What is astigmatism and how it is corrected

1.	What is astigmatism and how it is corrected
Answer» In this defect,the person cannot distinguish between certain colours. In such a case, the person is said to be colour blind. CORRECTION- Cylindrical lens It is defect of eye in which a patient suffering with astigmatism cannot distinguish between vertical and horizontal planes and it iscorrected by using cylindrical lenses It is defect in which a person cannot see in all the direction equally well

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