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Question

Reduction in elasticity of eye lens with age causes ________.

A
Myopia
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B
Presbyopia
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C
Cataract
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D
Hypermetropia
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Solution

The correct option is C Presbyopia
A. Myopia occurs when eye ball becomes longer and it results in the formation of image in front of retina. It is corrected using concave lens which diverge the light rays to get focussed on the retina.
B. Presbyopia occurs in the late age (generally after 40 years) due to loss of elasticity of eye lens due to which nearby objects are not correctly visible. It is corrected by using bifocal lengths.
C. Cataract is an eye disease that occurs in older people. The visibility is reduced because the eye lens becomes opaque. It is treated by surgery.
D. Hypermetropia occurs when eye ball becomes shorter and it results in the formation of image behind the retina. It is corrected using convex lens which focus the light rays on the retina.
So, the correct answer is 'Presbyopia'.

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