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A healthy retina is necessary for good vision. The eye is composed of light-sensitive cells connected with nerve fibers that allow light entering the eye to be converted to nerve impulses that reach the brain.
A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are very common in older people. By age 80, most people, either have a cataract or have had cataract surgery.A cataract can occur in either or both eyes. It cannot spread from one eye to the other.
'Normal' eye pressure is when the amount of fluid produced is balanced by the amount of fluid draining away. If the fluid in the eye does not balance then the pressure inside the eye becomes raised - chronic glaucoma. Glaucoma, if untreated, causes damage to the optic nerve at the back of the eye, ultimately resulting in loss of vision.
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AMD is a common eye condition and a leading cause of vision loss among people age 50 and older. It causes damage to the macula, a small spot near the center of the retina and the part of the eye needed for sharp, central vision, which lets us see objects that are straight ahead.In some people, AMD advances so slowly that vision loss does not occur for a long time.