which eye defect can be corrected by using 'bi-focal lens' consisting of both concave and convex lens
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The Presbyopia is a condition of the eye that can be the reason why you may need the bi-focal lens.
The disease is practically a problem of long-sightedness in your eyes, that is caused by the very loss of elasticity.
This happens to the lens of the eye.
It often happens in old age.
The disease is practically a problem of long-sightedness in your eyes, that is caused by the very loss of elasticity.
This happens to the lens of the eye.
It often happens in old age.
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