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mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%83%AD%E3%82%B0%E3%82%A4%E3%83%B3&returnto=%E8%82%89%E7%9C%BC" title="ログインすることを推奨します。ただし、必須ではありません。 [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>ログイン</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> ログアウトした編集者のページ <a href="/wiki/Wikipedia:%E3%82%A6%E3%82%A3%E3%82%AD%E3%83%9A%E3%83%87%E3%82%A3%E3%82%A2%E3%81%B8%E3%82%88%E3%81%86%E3%81%93%E3%81%9D" aria-label="編集の詳細"><span>もっと詳しく</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E8%87%AA%E5%88%86%E3%81%AE%E6%8A%95%E7%A8%BF%E8%A8%98%E9%8C%B2" title="このIPアドレスからなされた編集の一覧 [y]" accesskey="y"><span>投稿記録</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E3%83%88%E3%83%BC%E3%82%AF%E3%83%9A%E3%83%BC%E3%82%B8" title="このIPアドレスからなされた編集についての議論 [n]" accesskey="n"><span>トーク</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="サイト"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="目次" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">目次</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">非表示</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">ページ先頭</div> </a> </li> <li id="toc-一般な用法として" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#一般な用法として"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>一般な用法として</span> </div> </a> <ul id="toc-一般な用法として-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-肉眼の使用状況の変化" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#肉眼の使用状況の変化"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>肉眼の使用状況の変化</span> </div> </a> <ul id="toc-肉眼の使用状況の変化-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-天文学として" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#天文学として"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>天文学として</span> </div> </a> <ul id="toc-天文学として-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-脚注" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#脚注"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>脚注</span> </div> </a> <ul id="toc-脚注-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="目次" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="目次の表示・非表示を切り替え" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">目次の表示・非表示を切り替え</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">肉眼</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="特定の記事の別の言語版に移動します。利用可能な言語36件" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-36" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">36の言語版</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A7%D9%84%D8%B9%D9%8A%D9%86_%D8%A7%D9%84%D9%85%D8%AC%D8%B1%D8%AF%D8%A9" title="アラビア語: العين المجردة" lang="ar" hreflang="ar" data-title="العين المجردة" data-language-autonym="العربية" data-language-local-name="アラビア語" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Simple_vista" title="アストゥリアス語: Simple vista" lang="ast" hreflang="ast" data-title="Simple vista" data-language-autonym="Asturianu" data-language-local-name="アストゥリアス語" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Golo_oko" title="ボスニア語: Golo oko" lang="bs" hreflang="bs" data-title="Golo oko" data-language-autonym="Bosanski" data-language-local-name="ボスニア語" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Ull_nu" title="カタロニア語: Ull nu" lang="ca" hreflang="ca" data-title="Ull nu" data-language-autonym="Català" data-language-local-name="カタロニア語" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%86%D8%A7%D9%88%DB%8C_%D9%BE%DB%95%D8%AA%DB%8C" title="中央クルド語: چاوی پەتی" lang="ckb" hreflang="ckb" data-title="چاوی پەتی" data-language-autonym="کوردی" data-language-local-name="中央クルド語" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Pouh%C3%BDm_okem" title="チェコ語: Pouhým okem" lang="cs" hreflang="cs" data-title="Pouhým