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Which type of lenses are used to correct Hypermetropia and why?

Which type of lenses are used to correct Hypermetropia and why? Correct Answer Converging lens; because these converge the light rays which otherwise converge behind retina due to the long focal length of the eye lens.

The correct answer is option 1, i.e. Converging lens; because these converge the light rays which otherwise converge behind retina due to large focal length of the eye lens.

  • Converging lenses are used to correct the Hypermetropia eye defect because these converge the light rays which otherwise converge behind retina due to the long focal length of the eye lens.
  • Convex lenses are termed as converging lenses.
  • Hypermetropia arises when either the focal length of the eye lens becomes too long or the eyeball becomes too small.
  • In both conditions, the image formation takes place behind the retina.
  • Hence a convex lens is required to converge light rays on the retina so that image formation takes place on the retina.

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  • Myopia - Diverging lens; because these diverge the light rays and form the image on retina which otherwise would be formed in front of the retina due to the excessive curvature of the eye lens.
  • Presbyopia - Bi-focal lenses; because the power of accommodation of the eye lens has decreased and the person can't see distinctly the nearby and distant objects clearly.
  • Cataract - No spectacles can correct this eye defect, the only remedy available is undergoing surgery.

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