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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
What is the other name for
hypermetropia
What is short-sightedness? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show:
(i) the eye-defect short-sightedness.
(ii) correction of short-sightedness by using a lens.
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.
The picture given here shows a person wearing 'half-moon' spectacles. What sort of eye-defect do do you think he has? Why are these particular spectacles useful to him?
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.
In what two whys is a yellow spot different from the blind spot?
Name an old age eye defect. Why is it caused?
Explain the Term: Astigmatism
Choose the Odd One Out:
Myopia may arise due to ____________.
