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Question

A person is suffering from both myopia and hypermetropia. (i)What kind of lenses can correct this defect? (ii) How are these lenses prepared?


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Solution

Type of lens to correct the defect:

  • If a person is suffering from hypermetropia and myopia then the person is suggested to wear a Bifocal lens.
  • A concave lens of suitable focal length will correct myopia and a convex lens of suitable focal length will correct hypermetropia.

Preparation of lens:

These lenses are prepared by combining both lenses in such a way that the upper part is the concave lens and the lower part is a convex lens.

Hence, a bifocal lens should be used to correct this defect.


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