tunic</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Sclera" title="Sclera">Sclera</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Scleritis" title="Scleritis">Scleritis</a></li> <li><a href="/wiki/Episcleritis" title="Episcleritis">Episcleritis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Cornea" title="Cornea">Cornea</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Keratitis" title="Keratitis">Keratitis</a> <ul><li><a href="/wiki/Herpetic_keratitis" class="mw-redirect" title="Herpetic keratitis">herpetic</a></li> <li><a href="/wiki/Acanthamoeba_keratitis" title="Acanthamoeba keratitis">acanthamoebic</a></li> <li><a href="/wiki/Fungal_keratitis" title="Fungal keratitis">fungal</a></li> <li><a href="/wiki/Exposure_keratitis" class="mw-redirect" title="Exposure keratitis">Exposure</a></li> <li><a href="/wiki/Photokeratitis" title="Photokeratitis">Photokeratitis</a></li></ul></li> <li><a href="/wiki/Corneal_ulcer" title="Corneal ulcer">Corneal ulcer</a></li> <li><a href="/wiki/Thygeson%27s_superficial_punctate_keratopathy" title="Thygeson's superficial punctate keratopathy">Thygeson's superficial punctate keratopathy</a></li> <li><a href="/wiki/Corneal_dystrophy" title="Corneal dystrophy">Corneal dystrophy</a> <ul><li><a href="/wiki/Fuchs%27_dystrophy" title="Fuchs' dystrophy">Fuchs'</a></li> <li><a href="/wiki/Meesmann_corneal_dystrophy" title="Meesmann corneal dystrophy">Meesmann</a></li></ul></li> <li><a href="/wiki/Corneal_ectatic_disorders" title="Corneal ectatic disorders">Corneal ectasia</a> <ul><li><a href="/wiki/Keratoconus" title="Keratoconus">Keratoconus</a></li> <li><a href="/wiki/Pellucid_marginal_degeneration" title="Pellucid marginal degeneration">Pellucid marginal degeneration</a></li> <li><a href="/wiki/Keratoglobus" title="Keratoglobus">Keratoglobus</a></li> <li><a href="/wiki/Terrien%27s_marginal_degeneration" title="Terrien's marginal degeneration">Terrien's marginal degeneration</a></li> <li><a href="/wiki/Post-LASIK_ectasia" title="Post-LASIK ectasia">Post-LASIK ectasia</a></li></ul></li> <li><a href="/wiki/Keratoconjunctivitis" title="Keratoconjunctivitis">Keratoconjunctivitis</a> <ul><li><a href="/wiki/Keratoconjunctivitis_sicca" class="mw-redirect" title="Keratoconjunctivitis sicca">sicca</a></li></ul></li> <li><a href="/wiki/Corneal_opacity" title="Corneal opacity">Corneal opacity</a></li> <li><a href="/wiki/Corneal_neovascularization" title="Corneal neovascularization">Corneal neovascularization</a></li> <li><a href="/wiki/Kayser%E2%80%93Fleischer_ring" title="Kayser–Fleischer ring">Kayser–Fleischer ring</a></li> <li><a href="/wiki/Haab%27s_striae" title="Haab's striae">Haab's striae</a></li> <li><a href="/wiki/Arcus_senilis" title="Arcus senilis">Arcus senilis</a></li> <li><a href="/wiki/Band_keratopathy" title="Band keratopathy">Band keratopathy</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Uvea" title="Uvea">Vascular tunic</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><div class="hlist"><ul><li><a href="/wiki/Iris_(anatomy)" title="Iris (anatomy)">Iris</a></li><li><a href="/wiki/Ciliary_body" title="Ciliary body">Ciliary body</a></li></ul></div></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Uveitis" title="Uveitis">Uveitis</a></li> <li><a href="/wiki/Intermediate_uveitis" title="Intermediate uveitis">Intermediate uveitis</a></li> <li><a href="/wiki/Hyphema" title="Hyphema">Hyphema</a></li> <li><a href="/wiki/Rubeosis_iridis" title="Rubeosis iridis">Rubeosis iridis</a></li> <li><a