{"id":594,"date":"2016-02-08T15:25:47","date_gmt":"2016-02-08T15:25:47","guid":{"rendered":"http:\/\/uni.hi.is\/scampana\/?page_id=594"},"modified":"2016-10-24T11:31:00","modified_gmt":"2016-10-24T11:31:00","slug":"eyes","status":"publish","type":"page","link":"https:\/\/uni.hi.is\/scampana\/sharks\/shark-anatomy\/eyes\/","title":{"rendered":"Eyes"},"content":{"rendered":"<div class=\"container col-md-12\">\n<p>Sharks posses the basic eye structure that is found in all vertebrates, but with some modification. The shark eye has a reflecting layer called a tapetum lucidum located behind the retina. Essentially the structure consists of a layer of parallel, plate-like cells filled with silver guanine crystals. The crystals reflect light that has already passed through the retina and redirects it back to restimulate the retina as it passes out through the eye. This effectively boosts the visual signal, especially in low light levels giving sharks high visual acuity.<\/p>\n<p>Another modification found in some sharks is the presence of a nictitating membrane. This structure is a denticle covered membrane that protects the eye. It closes when the shark passes close to objects and also during biting or feeding.<\/p>\n<div class=\"col-md-6\">\n<figure class=\"thumbnail col-md-12 col-sm-12\"><a id=\"wb-lbx-id-0\" class=\"wb-lbx mrgn-bttm-0 wb-lbx-inited\" title=\"Figure 1 : The nictitating membrane can be seen on this example of a blue shark.\" href=\"http:\/\/www.bio.gc.ca\/sharks\/anatomy-anatomie\/images\/eyes-1-eng.jpg\"> <\/a><\/p>\n<div id=\"attachment_1047\" style=\"width: 370px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/uni.hi.is\/scampana\/files\/2016\/10\/eyes-1-eng.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1047\" class=\"size-full wp-image-1047\" src=\"http:\/\/uni.hi.is\/scampana\/files\/2016\/10\/eyes-1-eng.jpg\" alt=\"The nictitating membrane can be seen on this example of a blue shark\" width=\"360\" height=\"241\" srcset=\"https:\/\/uni.hi.is\/scampana\/files\/2016\/10\/eyes-1-eng.jpg 360w, https:\/\/uni.hi.is\/scampana\/files\/2016\/10\/eyes-1-eng-300x201.jpg 300w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><p id=\"caption-attachment-1047\" class=\"wp-caption-text\">The nictitating membrane can be seen on this example of a blue shark<\/p><\/div>\n<\/figure>\n<\/div>\n<div class=\"col-md-6\">\n<figure class=\"thumbnail col-md-12 col-sm-12\"><a id=\"wb-lbx-id-1\" class=\"wb-lbx mrgn-bttm-0 wb-lbx-inited\" title=\"Figure 2 : Here is another example of the nictitating membrane in use as a blue shark feeds on some bait (cod). You can see that the eye is completely covered by the membrane as the shark bites.\" href=\"http:\/\/www.bio.gc.ca\/sharks\/anatomy-anatomie\/images\/eyes-2-eng.jpg\"> <\/a><\/p>\n<div id=\"attachment_1000\" style=\"width: 607px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/uni.hi.is\/scampana\/files\/2016\/10\/blue-attacking-cod-3.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1000\" class=\"size-full wp-image-1000\" src=\"http:\/\/uni.hi.is\/scampana\/files\/2016\/10\/blue-attacking-cod-3.jpg\" alt=\"Here is another example of the nictitating membrane in use as a blue shark feeds on some bait (cod). You can see that the eye is completely covered by the membrane as the shark bites\" width=\"597\" height=\"407\" srcset=\"https:\/\/uni.hi.is\/scampana\/files\/2016\/10\/blue-attacking-cod-3.jpg 597w, https:\/\/uni.hi.is\/scampana\/files\/2016\/10\/blue-attacking-cod-3-300x205.jpg 300w\" sizes=\"auto, (max-width: 597px) 100vw, 597px\" \/><\/a><p id=\"caption-attachment-1000\" class=\"wp-caption-text\">Here is another example of the nictitating membrane in use as a blue shark feeds on some bait (cod). You can see that the eye is completely covered by the membrane as the shark bites<\/p><\/div>\n<\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sharks posses the basic eye structure that is found in all vertebrates, but with some modification. The shark eye has a reflecting layer called a tapetum lucidum located behind the retina. Essentially the structure consists of a layer of parallel, plate-like cells filled with silver guanine crystals. The crystals reflect light that has already passed [&hellip;]<\/p>\n","protected":false},"author":1404,"featured_media":0,"parent":585,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-594","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/pages\/594","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/users\/1404"}],"replies":[{"embeddable":true,"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/comments?post=594"}],"version-history":[{"count":7,"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/pages\/594\/revisions"}],"predecessor-version":[{"id":1247,"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/pages\/594\/revisions\/1247"}],"up":[{"embeddable":true,"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/pages\/585"}],"wp:attachment":[{"href":"https:\/\/uni.hi.is\/scampana\/wp-json\/wp\/v2\/media?parent=594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}