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Astigmatism for a human eye can be removed by using an additional:

1. concave lens
2. convex lens
3. cylindrical lens
4. prismatic lens

Correct answer: cylindrical lens

Solution

Astigmatism happens when the eye’s curvature is uneven, so light focuses differently in different meridians. A cylindrical lens provides power in one direction only, correcting that uneven focusing.

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