href="/wiki/Persistent_pupillary_membrane" title="Persistent pupillary membrane">Persistent pupillary membrane</a></li> <li><a href="/wiki/Iridodialysis" title="Iridodialysis">Iridodialysis</a></li> <li><a href="/wiki/Synechia_(eye)" title="Synechia (eye)">Synechia</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Choroid" title="Choroid">Choroid</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Choroideremia" title="Choroideremia">Choroideremia</a></li> <li><a href="/wiki/Choroiditis" class="mw-redirect" title="Choroiditis">Choroiditis</a> <ul><li><a href="/wiki/Chorioretinitis" title="Chorioretinitis">Chorioretinitis</a></li></ul></li> <li><a href="/wiki/Focal_choroidal_excavation" title="Focal choroidal excavation">Focal choroidal excavation</a></li> <li><a href="/wiki/Polypoidal_choroidal_vasculopathy" title="Polypoidal choroidal vasculopathy">Polypoidal choroidal vasculopathy</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Lens_(anatomy)" class="mw-redirect" title="Lens (anatomy)">Lens</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cataract" title="Cataract">Cataract</a> <ul><li><a href="/wiki/Congenital_cataract" title="Congenital cataract">Congenital cataract</a></li> <li><a href="/wiki/Childhood_cataract" title="Childhood cataract">Childhood cataract</a></li></ul></li> <li><a href="/wiki/Aphakia" title="Aphakia">Aphakia</a></li> <li><a href="/wiki/Ectopia_lentis" title="Ectopia lentis">Ectopia lentis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Retinal_disease" class="mw-redirect" title="Retinal disease">Retina</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Retinitis" title="Retinitis">Retinitis</a> <ul><li><a href="/wiki/Chorioretinitis" title="Chorioretinitis">Chorioretinitis</a></li> <li><a href="/wiki/Cytomegalovirus_retinitis" title="Cytomegalovirus retinitis">Cytomegalovirus retinitis</a></li></ul></li> <li><a href="/wiki/Retinal_detachment" title="Retinal detachment">Retinal detachment</a> <ul><li><a href="/wiki/Posterior_vitreous_detachment" title="Posterior vitreous detachment">Posterior vitreous detachment</a></li></ul></li> <li><a href="/wiki/Retinoschisis" title="Retinoschisis">Retinoschisis</a></li> <li><a href="/wiki/Ocular_ischemic_syndrome" title="Ocular ischemic syndrome">Ocular ischemic syndrome</a> / <a href="/wiki/Central_retinal_vein_occlusion" title="Central retinal vein occlusion">Central retinal vein occlusion</a></li> <li><a class="mw-selflink selflink">Central retinal artery occlusion</a></li> <li><a href="/wiki/Branch_retinal_artery_occlusion" title="Branch retinal artery occlusion">Branch retinal artery occlusion</a></li> <li><a href="/wiki/Retinopathy" title="Retinopathy">Retinopathy</a> <ul><li><a href="/wiki/Diabetic_retinopathy" title="Diabetic retinopathy">diabetic</a></li> <li><a href="/wiki/Hypertensive_retinopathy" title="Hypertensive retinopathy">hypertensive</a></li> <li><a href="/wiki/Purtscher%27s_retinopathy" title="Purtscher's retinopathy">Purtscher's</a></li> <li><a href="/wiki/Retinopathy_of_prematurity" title="Retinopathy of prematurity">of prematurity</a></li> <li><a href="/wiki/Bietti%27s_crystalline_dystrophy" title="Bietti's crystalline dystrophy">Bietti's crystalline dystrophy</a></li> <li><a href="/wiki/Coats%27_disease" title="Coats' disease">Coats' disease</a></li> <li><a href="/wiki/Sickle_cell_retinopathy" title="Sickle cell retinopathy">Sickle cell</a></li> <li><a href="/wiki/Photic_retinopathy" title="Photic retinopathy">photic</a></li></ul></li> <li><a href="/wiki/Macular_degeneration" title="Macular