okem" data-language-autonym="Čeština" data-language-local-name="チェコ語" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Frei%C3%A4ugig" title="ドイツ語: Freiäugig" lang="de" hreflang="de" data-title="Freiäugig" data-language-autonym="Deutsch" data-language-local-name="ドイツ語" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Naked_eye" title="英語: Naked eye" lang="en" hreflang="en" data-title="Naked eye" data-language-autonym="English" data-language-local-name="英語" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Nuda_okulo" title="エスペラント語: Nuda okulo" lang="eo" hreflang="eo" data-title="Nuda okulo" data-language-autonym="Esperanto" data-language-local-name="エスペラント語" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Simple_vista" title="スペイン語: Simple vista" lang="es" hreflang="es" data-title="Simple vista" data-language-autonym="Español" data-language-local-name="スペイン語" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Paljas_silm" title="エストニア語: Paljas silm" lang="et" hreflang="et" data-title="Paljas silm" data-language-autonym="Eesti" data-language-local-name="エストニア語" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Begi_huts" title="バスク語: Begi huts" lang="eu" hreflang="eu" data-title="Begi huts" data-language-autonym="Euskara" data-language-local-name="バスク語" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%86%D8%B4%D9%85_%D8%BA%DB%8C%D8%B1%D9%85%D8%B3%D9%84%D8%AD" title="ペルシア語: چشم غیرمسلح" lang="fa" hreflang="fa" data-title="چشم غیرمسلح" data-language-autonym="فارسی" data-language-local-name="ペルシア語" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/%C5%92il_nu" title="フランス語: Œil nu" lang="fr" hreflang="fr" data-title="Œil nu" data-language-autonym="Français" data-language-local-name="フランス語" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A2%D7%99%D7%9F_%D7%91%D7%9C%D7%AA%D7%99_%D7%9E%D7%96%D7%95%D7%99%D7%A0%D7%AA" title="ヘブライ語: עין בלתי מזוינת" lang="he" hreflang="he" data-title="עין בלתי מזוינת" data-language-autonym="עברית" data-language-local-name="ヘブライ語" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%A8%E0%A4%97%E0%A5%8D%E0%A4%A8_%E0%A4%86%E0%A4%81%E0%A4%96" title="ヒンディー語: नग्न आँख" lang="hi" hreflang="hi" data-title="नग्न आँख" data-language-autonym="हिन्दी" data-language-local-name="ヒンディー語" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Mata_telanjang" title="インドネシア語: Mata telanjang" lang="id" hreflang="id" data-title="Mata telanjang" data-language-autonym="Bahasa Indonesia" data-language-local-name="インドネシア語" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Occhio_nudo" title="イタリア語: Occhio nudo" lang="it" hreflang="it" data-title="Occhio nudo" data-language-autonym="Italiano" data-language-local-name="イタリア語" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9C%A1%EC%95%88" title="韓国語: 육안" lang="ko" hreflang="ko" data-title="육안" data-language-autonym="한국어" data-language-local-name="韓国語" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Mat_bloussem_A" title="ルクセンブルク語: Mat bloussem A" lang="lb" hreflang="lb" data-title="Mat bloussem A" data-language-autonym="Lëtzebuergesch" data-language-local-name="ルクセンブルク語" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Neapbru%C5%86ota_acs" title="ラトビア語: Neapbruņota acs" lang="lv" hreflang="lv" data-title="Neapbruņota acs" data-language-autonym="Latviešu" data-language-local-name="ラトビア語" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%A8%E0%B4%97%E0%B5%8D%E0%B4%A8_%E0%B4%A8%E0%B5%87%E0%B4%A4%E0%B5%8D%E0%B4%B0%E0%B4%82" title="マラヤーラム語: നഗ്ന നേത്രം" lang="ml" hreflang="ml" data-title="നഗ്ന നേത്രം" data-language-autonym="മലയാളം" data-language-local-name="マラヤーラム語" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Mata_kasar" title="マレー語: Mata kasar" lang="ms" hreflang="ms" data-title="Mata kasar" data-language-autonym="Bahasa