A person is unable to see objects distinctly placed with in 50 cm from his eye.
(a) name the defect of vision the person is suffering from and list its two possible causes
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The disease is hypermetropia.
Explanation:
- Hypermetropia is a disease which occurs because of the unable of eye focusing structures to focus the light on the retina.
- The light rays are incident before the retina.
- This leads to the blurring of image that are produced from objects placed very near to the eye.
- The probable causes of the disease is
- A. Shortening of eye ball.
- B. Abnormal curvature of the lens.
- This is seen in the elderly people and is corrected by convex lens.
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The defect of his vision is hypermetropia.
Explanation:
- The defect of his vision is hypermetropia.
- This is also known as farsightedness.
- A person suffering from hypermetropia can not see distant objects clearly.
- The point of comfortable reading for such person is 25 cm. He has to keep the reading material 25 away from him to read it clearly.
- This defect occurs due to two reasons either the focal length of the eye is long or the eyeball is small.
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