BIOC32H3 Lecture Notes - Lecture 16: Ciliary Muscle, Zonule Of Zinn, Retina

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9 Jan 2015
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Eye = hollow sphere divided into two compartments: aqueous humor and vitreous humor. Two compartments = separated by the lens; the lens and cornea focus light on the retina. Ciliary muscles and zonules (ligaments) control bending of the lens. Retina = sensory wall and contains blood vessels, photoreceptors, optic disk, and fovea. *note: the fovea is the area of highest visual sharpness while the optic disk is the blindspot. Pathway to vision: light enters cornea, pupil controls amount of light allowed to enter; Light converges onto retina at the focal point. Distance from centre of lens to the focal point focal length; for focal length to change, the lens must change shape. Ciliary muscles and zonules (ligaments) muscles contract and relax to round and flatten the lens to accommodate the rays to hit the retina. Ciliary muscles must contract, zonules must loosen, lens must round. Rounding of lens shortens focal length to hit the retina.

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