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class="content-area"> <main id="main" class="site-main" role="main"> <article id="post-3687" class="entry post-3687 post type-post status-publish format-standard has-post-thumbnail hentry category-controversia category-oftalmologia"> <header class="entry-header"> <div class="entry-meta"> <span class="entry-date"> Jun 11, 2024 </span> </div><!-- .entry-meta --> <h1 class="entry-title">Luz azul y ritmo circadiano: por fin vamos aclarando las cosas</h1> </header><!-- .entry-header --> <div class="entry-thumbnail"> <img width="400" height="243" src="https://ocularis.es/wp-content/uploads/2024/06/article-2335775-1A24D965000005DC-565_634x385.jpg" class="aligncenter wp-post-image" alt="" loading="lazy" srcset="https://ocularis.es/wp-content/uploads/2024/06/article-2335775-1A24D965000005DC-565_634x385.jpg 400w, https://ocularis.es/wp-content/uploads/2024/06/article-2335775-1A24D965000005DC-565_634x385-300x182.jpg 300w" sizes="(max-width: 400px) 100vw, 400px" /> </div> <div class="entry-content"> <p>De forma discreta, se van acumulando las evidencias y artículos generalistas en contra de la moda “científica” de que la luz azul de las pantallas alteraba nuestro sueño.<span class="Apple-converted-space"> </span></p> <p><a href="https://www.wired.com/story/blue-light-smartphone-screen-sleep/">https://www.wired.com/story/blue-light-smartphone-screen-sleep/</a></p> <p>En este artículo de Wired nos viene a decir que la luz azul no parece que juegue el papel que se le atribuía en su momento para hacer que durmiéramos peor, cuando se usan pantallas antes de dormir.</p> <p>Ya me posicioné hace 9 años en contra de esa corriente, defendida incluso por científicos y divulgadores serios. Los estudios<span class="Apple-converted-space">  </span>que sugerían que el problema venía de la luz azul estaban mal diseñados e ignoraban factores de confusión. Como decía en mis artículos hace casi una década, había causas más plausibles que pueden explicar que duermas peor si utilizas intensivamente pantallas antes de dormir.</p> <p><a href="https://ocularis.es/luz-azul-y-ritmo-circadiano-i/">https://ocularis.es/luz-azul-y-ritmo-circadiano-i/</a></p> <p><a href="https://ocularis.es/luz-azul-y-ritmo-circadiano-ii/">https://ocularis.es/luz-azul-y-ritmo-circadiano-ii/</a></p> <p><a href="https://ocularis.es/luz-azul-y-ritmo-circadiano-iii/">https://ocularis.es/luz-azul-y-ritmo-circadiano-iii/</a></p> <p>Es curioso porque, en aquellos años en donde los intereses comerciales demonizaban tanto la luz azul (para vender los filtros de pantallas tipo Reticare y las gafas con filtros), si bien entre los profesionales y científicos (sin conflictos de intereses) teníamos cierto consenso de que la luz no dañaba la retina, no pasaba lo mismo con el ciclo sueño vigilia. O mejor dicho, la mayoría dieron por buena la hipótesis de supresión de la melatonina y su relación con la luz azul. Afirmaban que, si bien la luz azul no daña nuestros ojos, sí nos puede alterar el sueño.<span class="Apple-converted-space"> </span></p> <p>Muchos oftalmólogos, e incluso instituciones como la Agencia Americana de Oftalmología, cayeron en esa trampa.</p> <p>Creo que la causa de ello es:</p> <ul> <li>Neurocientíficos que daban por válidas sus hipótesis sin demostrarlo en humanos. Muchos estudios en ratas y similares. Si en algo nos diferenciamos de otros animales de ese tipo, es en el diferente desarrollo del cerebro.</li> <li>Profesionales de la salud y científicos con poco conocimiento del sistema nervioso en relación con el ritmo circadiano. No se trata de lo poco que sabemos (la melatonina como circuito “sencillo”, que podemos encontrar en animales con un cerebro mucho menos desarrollado), sino de lo mucho que no sabemos pero está ahí: grandes vías nerviosas que llegan al circuitos del ciclo sueño-vigilia, desde la vía visual y otras partes del sistema nervioso, que por ser más complejos no los entendemos. Pero están ahí.