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प्रश्न
List three common refractive defects of vision. Suggest the way of correcting these defects.
उत्तर
The three common refractive defects of vision are as follows:-
Myopia (short-sightedness):- It is corrected by using spectacles having concave lenses of appropriate power.
Hypermetropia (far-sightedness):- It is corrected by using spectacles having convex lenses of appropriate power.
Presbyopia:- This defect is corrected using bifocal lenses of appropriate power in which the upper part consists of a concave lens (to correct myopia) and the lower part consists of a convex lens (to correct hypermetropia).
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संबंधित प्रश्न
What is myopia?
What is the far point and near point of the human eye with normal vision?
What is the scientific name of
long-sightedness?
What are the two most common defects of vision (or defects of eye)? How are they corrected?
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.
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
In what two whys is a yellow spot different from the blind spot?
Name an old age eye defect. Why is it caused?
Given below is a diagrammatic representation of a defect of the human eye:
(i) Identify the defect.
(ii) Mention two reasons for the above defect.
(iii) State how the defect can be rectified.
(iv) Name the part of the eye responsible for maintaining the shape of the eyeball.
Myopia and hypermetropia can be corrected by:
