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A cataract is an eye condition in which the lens of the eye becomes progressively opaque. There are many causes of cataract including aging, trauma and other diseases.
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Macular degeneration is a degenerative condition affecting the central part of the retina (the macula) resulting in distortion or loss of the central vision. It occurs especially in older adults in which case it is called age related macular degeneration
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Glaucoma is a type of damage of the optic nerve which can cause visual loss. There is often increased pressure inside the eyeball.
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