Paheli observed that her father was not able to see nearby objects clearly and her grandfather's eye lens was clouded and her younger brother was not able to read from the distance, she went with all of them to an eye specialist and he identified them having different problems and gave different solutions a) What according to you is the defect of her brother and type of lens recommended?(5) b) What according to you is the defect of her father and type of lens recommended?(.5) e) Identify the problem of grandfather and what solution the doctor would have prescribed.(.5) d)Suggest measures to take care of eyes (any 2 points).(1) e) Out of the three problems which can be rectified with surgery. (.5) f) Mention the role of Iris in our eyes(1)
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Answer:
a) What according to you is the defect of her brother and the type of lens recommended?
Paheli's brother has myopia (short-sightedness), which means he cannot see distant objects clearly. The type of lens recommend to him is a concave lens.
b) What according to you is the defect of her father and the type of lens recommended?
Paheli's father has hyperopia (Long-sightedness/Farsightedness), which means he finds it hard to see things nearby, but he can see things far away clearly. The type of lens recommended to him is a convex lens.
e) Identify the problem of the grandfather and what solution the doctor would have prescribed.
Paheli's grandfather has cataracts, which means the lens of the eye becomes progressively opaque, resulting in blurred vision. The type of lens recommended to him is an intraocular lens.
d)Suggest measures to take care of eyes (any 2 points).
1) Take Frequent Breaks From the Screens
2) Consumption of a Balanced Diet.
e) Out of the three problems which can be rectified with surgery.
All three of them can,
Myopia can be rectified with LASIK surgery.
Hyperopia can be rectified with cornea-based or lens-based surgery.
Cataracts can be rectified with lens replacement surgery.
f) Mention the role of Iris in our eyes
The function of the iris in the eye is to control the amount of light that reaches the retina. It does this by changing the size of the pupil, the transparent window that allows light into the eye's interior.
Answer:
a) her brother has nearsightedness or myopia.
biconcave lens
b) the father has farsightedness or hypermetropia.
biconvex lens
c) grandfather has cataract
it can be only recovered by a surgery
d) read books from a proper distance
use eye drops
use spectacles if needed
consult a doctor if needed
e) cataract (grandfather)
f) iris is a dark-colored muscle that defines the color of our eyes, it also controls the size of the pupil.
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