Melayu" data-language-local-name="マレー語" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Freesichtigkeit" title="低地ドイツ語: Freesichtigkeit" lang="nds" hreflang="nds" data-title="Freesichtigkeit" data-language-autonym="Plattdüütsch" data-language-local-name="低地ドイツ語" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Blote_oog" title="オランダ語: Blote oog" lang="nl" hreflang="nl" data-title="Blote oog" data-language-autonym="Nederlands" data-language-local-name="オランダ語" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Blotte_%C3%B8ye" title="ノルウェー語(ブークモール): Blotte øye" lang="nb" hreflang="nb" data-title="Blotte øye" data-language-autonym="Norsk bokmål" data-language-local-name="ノルウェー語(ブークモール)" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%A8%E0%A9%B0%E0%A8%97%E0%A9%80_%E0%A8%85%E0%A9%B1%E0%A8%96" title="パンジャブ語: ਨੰਗੀ ਅੱਖ" lang="pa" hreflang="pa" data-title="ਨੰਗੀ ਅੱਖ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="パンジャブ語" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Go%C5%82e_oko" title="ポーランド語: Gołe oko" lang="pl" hreflang="pl" data-title="Gołe oko" data-language-autonym="Polski" data-language-local-name="ポーランド語" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Ochiul_liber" title="ルーマニア語: Ochiul liber" lang="ro" hreflang="ro" data-title="Ochiul liber" data-language-autonym="Română" data-language-local-name="ルーマニア語" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9D%D0%B5%D0%B2%D0%BE%D0%BE%D1%80%D1%83%D0%B6%D1%91%D0%BD%D0%BD%D1%8B%D0%B9_%D0%B3%D0%BB%D0%B0%D0%B7" title="ロシア語: Невооружённый глаз" lang="ru" hreflang="ru" data-title="Невооружённый глаз" data-language-autonym="Русский" data-language-local-name="ロシア語" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Naked_eye" title="シンプル英語: Naked eye" lang="en-simple" hreflang="en-simple" data-title="Naked eye" data-language-autonym="Simple English" data-language-local-name="シンプル英語" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Blotta_%C3%B6gat" title="スウェーデン語: Blotta ögat" lang="sv" hreflang="sv" data-title="Blotta ögat" data-language-autonym="Svenska" data-language-local-name="スウェーデン語" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9D%D0%B5%D0%BE%D0%B7%D0%B1%D1%80%D0%BE%D1%94%D0%BD%D0%B5_%D0%BE%D0%BA%D0%BE" title="ウクライナ語: Неозброєне око" lang="uk" hreflang="uk" data-title="Неозброєне око" data-language-autonym="Українська" data-language-local-name="ウクライナ語" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/M%E1%BA%AFt_th%C6%B0%E1%BB%9Dng" title="ベトナム語: Mắt thường" lang="vi" hreflang="vi" data-title="Mắt thường" data-language-autonym="Tiếng Việt" data-language-local-name="ベトナム語" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E8%82%89%E7%9C%BC" title="中国語: 肉眼" lang="zh" hreflang="zh" data-title="肉眼" data-language-autonym="中文" data-language-local-name="中国語" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E8%82%89%E7%9C%BC%E8%A7%80%E5%AF%9F" title="広東語: 肉眼觀察" lang="yue" hreflang="yue" data-title="肉眼觀察" data-language-autonym="粵語" data-language-local-name="広東語" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q506254#sitelinks-wikipedia" title="言語間リンクを編集" class="wbc-editpage">リンクを編集</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="名前空間"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/%E8%82%89%E7%9C%BC" title="本文を閲覧 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aria-label="ページツール"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="表示"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">表示</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">非表示</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">出典: フリー百科事典『ウィキペディア（Wikipedia）』</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ja" dir="ltr"><p><b>肉眼</b>（にくがん）とは、<a href="/wiki/%E5%85%89%E5%AD%A6%E6%A9%9F%E5%99%A8" title="光学機器">光学機器</a>を付けずに<a href="/wiki/%E8%A6%B3%E6%B8%AC" title="観測">観測</a>すること。