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When do we consider a person to be myopic or hypermetropic ? List two causes of hypermetropia. Explain using ray diagrams how the defect associated with hypermetropic eye can be corrected.

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When person is unable to see far away objects clearly or when the far point of eye of person has been shifted from  to a nearer point then we say person is suffering from myopia, and when person is unable to see near by objects clearly or when the near point of eye of person has been shifted from 25 cm to a point away then we say person is suffering from hypermetropia.

Causes of hypermetropia – 

(1)  Increase in focal length of eye lens.

(2) The eye ball has become to small.

Ray diagram for correction of hypermetropia –

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