What do you understand by the following terms: normal eye defective eye least distance of distinct vision
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normal eye
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because the normal eye can see that
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NORMAL EYE:
A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart.
DEFECTIVE EYE:
a defect of vision in which objects appear to be distorted; usually due to a defect in the retina. moon blindness, night blindness, nyctalopia. inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder. photoretinitis.
DISTINCT VISION:
It is defined as the minimum distance between the eye lens and the object to form a clear image.
Explanation:
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