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CBSE Class 10 Answered

SIr/Ma''m
Asked by mehaksaini | 16 May, 2009, 09:49: PM
answered-by-expert Expert Answer

Cylindrical lenses are used to correct Astigmatism in the eye.You must put across your point to  your optometrist incase you feel that you see the horizontal and vertical lines clearly.

The machine that is used to examine the eyes is called a phoropter.

Answered by | 18 May, 2009, 08:38: PM
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