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प्रश्न
Have a look at the posture of this girl who is reading a book and answer the questions which follow:
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- Name the problem she is facing.
- What are the two conditions shown in sections A and B of the eye as applicable to her.
- What kind of reading glasses does she need?
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| A | B |
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उत्तर
- Myopia
- Section A depicts hyperopia, which occurs when the picture forms behind the retina. Section Bis depicts myopia, a condition where the picture forms before the retina.
- She requires reading glasses with a concave lens.
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संबंधित प्रश्न
What is the other name for
hypermetropia
Your friend can read a book perfectly well but cannot read the writing on blackboard unless she sits on the front row in class.
What type of lenses-converging or diverging-would an optician prescribe for her?
The defect of vision which cannot be corrected by using spectacles is:
(a) myopia
(b) presbyopia
(c) cataract
(d) hypermetropia
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:
Give two possible reasons for this defect of the eye in human beings.
Rewrite the following table so as to match second and third column with first column.
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Column I
|
Column II
|
Column III
|
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(i) Myopia
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Old age problem
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Bifocal lens
|
|
(ii) Presbyopia
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Nearsightedness
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Concave lens.
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Differentiate between:
Short-sightedness and Long-sightedness.
Explain the Term: Astigmatism
Give Technical Term:
The type of lens used to correct myopia is
Observe the given below the figure, correct it and explain and write about the concept depicted in this figure.