</li> <li>No entender el propio ciclo de la melatonina con la luz azul. La melatonina se suprime con la luz azul cuando estamos despiertos y se activa en ausencia de la luz azul cuando dormimos. Es un salto de fe decir que necesitamos menos luz azul cuando todavía estamos despiertos, antes de dormir. Y va en contra del sentido común a nada que pensemos un poco: el entorno nocturno natural tiene un predominio de azules.</li> </ul> <p>En conclusión:<span class="Apple-converted-space"> </span></p> <ul> <li>No quiere decir que usar compulsivamente pantallas antes de dormir sea inocuo para nuestra calidad de sueño. Más bien al contrario. Pero hay otras causas, como dice el artículo enlazado al principio, y sugería en los antiguos posts de mi blog.<span class="Apple-converted-space"> </span></li> <li>Los detalles son importantes, porque filtrar el azul no te va a ayudar. Al contrario: si piensas que con el filtro es suficiente, no vas a hacer lo correcto para mejorar tu sueño, que es cambiar de actividad con la pantalla, o disminuir su uso.</li> <li>Lo que dice la ciencia no es lo que dicen los científicos ni los divulgadores. Entonces, si uno no tiene la formación y los conocimientos para avaluar las evidencias científicas, ¿qué hacer? Es difícil ofrecer una solución, saber de quién fiarse. Este tipo de noticias; cuando, años después, se demuestra falsa una “moda científica” que causo furor en su momento, están bien “tirar de hemeroteca” y saber qué científicos/periodistas/divulgadores las daban por buenas y quiénes eran escépticos. Eso puede ayudar para saber de quién te fías en el futuro.</li> </ul> <!-- Simple Share Buttons Adder (8.2.6) simplesharebuttons.com --><div class="ssba-classic-2 ssba ssbp-wrap left ssbp--theme-1"><div style="text-align:left"><span class="ssba-share-text">Comparte el artículo </span><a data-site="" class="ssba_twitter_share" href="http://twitter.com/share?url=https://ocularis.es/luz-azul-y-ritmo-circadiano-por-fin-vamos-aclarando-las-cosas/&amp;text=Luz%20azul%20y%20ritmo%20circadiano%3A%20por%20fin%20vamos%20aclarando%20las%20cosas%20" target=&quot;_blank&quot; ><img src="https://ocularis.es/wp-content/plugins/simple-share-buttons-adder/buttons/somacro/twitter.png" style="width: 45px;" title="Twitter" class="ssba ssba-img" alt="Tweet about this on Twitter" /><div title="Twitter" class="ssbp-text">Twitter</div></a><a data-site="" class="ssba_facebook_share" href="http://www.facebook.com/sharer.php?u=https://ocularis.es/luz-azul-y-ritmo-circadiano-por-fin-vamos-aclarando-las-cosas/" 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<option value='https://ocularis.es/2017/05/'> mayo 2017 &nbsp;(3)</option> <option value='https://ocularis.es/2017/04/'> abril 2017 &nbsp;(2)</option> <option value='https://ocularis.es/2017/03/'> marzo 2017 &nbsp;(1)</option> <option value='https://ocularis.es/2017/02/'> febrero 2017 &nbsp;(3)</option> <option value='https://ocularis.es/2017/01/'> enero 2017 &nbsp;(5)</option> <option value='https://ocularis.es/2016/12/'> diciembre 2016 &nbsp;(1)</option> <option value='https://ocularis.es/2016/02/'> febrero 2016 &nbsp;(2)</option> <option value='https://ocularis.es/2016/01/'> enero 2016 &nbsp;(1)</option> <option value='https://ocularis.es/2015/12/'> diciembre 2015 &nbsp;(1)</option> <option value='https://ocularis.es/2015/09/'> septiembre 2015 &nbsp;(1)</option> <option value='https://ocularis.es/2015/08/'> agosto 2015 &nbsp;(2)</option> <option value='https://ocularis.es/2015/07/'> julio 2015 &nbsp;(1)</option> <option value='https://ocularis.es/2015/03/'> marzo 2015 &nbsp;(1)</option> <option value='https://ocularis.es/2015/02/'> febrero 2015 &nbsp;(2)</option> <option value='https://ocularis.es/2015/01/'> enero 2015 &nbsp;(1)</option> <option value='https://ocularis.es/2014/12/'> diciembre 