Given is a diagram showing a defect of human eye.
Study it and answer the following question :
Give two possible reasons for this defect of eye in human being.

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Solution

Hypermetropia is also known as far -sightedness. A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. The near point, for the person, is farther away from the normal near point ( $25 c m$ ). Such a person has to keep a reading material much beyond $25 c m$ from the eye for comfortable reading. This is because the light rays from a closeby object are focussed at a point behind the retina.
Hypermetropia arises either because:
(i) the focal length of the eye lens is too long, or
(ii) the eyeball has become too small.

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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.

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