Night-blindness defects and correction
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It is corrected by the use of convex lenses for reading. In some eyes, rays of light from distant objects are not brought to a focus on the retina but are focused on a plane in front of the retina, as in myopia (nearsightedness), or behind the retina, as in hyperopia (farsightedness).
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when rods are not formed on retina. rods are responsible for the night vision. correction : eat food rich in vitamin a and colourful vegetables
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