explain prebyopia .
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Explanation:
Presbyopia is a normal part of the aging process. It occurs due to hardening of the lens of the eye, causing the eye to focus light behind rather than on the retina when looking at close objects. It is a type of refractive error along with nearsightedness, farsightedness, and astigmatism.
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Long sightedness by loss of elasticity in lens of eyes happening in middle and old age
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