Q.

Myopia is due to which of the following reasons?


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a

Elongation of eye ball           

b

Irregular change in focal length           

c

Shortening of eye ball           

d

Older age 

answer is A.

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Detailed Solution

Myopia is due to elongation of eye ball.
Myopia is the term used to define short-sightedness. Light from a distant object forms an image before it reaches the retina of the eye. This is because the eyeball is large, or the cornea or crystalline lens is too strong. This results in a decrease in the focal length of the eye lens, while the distance between the retina and the lens is always constant.
 
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