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this defect is known as myopia or it is also known by the name called nearsightedness.
two main reasons for it are:
1. it is because of the increase in the size of the eye ball.
2. or increase in the refractive power.
concave lenses are used for this defect
two main reasons for it are:
1. it is because of the increase in the size of the eye ball.
2. or increase in the refractive power.
concave lenses are used for this defect
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