KNES 259 Lecture Notes - Lecture 16: Retina, Inner Ear, Glossopharyngeal Nerve
11 Sep 2020
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Document Summary
Light rays bend as they pass through the cornea and lens. Cornea: xed structure, it always has the same curve. It provides 80% of refractory index of light passing through eye. Light rays coming from distant focal point, and they are approaching parallel. Light will hit convex lens, then refracted onto centre point on retina. Light ray coming from object far away, they are approaching parallel, so require less bending, and thus lens doesn"t need lots of curvature, hence is atter. Light rays are diverging (or moving away) from each other. To make sure, we are focussing the light on the same spot, we need lens to be more rounded, allowing for higher amount of refraction and convergence of light rays on retina. Closely associated with ciliary muscle that attaches into iris. Contracted state of muscles: ligaments don"t have much tension, resulting in more rounded lens.
