Visual impairment varies in intensity and type from "summary" of The Mind's Eye by Oliver Sacks
Visual impairment, I have found, is not a uniform entity - it varies in intensity and type. Some people are born blind, others lose their sight later in life; some lose central vision, others peripheral vision; some see only in black and white, while others see in vivid color. There are those who have problems with depth perception, or with recognizing faces, or with reading, or with motion. There are those who have "associative agnosias," who can see perfectly well but cannot recognize what they see. The intensity of visual impairment can also vary greatly - some people are only slightly impaired, able to function quite well with the help of glasses or contact lenses, while others are severely impaired, legally blind, or even totally blind. And the type of impairment can be equally diverse - from macular degeneration to glaucoma to cataracts to retinitis pigmentosa to diabetic retinopathy to congenital disorders. Given this variability, it is e...
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