degeneration">Macular degeneration</a></li> <li><a href="/wiki/Retinitis_pigmentosa" title="Retinitis pigmentosa">Retinitis pigmentosa</a></li> <li><a href="/wiki/Retinal_haemorrhage" title="Retinal haemorrhage">Retinal haemorrhage</a></li> <li><a href="/wiki/Central_serous_retinopathy" class="mw-redirect" title="Central serous retinopathy">Central serous retinopathy</a></li> <li><a href="/wiki/Macular_edema" title="Macular edema">Macular edema</a></li> <li><a href="/wiki/Epiretinal_membrane" title="Epiretinal membrane">Epiretinal membrane</a> (Macular pucker)</li> <li><a href="/wiki/Vitelliform_macular_dystrophy" title="Vitelliform macular dystrophy">Vitelliform macular dystrophy</a></li> <li><a href="/wiki/Leber%27s_congenital_amaurosis" class="mw-redirect" title="Leber's congenital amaurosis">Leber's congenital amaurosis</a></li> <li><a href="/wiki/Birdshot_chorioretinopathy" title="Birdshot chorioretinopathy">Birdshot chorioretinopathy</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Glaucoma" title="Glaucoma">Glaucoma</a> / <a href="/wiki/Ocular_hypertension" title="Ocular hypertension">Ocular hypertension</a> / <a href="/wiki/Primary_juvenile_glaucoma" class="mw-redirect" title="Primary juvenile glaucoma">Primary juvenile glaucoma</a></li> <li><a href="/wiki/Floater" title="Floater">Floater</a></li> <li><a href="/wiki/Leber%27s_hereditary_optic_neuropathy" title="Leber's hereditary optic neuropathy">Leber's hereditary optic neuropathy</a></li> <li><a href="/wiki/Ocular_hypotony" title="Ocular hypotony">Ocular hypotony</a></li> <li><a href="/wiki/Red_eye_(medicine)" title="Red eye (medicine)">Red eye</a></li> <li><a href="/wiki/Globe_rupture" title="Globe rupture">Globe rupture</a></li> <li><a href="/wiki/Fungal_keratitis" title="Fungal keratitis">Keratomycosis</a></li> <li><a href="/wiki/Phthisis_bulbi" title="Phthisis bulbi">Phthisis bulbi</a></li> <li><a href="/wiki/Persistent_fetal_vasculature" title="Persistent fetal vasculature">Persistent fetal vasculature</a></li> <li><a href="/wiki/Persistent_tunica_vasculosa_lentis" title="Persistent tunica vasculosa lentis">Persistent tunica vasculosa lentis</a></li> <li><a href="/wiki/Familial_exudative_vitreoretinopathy" title="Familial exudative vitreoretinopathy">Familial exudative vitreoretinopathy</a></li> <li><a href="/wiki/Vogt-Koyanagi-Harada_disease" class="mw-redirect" title="Vogt-Koyanagi-Harada disease">Vogt-Koyanagi-Harada disease</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Pathways126" style="font-size:114%;margin:0 4em"><a href="/wiki/Visual_system" title="Visual system">Pathways</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Optic_nerve" title="Optic nerve">Optic nerve</a><br /><a href="/wiki/Optic_disc" title="Optic disc">Optic disc</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Optic_neuritis" title="Optic neuritis">Optic neuritis</a> <ul><li><a href="/wiki/Optic_papillitis" title="Optic papillitis">optic papillitis</a></li></ul></li> <li><a href="/wiki/Papilledema" title="Papilledema">Papilledema</a> <ul><li><a href="/wiki/Foster_Kennedy_syndrome" title="Foster Kennedy syndrome">Foster Kennedy syndrome</a></li></ul></li> <li><a href="/wiki/Optic_atrophy" class="mw-redirect" title="Optic atrophy">Optic atrophy</a></li> <li><a href="/wiki/Optic_disc_drusen" title="Optic disc drusen">Optic disc drusen</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Optic_neuropathy" title="Optic neuropathy">Optic neuropathy</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ischemic_optic_neuropathy" title="Ischemic