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प्रश्न
Name an old age eye defect. What happens in it?
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उत्तर
Presbyopia is an age-old eye defect. In this condition, the lens loses flexibility resulting in far-sightedness.
Cataract is also very common in old people, the cornea becomes opaque and the vision is cut down even to blindness.
संबंधित प्रश्न
List three common refractive defects of vision. Suggest the way of correcting these defects.
Name the defect of vision in a person:
whose near point is more than 25 on away.
A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard.
How can this defect by corrected?
Explain with the help of labelled ray diagram, the defect of vision called myopia and how it is corrected by a lens.
Enumerate the common defects of vision, their causes and the possible methods of correcting them.
A person is unable to read a book placed closer than 1 meter from his eyes. Identify the defect of vision in his eyes. Draw the ray diagrams to show the defect of vision and its correction.
State one role of ciliary muscles in the human eye.
Draw a neat labeled diagram to show how hypermetropia can be rectified.
Mention, if the following statement is True or False
Hypermetropia is a defect of the eye caused due to the eyeball elongation
Name the following:
Two kinds of accomodations.
