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| Description: Wall of eyeball (three layers) Outer layer Sclera: Protects eyeball Cornea: Focuses light Middle layer Pup/I: Serves as entrance for light Iris: Adjusts diameter of pupil Cil/ary body: lts muscles control the lens shape; its fine fibers hold lens in place Choro/d: lts blood vessels nutritionally support wall cells; its pigments stop light scattering Start of optic nerve: Carries signals to brain Inner layer Retina: Absorbs, transduces light energy Interior of eyeball Lens Focuses light on photoreceptors Aqueous humor Transmits light, maintains fluid pressure Vitreous body Transmits light, supports lens and eyeball
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