2014 &nbsp;(1)</option> <option value='https://ocularis.es/2014/10/'> octubre 2014 &nbsp;(2)</option> <option value='https://ocularis.es/2014/09/'> septiembre 2014 &nbsp;(2)</option> <option value='https://ocularis.es/2014/08/'> agosto 2014 &nbsp;(1)</option> <option value='https://ocularis.es/2014/05/'> mayo 2014 &nbsp;(1)</option> <option value='https://ocularis.es/2014/04/'> abril 2014 &nbsp;(1)</option> <option value='https://ocularis.es/2014/03/'> marzo 2014 &nbsp;(1)</option> <option value='https://ocularis.es/2014/02/'> febrero 2014 &nbsp;(2)</option> <option value='https://ocularis.es/2014/01/'> enero 2014 &nbsp;(3)</option> <option value='https://ocularis.es/2013/12/'> diciembre 2013 &nbsp;(6)</option> <option value='https://ocularis.es/2013/11/'> noviembre 2013 &nbsp;(1)</option> <option value='https://ocularis.es/2013/10/'> octubre 2013 &nbsp;(1)</option> <option value='https://ocularis.es/2013/09/'> septiembre 2013 &nbsp;(1)</option> <option value='https://ocularis.es/2013/08/'> agosto 2013 &nbsp;(2)</option> <option value='https://ocularis.es/2013/07/'> julio 2013 &nbsp;(2)</option> <option value='https://ocularis.es/2013/06/'> junio 2013 &nbsp;(1)</option> <option value='https://ocularis.es/2013/05/'> mayo 2013 &nbsp;(1)</option> <option value='https://ocularis.es/2013/04/'> abril 2013 &nbsp;(1)</option> <option value='https://ocularis.es/2013/03/'> marzo 2013 &nbsp;(1)</option> <option value='https://ocularis.es/2013/02/'> febrero 2013 &nbsp;(2)</option> <option value='https://ocularis.es/2013/01/'> enero 2013 &nbsp;(3)</option> <option value='https://ocularis.es/2012/12/'> diciembre 2012 &nbsp;(2)</option> <option value='https://ocularis.es/2012/11/'> noviembre 2012 &nbsp;(1)</option> <option 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<option value='https://ocularis.es/2011/09/'> septiembre 2011 &nbsp;(2)</option> <option value='https://ocularis.es/2011/08/'> agosto 2011 &nbsp;(2)</option> <option value='https://ocularis.es/2011/07/'> julio 2011 &nbsp;(4)</option> <option value='https://ocularis.es/2011/06/'> junio 2011 &nbsp;(1)</option> <option value='https://ocularis.es/2011/05/'> mayo 2011 &nbsp;(3)</option> <option value='https://ocularis.es/2011/04/'> abril 2011 &nbsp;(1)</option> <option value='https://ocularis.es/2011/03/'> marzo 2011 &nbsp;(3)</option> <option value='https://ocularis.es/2011/02/'> febrero 2011 &nbsp;(2)</option> <option value='https://ocularis.es/2011/01/'> enero 2011 &nbsp;(3)</option> <option value='https://ocularis.es/2010/12/'> diciembre 2010 &nbsp;(2)</option> <option value='https://ocularis.es/2010/11/'> noviembre 2010 &nbsp;(3)</option> <option value='https://ocularis.es/2010/10/'> octubre 2010 &nbsp;(2)</option> <option value='https://ocularis.es/2010/09/'> septiembre 2010 &nbsp;(5)</option> <option value='https://ocularis.es/2010/08/'> agosto 2010 &nbsp;(5)</option> <option value='https://ocularis.es/2010/07/'> julio 2010 &nbsp;(4)</option> <option value='https://ocularis.es/2010/06/'> junio 2010 &nbsp;(4)</option> <option value='https://ocularis.es/2010/05/'> mayo 2010 &nbsp;(1)</option> <option value='https://ocularis.es/2010/04/'> abril 2010 &nbsp;(3)</option> <option value='https://ocularis.es/2010/03/'> marzo 2010 &nbsp;(3)</option> <option value='https://ocularis.es/2010/02/'> febrero 2010 &nbsp;(6)</option> <option value='https://ocularis.es/2010/01/'> enero 2010 &nbsp;(5)</option> <option value='https://ocularis.es/2009/12/'> diciembre 2009 &nbsp;(4)</option> <option value='https://ocularis.es/2009/11/'> noviembre 2009 &nbsp;(3)</option> <option value='https://ocularis.es/2009/10/'> octubre 2009 &nbsp;(4)</option> <option value='https://ocularis.es/2009/09/'> septiembre 2009 &nbsp;(4)</option> <option value='https://ocularis.es/2009/08/'> agosto 2009 &nbsp;(2)</option> <option value='https://ocularis.es/2009/07/'> julio 2009 &nbsp;(3)</option> <option