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Standard X
Physics
Astigmatism
For a normal ...
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For a normal eye,the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20D . using this information ,the distance between the retina and the cornea-eye lens can be estimated
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Q.
For a normal eye, the far point is at infinity and the near point of distinct vision is about
25
c
m
in front of the eye. The cornea of the eye provides a converging power of about
40
dioptres, and the least converging power of the eye - lens behind the cornea is about
20
dioptres. From this rough data estimate the range of accommodation (i.e., the range of converging power of the eye-lens) of a normal eye.
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