またその行為である。 </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="一般な用法として"><span id=".E4.B8.80.E8.88.AC.E3.81.AA.E7.94.A8.E6.B3.95.E3.81.A8.E3.81.97.E3.81.A6"></span>一般な用法として</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E8%82%89%E7%9C%BC&action=edit&section=1" title="節を編集: 一般な用法として"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>一般的に<b>肉眼</b>というと<a href="/wiki/%E6%9C%9B%E9%81%A0%E9%8F%A1" title="望遠鏡">望遠鏡</a>や<a href="/wiki/%E5%8F%8C%E7%9C%BC%E9%8F%A1" title="双眼鏡">双眼鏡</a>や<a href="/wiki/%E9%A1%95%E5%BE%AE%E9%8F%A1" title="顕微鏡">顕微鏡</a>などを付けずに見ることやその場合の<a href="/wiki/%E8%A6%96%E5%8A%9B" title="視力">視力</a>を指す。また<a href="/wiki/%E7%9C%BC%E9%8F%A1" title="眼鏡">眼鏡</a>をかけての視力の場合は<a href="/wiki/%E7%9F%AF%E6%AD%A3%E8%A6%96%E5%8A%9B" class="mw-redirect" title="矯正視力">矯正視力</a>と言うほうが一般的であり、メガネや<a href="/wiki/%E3%82%B3%E3%83%B3%E3%82%BF%E3%82%AF%E3%83%88%E3%83%AC%E3%83%B3%E3%82%BA" title="コンタクトレンズ">コンタクトレンズ</a>を使用しないことを<b>裸眼</b>（らがん）と呼ぶ。 </p> <div class="mw-heading mw-heading2"><h2 id="肉眼の使用状況の変化"><span id=".E8.82.89.E7.9C.BC.E3.81.AE.E4.BD.BF.E7.94.A8.E7.8A.B6.E6.B3.81.E3.81.AE.E5.A4.89.E5.8C.96"></span>肉眼の使用状況の変化</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E8%82%89%E7%9C%BC&action=edit&section=2" title="節を編集: 肉眼の使用状況の変化"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><i><a href="/wiki/%E8%BF%91%E8%A6%96" title="近視">近視</a>も参照</i> </p><p>近年のめざましい<a href="/wiki/%E6%83%85%E5%A0%B1%E6%8A%80%E8%A1%93" title="情報技術">情報技術</a>進歩の結果、目を酷使することが増え<a href="/wiki/%E3%83%89%E3%83%A9%E3%82%A4%E3%82%A2%E3%82%A4" title="ドライアイ">ドライアイ</a>という目の異状を訴える症状が多く報告されるようになった（なお、テレビを見たり、ゲームをしたり、パソコンの画面を見たりして近視になると思いがちだが<i><a href="/wiki/%E5%81%A5%E5%BA%B7%E3%83%96%E3%83%BC%E3%83%A0" title="健康ブーム">科学的な根拠は一切ない</a></i>）。 </p><p>そのためかゲームの説明書には定期的に目を休ませる旨が書かれるようになった。また最近は目を休ませるための<a href="/wiki/%E5%81%A5%E5%BA%B7%E6%B3%95" title="健康法">健康法</a>が紹介されたり<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>、アイスパッド（いわゆるアイスピロー）が発売されるようになった。 </p> <div class="mw-heading mw-heading2"><h2 id="天文学として"><span id=".E5.A4.A9.E6.96.87.E5.AD.A6.E3.81.A8.E3.81.97.E3.81.A6"></span>天文学として</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E8%82%89%E7%9C%BC&action=edit&section=3" title="節を編集: 天文学として"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/%E5%A4%A9%E6%96%87%E5%AD%A6" title="天文学">天文学</a>では、望遠鏡が発明されるまでは肉眼でしか<a href="/wiki/%E5%A4%A9%E4%BD%93" title="天体">星</a>を観察できなかった。<a href="/wiki/%E6%98%9F%E5%BA%A7" title="星座">星座</a>を用いての視力検査がなされるほどであった。その後望遠鏡の発明により観測可能な星は飛躍的に増え<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>、より暗い星でも観察することができるようになった。 </p><p>なお望遠鏡で見える星の明るさ（<a href="/wiki/%E7%AD%89%E7%B4%9A_(%E5%A4%A9%E6%96%87)" title="等級 (天文)">等級</a>）は口径などによるが355mm口径で15等星まで<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>。一方肉眼では（十分暗いところで）6等星までである。等級が1増える（減る）ごとに明るさは約2.512倍変化するので、355mm口径望遠鏡では最大で肉眼の約4000倍の暗さの星が見えるということになる。（2.512^(15-6)≒3982.69となる） </p> <div class="mw-heading mw-heading2"><h2 id="脚注"><span id=".E8.84.9A.E6.B3.A8"></span>脚注</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E8%82%89%E7%9C%BC&action=edit&section=4" title="節を編集: 脚注"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ol class="references"> <li id="cite_note-1"><b><a href="#cite_ref-1">^</a></b> <span class="reference-text"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20041127041800/http://allabout.co.jp/health/eye/closeup/CU20040930A/index2.htm">All about記事</a></span> </li> <li id="cite_note-2"><b><a href="#cite_ref-2">^</a></b> <span class="reference-text"><a rel="nofollow" class="external text" href="http://web.kyoto-inet.or.jp/people/kusima9m/b/select.html">猪名川天文台（PDF 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