What is hypermetropia how can it be corrected
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person with hypermetropia/hyperopia or long sight can see clearly objects far away from them, but not close to them. This is caused by the shape of the eye - the eyeball is slightly too short. It is corrected by spectacles or contact lenses with lenses which are 'plus' or convex in shape.
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HYPERMETROPIA / LONG SIGHTEDNESS :
It is a defect of human eye that the eye can see clearly the far off objects , but the nearby objects cannot be seen clearly.
Hence for a hypermetropia eye , the near point shifts away from the eye. It is no longer at 25 cm.
CAUSES:
- Contraction in the size of eye ball
- Increase in the focal length of the eye lens
CORRECTION:
To correct this defect , the person has to use spectacles with convex lens of suitable focal length .
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