Far Sightedness Hypermetropia


 
 
Concept Explanation
 

Far Sightedness Hypermetropia

Far-sightedness (Hypermetropia): Some people cannot see nearby objects clearly, although they can see distant objects clearly. This defect is called far-sightedness, long- sightedness, hypermetropia or hyperopia. It arises mainly due to two reason

  • In some people, the eyeball becomes shorter than the normal. As a result, the distance of the retina from the crystalline lens decreases. The image of a nearby object is formed behind the retina. Thus, nearby objects cannot be seen clearly.
  • This defect can also occur if the eye-lens has a focal length that is larger than the normal due to abnormal curvatures of the cornea.
  • People suffering from far-sightedness have difficulty in reading a book or a newspaper, or viewing a small object placed close to the normal near point, N (at 25 cm). People suffering from far-sightedness have to keep reading material or an object much farther away to see clearly.

    Sample Questions
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    Question : 1

    A person cannot see objects clearly which are nearer than 75cms from his eyes, the disease he is suffering from is _________________.

    Right Option : C
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    Question : 2

    Which of the following are correct :

    (a) In farsightedness, people cannot see far objects clearly, although they can see nearby objects clearly.

    (b) In farsightedness, people cannot see nearby objects clearly, although they can see distant objects clearly.

    Right Option : B
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    Question : 3

    A man wearing glasses of focal length +1m cannot clearly see beyond one meter, then we can say _________________.

    Right Option : A
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