{"id":37,"date":"2022-01-18T16:34:13","date_gmt":"2022-01-18T21:34:13","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/chapter\/the-eye\/"},"modified":"2022-09-14T15:56:54","modified_gmt":"2022-09-14T19:56:54","slug":"the-eye","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/chapter\/the-eye\/","title":{"raw":"The Eye","rendered":"The Eye"},"content":{"raw":"\nThe human eye is the organ that evolved to convert visible wavelengths of electromagnetic radiation into electrical impulses that our brains can interpret.\n\nThe <strong>iris<\/strong> (coloured portion of the eye) acts as a diaphragm to expand or contract the <strong>pupil<\/strong> (the dark center of the eye). This determines the amount of light that is allowed to enter the eye through the transparent outer membrane, called the <strong>cornea,<\/strong> before passing through the focusing <strong>lens<\/strong> to strike the<strong> retina.<\/strong>\n\nThe <strong>retina<\/strong> is the light-sensitive collection of specialized cells at the back of the eye. A delicate film of nerve fibres branch out from these light-sensitive cells to the optic nerve, and then on to the brain.\n\nThe retina is made of two different types of optic nerve receptors which permit vision: <strong>rods <\/strong>which provide sensitivity to brightness, allowing us to see at low levels of light, and the <strong>cones<\/strong> which allow us to perceive finer details and to distinguish colours.\n\nThe ability and function of the human eye is often compared to an analog camera, in that both use a lens to focus images at various distances onto a light-sensitive surface.\n","rendered":"<p>The human eye is the organ that evolved to convert visible wavelengths of electromagnetic radiation into electrical impulses that our brains can interpret.<\/p>\n<p>The <strong>iris<\/strong> (coloured portion of the eye) acts as a diaphragm to expand or contract the <strong>pupil<\/strong> (the dark center of the eye). This determines the amount of light that is allowed to enter the eye through the transparent outer membrane, called the <strong>cornea,<\/strong> before passing through the focusing <strong>lens<\/strong> to strike the<strong> retina.<\/strong><\/p>\n<p>The <strong>retina<\/strong> is the light-sensitive collection of specialized cells at the back of the eye. A delicate film of nerve fibres branch out from these light-sensitive cells to the optic nerve, and then on to the brain.<\/p>\n<p>The retina is made of two different types of optic nerve receptors which permit vision: <strong>rods <\/strong>which provide sensitivity to brightness, allowing us to see at low levels of light, and the <strong>cones<\/strong> which allow us to perceive finer details and to distinguish colours.<\/p>\n<p>The ability and function of the human eye is often compared to an analog camera, in that both use a lens to focus images at various distances onto a light-sensitive surface.<\/p>\n","protected":false},"author":848,"menu_order":5,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":["alee59"],"pb_section_license":"all-rights-reserved"},"chapter-type":[],"contributor":[61],"license":[59],"class_list":["post-37","chapter","type-chapter","status-publish","hentry","contributor-alee59","license-all-rights-reserved"],"part":29,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/pressbooks\/v2\/chapters\/37","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/wp\/v2\/users\/848"}],"version-history":[{"count":1,"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/pressbooks\/v2\/chapters\/37\/revisions"}],"predecessor-version":[{"id":395,"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/pressbooks\/v2\/chapters\/37\/revisions\/395"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/pressbooks\/v2\/parts\/29"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/pressbooks\/v2\/chapters\/37\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/wp\/v2\/media?parent=37"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/pressbooks\/v2\/chapter-type?post=37"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/wp\/v2\/contributor?post=37"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/basiclightingforelectricianslevel2\/wp-json\/wp\/v2\/license?post=37"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}