A person is seeing at a wire net he can only see vertical lines or horizontal lines ? then what is he suffering from and what lens is to be used to correct it.
Asked by Jaysankar Jayasoman Nair | 15th Feb, 2012, 07:06: PM
Astigmatism. And cylindrical lenses are used to cure this deffect.
Answered by | 16th Feb, 2012, 09:01: AM
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