value='https://ocularis.es/2009/06/'> junio 2009 &nbsp;(5)</option> <option value='https://ocularis.es/2009/05/'> mayo 2009 &nbsp;(3)</option> <option value='https://ocularis.es/2009/04/'> abril 2009 &nbsp;(3)</option> <option value='https://ocularis.es/2009/03/'> marzo 2009 &nbsp;(2)</option> <option value='https://ocularis.es/2009/02/'> febrero 2009 &nbsp;(2)</option> <option value='https://ocularis.es/2009/01/'> enero 2009 &nbsp;(3)</option> <option value='https://ocularis.es/2008/12/'> diciembre 2008 &nbsp;(3)</option> <option value='https://ocularis.es/2008/11/'> noviembre 2008 &nbsp;(4)</option> <option value='https://ocularis.es/2008/10/'> octubre 2008 &nbsp;(3)</option> <option value='https://ocularis.es/2008/09/'> septiembre 2008 &nbsp;(1)</option> <option value='https://ocularis.es/2008/08/'> agosto 2008 &nbsp;(6)</option> <option value='https://ocularis.es/2008/07/'> julio 2008 &nbsp;(1)</option> <option value='https://ocularis.es/2008/06/'> junio 2008 &nbsp;(4)</option> <option value='https://ocularis.es/2008/05/'> mayo 2008 &nbsp;(4)</option> <option value='https://ocularis.es/2008/04/'> abril 2008 &nbsp;(2)</option> <option value='https://ocularis.es/2008/03/'> marzo 2008 &nbsp;(6)</option> <option value='https://ocularis.es/2008/02/'> febrero 2008 &nbsp;(3)</option> <option value='https://ocularis.es/2008/01/'> enero 2008 &nbsp;(4)</option> <option value='https://ocularis.es/2007/12/'> diciembre 2007 &nbsp;(5)</option> <option value='https://ocularis.es/2007/11/'> noviembre 2007 &nbsp;(5)</option> <option value='https://ocularis.es/2007/10/'> octubre 2007 &nbsp;(3)</option> <option value='https://ocularis.es/2007/09/'> septiembre 2007 &nbsp;(3)</option> <option value='https://ocularis.es/2007/08/'> agosto 2007 &nbsp;(3)</option> <option value='https://ocularis.es/2007/07/'> julio 2007 &nbsp;(3)</option> <option value='https://ocularis.es/2007/06/'> junio 2007 &nbsp;(4)</option> <option value='https://ocularis.es/2007/05/'> mayo 2007 &nbsp;(4)</option> <option value='https://ocularis.es/2007/04/'> abril 2007 &nbsp;(3)</option> <option value='https://ocularis.es/2007/03/'> marzo 2007 &nbsp;(3)</option> <option value='https://ocularis.es/2007/02/'> febrero 2007 &nbsp;(4)</option> <option value='https://ocularis.es/2007/01/'> enero 2007 &nbsp;(8)</option> <option value='https://ocularis.es/2006/12/'> diciembre 2006 &nbsp;(8)</option> <option value='https://ocularis.es/2006/11/'> noviembre 2006 &nbsp;(4)</option> <option value='https://ocularis.es/2006/10/'> octubre 2006 &nbsp;(7)</option> <option value='https://ocularis.es/2006/09/'> septiembre 2006 &nbsp;(3)</option> <option value='https://ocularis.es/2006/08/'> agosto 2006 &nbsp;(4)</option> <option value='https://ocularis.es/2006/07/'> julio 2006 &nbsp;(2)</option> <option value='https://ocularis.es/2006/06/'> junio 2006 &nbsp;(3)</option> <option value='https://ocularis.es/2006/05/'> mayo 2006 &nbsp;(4)</option> <option value='https://ocularis.es/2006/04/'> abril 2006 &nbsp;(5)</option> <option value='https://ocularis.es/2006/03/'> marzo 2006 &nbsp;(5)</option> <option value='https://ocularis.es/2006/02/'> febrero 2006 &nbsp;(5)</option> <option value='https://ocularis.es/2006/01/'> enero 2006 &nbsp;(2)</option> <option value='https://ocularis.es/2005/12/'> diciembre 2005 &nbsp;(7)</option> <option value='https://ocularis.es/2005/11/'> noviembre 2005 &nbsp;(4)</option> <option value='https://ocularis.es/2005/10/'> octubre 2005 &nbsp;(4)</option> <option value='https://ocularis.es/2005/09/'> septiembre 2005 &nbsp;(4)</option> <option value='https://ocularis.es/2005/08/'> agosto 2005 &nbsp;(3)</option> </select> <script type="text/javascript"> /* <![CDATA[ */ (function() { var dropdown = document.getElementById( "archives-dropdown-3" ); function onSelectChange() { if ( dropdown.options[ dropdown.selectedIndex ].value !== 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