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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
What is the other name for
myopia
A man can read the number of a distant but clearly but he finds difficulty in reading a book.
What type of spectacle lens should he use to correct the defect?
What is long-sightedness? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show:
(i) the eye-defect long-sightedness.
(ii) correction of long-sightedness by using a lens.
State one role of ciliary muscles in the human eye.
Choose the correct answer :
Presbyopia is a disease of _____________
Give Reason:
Older people require glasses to read and write.
Differentiate between:
Myopia and Hypermetropia.
Myopia and hypermetropia can be corrected by:
When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?
Observe the figure whether it is correct or not and explain the phenomenon.
