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प्रश्न
Explain the Term: Cataract
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उत्तर
Cataract: It is a condition in which the lens turns opaque and the vision is cut down even to total blindness. It can be corrected by surgically removing the lens and by using spectacles with highly convex lense.
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संबंधित प्रश्न
What is the far point and near point of the human eye with normal vision?
Name the defect of vision which can be corrected by a diverging lens. Show clearly by a ray diagram how the lens corrects the defect.
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.
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?
Explain the terms ‘adaptation’ and ‘accommodation’ with reference to the eye.
Write whether the following is true or false:
A convex lens is used for correcting myopia.
Draw a neat labeled diagram to show how hypermetropia can be rectified.
Explain the Term: Hypermetropia
What are the causes of ‘Myopia’?
Myopia may arise due to ____________.
