{"id":15807,"date":"2023-07-24T13:19:03","date_gmt":"2023-07-24T13:19:03","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/vision-un-oeil-fait-pour-le-soleil"},"modified":"2023-07-24T13:29:52","modified_gmt":"2023-07-24T13:29:52","slug":"vision-un-oeil-fait-pour-le-soleil","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/vision-un-oeil-fait-pour-le-soleil","title":{"rendered":"Vision\u00a0: un \u0153il fait pour le Soleil"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Djibouti. <\/strong><\/span>Cet article est issu du magazine Les Indispensables de Sciences et Avenir n\u00b0214 date\u0301 juillet\/ septembre 2023.<\/p>\n<p>Notre \u0153il est fantastique. Tapisse\u0301e de photore\u0301cepteurs (co\u0302nes et ba\u0302tonnets), mais aussi de cellules ganglionnaires sensibles a\u0300 l&rsquo;intensite\u0301 de la lumie\u0300re, la re\u0301tine transforme les stimuli lumineux en signaux e\u0301lectriques qu&rsquo;elle envoie a\u0300 notre cerveau&#8230; qui recompose l&rsquo;image des objets vus.<\/p>\n<p><b>\u00ab\u00a0L&rsquo;\u0153il servait surtout a\u0300 capter la lumie\u0300re du Soleil\u00a0\u00bb<\/b><\/p>\n<p>\u00ab\u00a0Mais avant d&rsquo;avoir cette fonction chez les verte\u0301bre\u0301s, l&rsquo;\u0153il servait surtout a\u0300 capter la lumie\u0300re du Soleil, ce qui permettait de re\u0301guler les rythmes circadiens et saisonniers, vitaux pour la survie de l&rsquo;espe\u0300ce\u00a0\u00bb, explique Trevor Lamb, professeur e\u0301me\u0301rite a\u0300 l&rsquo;Universite\u0301 nationale australienne. Les recherches qu&rsquo;il a mene\u0301es sur la vision et son e\u0301volution montrent que l&rsquo;intensite\u0301 de la lumie\u0300re en est toujours l&rsquo;acteur essentiel.<\/p>\n<p><b> Des yeux \u00ab\u00a0came\u0301ra\u00a0\u00bb<\/b><\/p>\n<p>Les ba\u0302tonnets, re\u0301agissant particulie\u0300rement aux faibles luminosite\u0301s, repre\u0301sentent 95 % des quelque 100 millions de nos photore\u0301cepteurs. Moins sensibles, les co\u0302nes nous permettent de voir les couleurs. Ils sont classe\u0301s en trois types : L, M et N, qui captent respectivement le rouge, le vert et le bleu. Les co\u0302nes M e\u0301tant les plus nombreux, notre re\u0301tine perc\u0327oit surtout la lumie\u0300re d&rsquo;une longueur d&rsquo;onde d&rsquo;environ 590 nanome\u0300tres, entre vert et jaune. Normal : c&rsquo;est celle qu&rsquo;e\u0301met majoritairement le Soleil.<\/p>\n<p>La plupart des animaux, posse\u0301dant comme nous des yeux dits \u00ab\u00a0came\u0301ra\u00a0\u00bb, de\u0301tectent le me\u0302me spectre lumineux, toutefois souvent plus e\u0301tendu. Reptiles, oiseaux et insectes disposent d&rsquo;une quatrie\u0300me classe de co\u0302nes, sensible aux ultraviolets, qui jouerait un ro\u0302le important dans les parades nuptiales. Quant aux crotales, ils ont une particularite\u0301 e\u0301tonnante : ils peuvent voir aussi en infrarouge. Un rayonnement qu&rsquo;e\u0301mettent leurs proies du fait de leur chaleur, et qui les distingue de leur environnement plus froid.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/djibouti\">Djibouti<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Djibouti. Cet article est issu du magazine Les Indispensables de Sciences et Avenir n\u00b0214 date\u0301 juillet\/ septembre 2023. Notre \u0153il est fantastique. Tapisse\u0301e de photore\u0301cepteurs (co\u0302nes et ba\u0302tonnets), mais aussi de cellules ganglionnaires sensibles a\u0300 l&rsquo;intensite\u0301 de la lumie\u0300re, la re\u0301tine transforme les stimuli lumineux en signaux e\u0301lectriques qu&rsquo;elle envoie a\u0300 notre cerveau&#8230; [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":15806,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-15807","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Vision\u00a0: un \u0153il fait pour le Soleil - Djibouti<\/title>\n<meta name=\"description\" content=\"Cet article est issu du magazine Les Indispensables de Sciences et Avenir n\u00b0214 date\u0301 juillet\/ septembre 2023. 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