{"id":326,"date":"2013-06-03T14:17:38","date_gmt":"2013-06-03T14:17:38","guid":{"rendered":"http:\/\/www.blog-thebrain.org\/?p=621"},"modified":"2022-01-04T19:49:16","modified_gmt":"2022-01-04T19:49:16","slug":"seeing-whats-in-your-eye","status":"publish","type":"post","link":"https:\/\/www.blog-thebrain.org\/beginner\/2013\/06\/03\/seeing-whats-in-your-eye\/","title":{"rendered":"Seeing What\u2019s in Your Eye"},"content":{"rendered":"

\"\"<\/p>\n

The structure of your eye<\/span><\/a><\/span> is a lot like that of a traditional film camera. The lens of your eye is like the camera\u2019s lens. Your iris is like the diaphragm, and your retina<\/span><\/a><\/span>, at the very back of the eye, acts like the light-sensitive film.<\/p>\n

However, there is a hole in your retina that lets the axons of its ganglion cells<\/span><\/a><\/span> (a kind of neuron) exit the eye while letting blood vessels enter to irrigate all of the retina\u2019s neurons. This hole creates a true \u201cblind spot\u201d<\/span><\/a><\/span> in your field of vision. You don\u2019t notice this blind spot in your daily life. But, as explained in the first video to which I provide a link below, if you close one eye and use the other to look at a target a certain distance away, you\u2019ll see this part of your field of vision literally disappear.<\/p>\n

You also don\u2019t notice the many blood vessels<\/span><\/a><\/span> that lie between your retina and the outside world. The reason is a phenomenon called neuronal adaptation, which is also explained very well in the same video. This video shows a simple trick that you can use to \u201cdefeat\u201d this adaptation and see the blood vessels in your own eye.\u00a0If you\u2019re like me, you may get somewhat emotional the first time you see these helpful friends who have been hiding right before your very eyes ever since you were born.<\/p>\n

The second video to which I provide a link below, by the same author, is even more amazing, because in this one, he shows a trick that lets you actually see the white blood cells in the blood vessels of your eyes. These cells are so tiny that they are invisible to the naked eye, but if you look up at a clear blue sky, you\u2019ll have a good chance of detecting them, in the form of tiny points of light. The explanation involves the absorption of the wave length of blue light by your eye\u2019s red blood cells. Once again the video\u2019s author provides a very clear explanation by drawing on a white board, this time in a speeded-up fashion reminiscent of the RSA Animate<\/a> series of knowledge-visualization videos.<\/p>\n

\"i_lien\" Why we have blind spots – and how to see the blood vessels inside your own eye!<\/span><\/a>
\n\"i_lien\" How to see white blood cells in your eye – the Blue Field Entoptic Phenomenon<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The structure of your eye is a lot like that of a traditional film camera. The lens of your eye is like the camera\u2019s lens. Your iris is like the diaphragm, and your retina, at the very back of the eye, acts like the light-sensitive film. However, there is a hole in your retina that […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[9],"tags":[157,158,92,46],"_links":{"self":[{"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/posts\/326"}],"collection":[{"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/comments?post=326"}],"version-history":[{"count":5,"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/posts\/326\/revisions"}],"predecessor-version":[{"id":1016,"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/posts\/326\/revisions\/1016"}],"wp:attachment":[{"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/media?parent=326"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/categories?post=326"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.blog-thebrain.org\/beginner\/wp-json\/wp\/v2\/tags?post=326"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}