What is presbyopia ? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
What is presbyopia ? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
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Presbyopia is that defect of vision due to which an old person cannot see the nearby objects clearly due to loss of power of accommodation of the eye. Causes: Gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens. It can be corrected by using convex lenses.
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