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प्रश्न
Name the common defects of the eye.
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उत्तर
Common defects of the eye:
(i) Near or short-sightedness (Myopia)
(ii) Far or long-sightedness (Hypermetropia)
(iii) Astigmatism.
(iv) Presbyopia.
(v) Night blindness.
(vi) Colour blindness.
(vii) Squint.
(viii) Cataract.
APPEARS IN
संबंधित प्रश्न
Which defect of vision can be rectified:
by using a convex lens?
What is the other name for
hypermetropia
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.
Name an old age eye defect. What happens in it?
A person is unable to read a book placed closer than 1 meter from his eyes. Identify the defect of vision in his eyes. Draw the ray diagrams to show the defect of vision and its correction.
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.
Give Reason:
Deficiency of vitamin A causes night blindness.
Choose the Odd One Out:
State reasons for Myopia. With the help of ray diagrams, show the:
- image formation by a myopic eye, and
- correction of myopia using an appropriate lens.
Have a look at the posture of this girl who is reading a book and answer the questions which follow:
 |
- 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?
 |
 |
| A | B |
