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An old person is unable to see clearly nearby object as well as distant objects : 

(i) What defect of vision is he suffering from ? 

(ii) What kind of lens will be required to see clearly the nearby as well as distant objects ? Give reason.

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(i) Presbyopia.

(ii) He shall have to use both kinds of lenses. Convex lens for long sightedness and a concave lens for short-sightedness.

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