Answer :
An educational description when the primary channel of learning is through tactile and auditory means functionally blind.
A person is functionally blind when they have to use so many alternative technologies to perform tasks that are normally performed visually that the patterns of their daily lives change significantly. A cataract is a clouding of the normally clear lens.
For people with cataracts looking through a fogged lens is a bit like looking through ice or a fogged window. Astigmatism is an irregularly shaped cornea or lens that prevents light from being properly focused on the retina, the light-sensitive surface at the back of the eye. The surface of the cornea is shaped more like a soccer ball than a round basketball and the eye cannot focus light rays to a single point.
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