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DEFECTS� OF� EYE

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Near point

  • Near point is the nearest point at which the objects can be seen distinctly.
  • Near point of healthy eye is 25cm.

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Farther point

  • Farther point is the farthest point at which objects can be seen .
  • Farthest point of an healthy eye is infinity.

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Power of accommodation

  • The ability of eye to form image by adjusting the focal length of lens in the eye

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1.Hyper metropia or long-sightedness

  • Able to see far away objects but not near objects
  • Corrected using convex lens.

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2.Myopia or near sightedness

  • Able to see near objects but not the far away objects.
  • Corrected using concave lens.

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3.Presbyopia

  • Seen among elderly people.
  • Near distance greater than 25 cm.
  • Corrected using convex lens of suitable power.

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  • In which cases the image is formed on the retina itself

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Right

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wrong

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  • Myopia is corrected using
  • Concave lens
  • Cylindrical lens
  • Convex lens.

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Right

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wrong

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  • What is the near point of healthy eye ?

25 cm

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  • What is farther point of healthy eye

infinity