optic neuropathy">Ischemic</a> <ul><li><a href="/wiki/Anterior_ischemic_optic_neuropathy" title="Anterior ischemic optic neuropathy">anterior (AION)</a></li> <li><a href="/wiki/Posterior_ischemic_optic_neuropathy" title="Posterior ischemic optic neuropathy">posterior (PION)</a></li> <li><a href="/wiki/Arteritic_anterior_ischemic_optic_neuropathy" title="Arteritic anterior ischemic optic neuropathy">arteritic anterior (AAION or arteritic AION)</a></li> <li><a href="/wiki/Non-arteritic_anterior_ischemic_optic_neuropathy" title="Non-arteritic anterior ischemic optic neuropathy">non-arteritic anterior (NAION)</a></li></ul></li> <li><a href="/wiki/Kjer%27s_optic_neuropathy" title="Kjer's optic neuropathy">Kjer's</a></li> <li><a href="/wiki/Leber%27s_hereditary_optic_neuropathy" title="Leber's hereditary optic neuropathy">Leber's hereditary</a></li> <li><a href="/wiki/Toxic_and_nutritional_optic_neuropathy" title="Toxic and nutritional optic neuropathy">Toxic and nutritional</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Strabismus" title="Strabismus">Strabismus</a><br /><a href="/wiki/Extraocular_muscles" title="Extraocular muscles">Extraocular muscles</a><br /><a href="/wiki/Binocular_vision" title="Binocular vision">Binocular vision</a><br /><a href="/wiki/Accommodation_(eye)" class="mw-redirect" title="Accommodation (eye)">Accommodation</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Paralytic_strabismus119" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Strabismus#Paralytic_strabismus" title="Strabismus">Paralytic strabismus</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ophthalmoparesis" title="Ophthalmoparesis">Ophthalmoparesis</a></li> <li><a href="/wiki/Chronic_progressive_external_ophthalmoplegia" title="Chronic progressive external ophthalmoplegia">Chronic progressive external ophthalmoplegia</a></li> <li><a href="/wiki/Kearns%E2%80%93Sayre_syndrome" title="Kearns–Sayre syndrome">Kearns–Sayre syndrome</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Cranial_nerve_disease" title="Cranial nerve disease">palsies</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Oculomotor_nerve_palsy" title="Oculomotor nerve palsy">Oculomotor (III)</a></li> <li><a href="/wiki/Fourth_nerve_palsy" title="Fourth nerve palsy">Fourth-nerve (IV)</a></li> <li><a href="/wiki/Sixth_nerve_palsy" title="Sixth nerve palsy">Sixth-nerve (VI)</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Strabismus#Other_strabismus" title="Strabismus">Other strabismus</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Esotropia" title="Esotropia">Esotropia</a> / <a href="/wiki/Exotropia" title="Exotropia">Exotropia</a></li> <li><a href="/wiki/Hypertropia" title="Hypertropia">Hypertropia</a></li> <li><a href="/wiki/Heterophoria" title="Heterophoria">Heterophoria</a> <ul><li><a href="/wiki/Esophoria" title="Esophoria">Esophoria</a></li> <li><a href="/wiki/Exophoria" title="Exophoria">Exophoria</a></li></ul></li> <li><a href="/wiki/Cyclotropia" title="Cyclotropia">Cyclotropia</a></li> <li><a href="/wiki/Brown%27s_syndrome" title="Brown's syndrome">Brown's syndrome</a></li> <li><a href="/wiki/Duane_syndrome" title="Duane syndrome">Duane syndrome</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other binocular</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Conjugate_gaze_palsy" title="Conjugate gaze palsy">Conjugate gaze palsy</a></li> <li><a href="/wiki/Convergence_insufficiency" title="Convergence insufficiency">Convergence insufficiency</a></li> <li><a