what the light entering the eye reaches the lens through the optic nerve?
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In dim light, the pupil enlarges to allow more light to enter the eye. Light then reaches the crystalline lens. ... Behind the lens and in front of the retina is a chamber called the vitreous body, which contains a clear, gelatinous fluid called vitreous humor
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A muscle cramp is an instant pain which stays for few seconds to
Several minutes.It is very strong and occurs due to the contraction and tightening of muscles.It often occurs in the legs.
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