1.

When do we consider a person to be myopic or hypermetropic? Explain how the defects associated with the myopic and hypermetropic eye can be corrected?

Answer»
  • When a person cannot see the distant objects clearly he is said to be myopic. 
  • Myopia is a condition where image is formed in front of retina. 
  • When a person cannot see the nearer objects clearly he is said to be hypermetropic. 
  • Hypermetropia is a condition where image is formed behind the retina.

Correction of Myopia 

  • Myopia can be corrected by using a concave lens of suitable power. 
  • A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.

 Correction of Hypermetropia

  • Hypermetropia can be corrected by using a convex lens of suitable power.
  • Eye-glasses with converging lenses provide the additional focussing power required for forming the image on the retina.


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