Visual Impairment
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Visual impairment (or vision impairment) is vision loss (of a person) to such a degree as to qualify as an additional support need through a significant limitation of visual perception|visual capability resulting from either disease, Physical trauma|trauma, or congenital or degenerative conditions that cannot be corrected by conventional means, such as refractive correction, medication, or surgery. This functional loss of vision is typically defined to manifest with # best corrected visual acuity of less than 20/60, or significant central field defect, # significant peripheral field defect including homonymous or heteronymous bilateral visual, field defect or generalized contraction or constriction of field, or # reduced peak contrast sensitivity with either of the above conditions. In the United States, the terms partially sighted, low vision, legally blind and totally Blindness|blind are used by schools, colleges, and other educational institutions to describe students with visual...
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