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A cataract can be described simply as an opaque spot on the lens of the eye through which you cannot see. The lens becomes clouded. The degree of opacity depends on how developed the cataract is. At best, you seem to be looking through a cloud or a haze. As this haze can vary in size, density, and location, its effect on vision will vary.
Many people experience a general reduction in vision at first; they need more light to read by, or they have difficulty with street signs when driving. A cataract also can affect depth perception. This is a particular danger to older people, who are at greatest risk for injury from falls and accidents.