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Low vision is a condition that involves a minimal ability to see (particularly central vision) that is unresolved or uncorrected with traditional eyeglasses, contact lens, intraocular lens implants, or corrective surgery. However, in some cases, persons with low vision may be aided with special visual devices.
There are a variety of different causes of low vision, including, but not limited to, the following:
Although, in most cases, persons with low vision have disabled central vision (also called reading vision), there are other types of low vision which may include the following:
Because low vision cannot be improved by more traditional methods (i.e., the use of eyeglasses, contact lenses, etc.) persons with low vision often rely on the use of a number of different instruments, called low-vision devices, and tailored equipment for improved vision. Low-vision devices, categorized as either optical or nonoptical, help to improve visual ability for millions of people every day.
Simply stated, optical low-vision devices involve the use of one of many types of lenses to improve vision. For example:
Nonoptical low-vision devices help bring images closer to the eyes. This may include the use of any, or all, of the following: