Which of the following defects of eye can be corrected with lenses having different curvatures in two mutually perpendicular directions?

cataract

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Presbyopia

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Hyperopia

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none of these

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Solution

The correct option is B
Presbyopia

Explanation for correct answer.
As one grows old, the nearby and far off objects are not visible to eyes clearly.
It occurs due to the weakening of ciliary muscles. Thus, these are not able to adjust the focal length of the eye lens.
Thus a person needs lenses having different curvatures in two mutually perpendicular directions for better vision.
Explanation for incorrect Options:
(A) Cataract: The growth of a membrane over the eye lens is called a cataract.
(C) Hyperopia: Occurs when only near objects are not visible to the eyes.
Therefore, the correct option is (B).

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Similar questions

Given below is a diagram showing a defect of human eye.

Study it and answer the following questions:

(1) Name the defect shown in figure.

(2) Give two possible reasons for this defect of eye in human being.

(3) Name the type of lens used to correct the eye defect.

(4) Draw a labelled diagram to show how the defect is rectified by using the lens.

Myopic eye defect can be corrected by using convex lens.

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