Coupon Accepted Successfully!



  • The ability of the eye to focus both near and distant objects, by adjusting its focal length, is called the accommodation of the eye.
  • The smallest distance, at which the eye can see objects clearly without strain, is called the near point of the eye or the least distance of distinct vision. For a young adult with normal vision, it is about 25 cm.
  • The common refractive defects of vision include myopia, hypermetropia and presbyopia.
  • For Myopia (short-sightedness),the image of distant objects is focused before the retina and is corrected by using a concave lens of suitable power.
  • In Hypermetropia (far-sightedness),the image of nearby objects is focussed beyond the retina and is corrected by using a convex lens of suitable power.
  • The eye loses its power of accommodation at old age.
  • The splitting of white light into its constituent colours is called dispersion.
  • Scattering of light causes the blue colour of sky and the reddening of the Sun at sunrise and sunset.

Test Your Skills Now!
Take a Quiz now
Reviewer Name