Name one defect of vision that cannot be corrected by any type of spectacle lens.

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Solution

Cataract cannot be corrected by any type of spectacle lenses. The cataract is a clouding of the lens in the eye leading to a decrease in vision.

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Similar questions

Man A has a defect of vision due to which he cannot see the nearby objects clearly (through he can see the distant objects clearly). On the other hand, man B has a defect of vision due to which he cannot see the distant objects clearly (though he can see the nearby objects clearly). The defect in man A can be corrected by using spectacles containing lenses C whereas the defect in man B can be corrected by using spectacles containing lenses D.
(a) Name the defect of vision in man (i) A and (ii) B.
(b) What type of lenses are (i) C and (ii) D?

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