A child was prescribed the following lenses for his spectacles by the optician:Left eye: + 2.50D, Right eye: +1.25D .The child has a defect of vision called:

Presbyopia

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Myopia

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Hypermetropia

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Astigmatism

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Solution

The correct option is B Hypermetropia
The prescribed spectacles are of positive power which means the lenses are convex (converging).
The convex lens is used when a person cannot see the nearby objects clearly because the image received by the eye is focused behind the retina.
This disease is called hypermetropia and is also known as far-sightedness.

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Similar questions

Q. The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
(a) Are these lenses thinner at the middle or at the edges?
(b) Which lens has a greater focal length?
(c) Which is the weaker eye?

Q. The defect hypermetropia of an eye can be corrected by using spectacles containing ....................... lens.

Name the eye defect in which eye lens becomes cloudy or milky. Mention the method for its correction. A person uses a lens of power -1.0 D for correcting his distant vision and for correcting his near vision he uses a lens of power + 2.0 D. Calculate the focal length of the lenses required to correct these defects. Explain why a normal eye is not able to see clearly the objects placed closer than the near points.

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