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प्रश्न
Write scientific reason.
Presbyopia effect is more common in people over 40 years of age.
उत्तर
- Focusing power of the eye lens decreases with age.
- Also, with progressing age, ciliary the muscles near the eye lens lose their ability to adjust the focal length of the lens.
- This defect of vision is called as presbyopia.
- As the defect is prnounced by old age, it is more common in people over 40 years of age.
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संबंधित प्रश्न
A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision and (ii) near vision?
Anuja’s father cannot see nearby objects clearly.
(a) What is the eye defect he is suffering from?
(b) How is it corrected?
Bifocal lens is required to correct _______ defect.
Write the name.
The defect of eye occurring due to ageing
Distinguish between:
Myopia - Presbyopia
The eye defect ‘presbyopia’ can be corrected by
Complete the correlation:
Farsightedness : Convex lens : : Presbyopia : ______
Write a short note on Presbyopia.