href="/wiki/Internuclear_ophthalmoplegia" title="Internuclear ophthalmoplegia">Internuclear ophthalmoplegia</a></li> <li><a href="/wiki/One_and_a_half_syndrome" title="One and a half syndrome">One and a half syndrome</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Refraction" title="Refraction">Refraction</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Refractive_error" title="Refractive error">Refractive error</a> <ul><li><a href="/wiki/Far-sightedness" class="mw-redirect" title="Far-sightedness">Hyperopia</a></li> <li><a href="/wiki/Near-sightedness" class="mw-redirect" title="Near-sightedness">Myopia</a></li></ul></li> <li><a href="/wiki/Astigmatism" title="Astigmatism">Astigmatism</a></li> <li><a href="/wiki/Anisometropia" title="Anisometropia">Anisometropia</a> / <a href="/wiki/Aniseikonia" title="Aniseikonia">Aniseikonia</a></li> <li><a href="/wiki/Presbyopia" title="Presbyopia">Presbyopia</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Vision_disorder" title="Vision disorder">Vision disorders</a><br /><a href="/wiki/Blindness" class="mw-redirect" title="Blindness">Blindness</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Amblyopia" title="Amblyopia">Amblyopia</a></li> <li><a href="/wiki/Leber%27s_congenital_amaurosis" class="mw-redirect" title="Leber's congenital amaurosis">Leber's congenital amaurosis</a></li> <li><a href="/wiki/Diplopia" title="Diplopia">Diplopia</a></li> <li><a href="/wiki/Scotoma" title="Scotoma">Scotoma</a></li> <li><a href="/wiki/Color_blindness" title="Color blindness">Color blindness</a> <ul><li><a href="/wiki/Achromatopsia" title="Achromatopsia">Achromatopsia</a></li> <li><a href="/wiki/Dichromacy" title="Dichromacy">Dichromacy</a></li> <li><a href="/wiki/Monochromacy" title="Monochromacy">Monochromacy</a></li></ul></li> <li><a href="/wiki/Nyctalopia" title="Nyctalopia">Nyctalopia</a> <ul><li><a href="/wiki/Oguchi_disease" title="Oguchi disease">Oguchi disease</a></li></ul></li> <li><a href="/wiki/Blindness" class="mw-redirect" title="Blindness">Blindness</a> / <a href="/wiki/Vision_loss" class="mw-redirect" title="Vision loss">Vision loss</a> / <a href="/wiki/Visual_impairment" title="Visual impairment">Visual impairment</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Anopsia" title="Anopsia">Anopsia</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Hemianopsia" title="Hemianopsia">Hemianopsia</a> <ul><li><a href="/wiki/Binasal_hemianopsia" title="Binasal hemianopsia">binasal</a></li> <li><a href="/wiki/Bitemporal_hemianopsia" title="Bitemporal hemianopsia">bitemporal</a></li> <li><a href="/wiki/Homonymous_hemianopsia" title="Homonymous hemianopsia">homonymous</a></li></ul></li> <li><a href="/wiki/Quadrantanopia" title="Quadrantanopia">Quadrantanopia</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">subjective</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Asthenopia" class="mw-redirect" title="Asthenopia">Asthenopia</a></li> <li><a href="/wiki/Hemeralopia" title="Hemeralopia">Hemeralopia</a></li> <li><a href="/wiki/Photophobia" title="Photophobia">Photophobia</a></li> <li><a href="/wiki/Scintillating_scotoma" title="Scintillating scotoma">Scintillating scotoma</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Pupil" title="Pupil">Pupil</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Anisocoria" title="Anisocoria">Anisocoria</a></li> <li><a href="/wiki/Argyll_Robertson_pupil" title="Argyll Robertson pupil">Argyll Robertson 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