PSL300H1 Study Guide - Final Guide: Presbyopia, Anterior Chamber Of Eyeball, Sclera
7 Jan 2017
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Document Summary
Smooth muscles in the iris control pupil size via dilation and constriction. In bright light, parasympathetic signals contract pupillary constrictor muscle, shrinking the pupil. In the dark, sympathetic signals contract the radial pupillary dilator muscle of the iris, dilating the pupil. Pupil one of the main mechanisms to focus light on retina, and involved in depth of field: depth of field. Refraction other mechanism of focusing light on the retina: cornea most of the refraction (2/3rd) Lens has the ability to change its shape, thus can alter refraction of light (focusing on distance and near objects) The eye is divided into two chambers by the lens. The eye is divided into two chambers by the lens (transparent disk that focuses light) Lens is suspended by zonules (ligaments) run all the way around the lens (like trampoline) In front of lens is anterior chamber, filled with aqueous humor plasma-like.
