Vision 1 - VISION 1 1 Structure of the eye and organization...

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VISION 1 1. Structure of the eye and organization of the visual pathways reading: Chapter 8, The Visual System, pp. 123-138
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Structure of the Eye Cornea (transparent cover of the front of the eye) Sclera (white cover over rest of eyeball) Iris: muscle that contracts or relaxes to control the amount of light entering the eye Lens: located behind the iris, focuses light on the retina. Choroid: layer of blood vessels between the retina and sclera Conjunctiva: membrane covering sclera- if infected or inflamed conjunctivitis (pink eye). Retina: visual neurons Optic nerve: axons leaving retina
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THE LENS Lens in the young is very flexible, can change shape to help focus near and far objects. With age, there is a loss of flexibility of the lens which produces difficulty in focusing on close objects. Generally occurs at around age 45: presbyopia. Another age-related change in the lens is cataracts: lens becomes opaque and cloudy. Cataracts are now easily corrected by surgical removal and replacement with an artificial lens (IOL, intraocular lens). cataract
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Interior of the eyeball is divided into 2 chambers that are fluid filled, maintain shape and intraocular pressure.
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