A myopic person has been using spectacles of power for distant vision. During old age he also needs to use separate reading glass of power + 2.0 dioptres. Explain what may have happened.
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He might be suffering from presbyopia (hypermetropiadue to old age).
Hope it helps.
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Answer:
During old age, bifocal lens is required.
Explanation:
A myopic person suffers from short sightedness i.e he cannot see objects on large distance. Myopic person needs negative dioptre power to correct the defect. Power of lens is expressed in dioptre. After the age of 40 years, he use both positive and negative power glass because after 40, size of eyeball get reduced and people cannot see nearby objects also. So to correct it, positive dioptre power is used.
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