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Question

Sometimes, a person suffers from both the defects, myopia and hypermetropia. Which of the following is used to correct this defect?
  1. Convex lens
  2. Concave lens
  3. Bifocal lens
  4. Cylindrical lens

A
Concave lens
B
Cylindrical lens
C
Convex lens
D
Bifocal lens
Solution
Verified by Toppr

Biofocal lenses are used to correct the defect when person suffers from both the defects of vision myopia and hypermetropia.
A biofocal lens has upper portion made of concave lens and lower portion of convex lens with appropriate curvature/ focal length/ power.
The upper portion of the lens facilitates distant vision and lower portion helps in near vision.

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