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Common Defects of the Eye

An optician u...

Question

An optician used concave lens to correct the defect of eye so that the customer can see clearly. Which defect of vision could it be?

A

Cataract

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B

Conjunctivitis

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C

Near sightedness

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D

Far sightedness

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Solution

The correct option is C
Near sightedness

The customer is suffering from Myopia (Near sightedness) which is corrected using concave lens.

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Similar questions

Q. (a) What is short-sightedness? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show:
(i) the eye-defect short-sightedness.
(ii) correction of short-sightedness by using a lens.
(b) A person having short-sight cannot see objects clearly beyond a distance of 1.5 m. What would be the nature and power of the corrective lens to restore proper vision?

Q. A person suffering from myopia (short-sightedness) can see clearly only up to a distance of 2m.What is the power of concave lens required to rectify this defect?

Q. Short-sightedness means that the eye can see the nearby objects clearly and long-sightedness means that the eye can see the distant objects clearly.

Q. Complete the following sentence :

(I). A short-sighted person cannot see ............... object clearly. Short-sightedness can be correct by using ........... lenses.

(II). A long-sighted person cannot see .............. object clearly. Long-sightedness can be corrected by using ............ lenses.

Q. A person needs a lens of power –4.5 D for correction of her vision. What kind of defect in vision is the person suffering from?

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Common Defects of the Eye

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