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A person is suffering from both defects of vision, myopia and hypermetropia. He should use:
  • a)
    concave lens
  • b)
    no corrective lens
  • c)
    bi-focal lens
  • d)
    convex lens
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A person is suffering from both defects of vision, myopia and hypermet...
3) Bifocal lens:-

it is a type of lens which is used to cure the pres byopia
press by opia is a defect of vision in which old person cannot see near object as well as far objects clearly.
or we can say that in simple ways it is a loose the power of accommodation.
the power of accommodation that is 25 CM.
Community Answer
A person is suffering from both defects of vision, myopia and hypermet...
*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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