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प्रश्न
Explain the Term: Presbyopia
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उत्तर
Presbyopia: It is a condition affecting older people who cannot see near objects clearly. Their lens loses flexibility resulting in a kind of far-sightedness. This again is corrected by a convex lens.
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संबंधित प्रश्न
Name any two defects of vision which can be corrected by using spectacles.
What is the far point of a person suffering from myopia (or short-sightedness)?
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?
Though a woman can see the distant object clearly, she cannot see the nearby objects clearly. She is suffering from the defect of vision called:
(a) long-sight
(b) short-sight
(c) hind-sight
(d) mid-sight
A person can read a book clearly only if he holds it at an arm's length from him. Name the defect of vision:
if the person is a young man
Given below is a diagram depicting a defect of the human eye. Study the same and answer the question that follow:
Name the defect shown in the diagram.
Name the following:
The photosensitive pigment present in the rod cells of the retina.
Differentiate between:
Short-sightedness and Long-sightedness.
The diagram given below represents the cross-section of the human eye:
(i) Name the parts labeled 1—12.
(ii) What is the function of the part marked ‘10’?
(iii) What would happen if part ‘5’ is damaged or cut?
Mention, if the following statement is True or False
Hypermetropia is a defect of the eye caused due to the eyeball elongation
