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प्रश्न
After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles:
Left eye : + 2.00 D
Right eye : + 2.25 D
The child is suffering from the defect of vision called:
(a) short-sightedness
(b) long-sightedness
(c) cataract
(d) presbyopia
उत्तर
long-sightedness
The optician has prescribed convex lenses for the child's spectacles, because a convex lens is used to increase the converging power of the eye lens. This shows that the child is suffering from the defect of vision called long-sightedness.
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संबंधित प्रश्न
Fill in the following blank with suitable word:
The iris controls the amount of................entering the eye.
Describe the working of the human eye with the help of the above diagram.
How does the eye change in order to focus on near or distant objects?
(a) The lens moves in or out
(b) The retina moves in or out
(c) The lens becomes thicker or thinner
(d) The pupil gets larger or smaller
Mention, where in living organism is the following located and state their main function:
Fovea centralis
Define the following:
Yellow spot
Complete the paragraph by choosing the right options given below.
(minimum, near point, 25 cm, farthest, farthest distance, far point)
The _______ distance of an object from a normal eye, at which it is clearly visible without stress on the eye, is called the minimum distance of distinct vision. The position of the object at this distance is called the _______ of the eye, for a normal human eye, the near point is at _______. The _______ distance of an object from a human eye, at which it is clearly visible without stress on the eye is called _______ of distinct vision. The position of the object at this distance is called the _______ of the eye.
Write down the names of parts of the eye in the blank spaces shown in the figure.
State the functions of the following:
Ciliary muscles
Name the following:
The circular opening enclosed by iris.
With reference to human eye answer the question that follow:
Name the part of the eye associated with the regulation of the size of pupil.
