In the refracting system of the eye

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2022-08-10

In the refracting system of the eye.

The cornea causes more refraction than the lens.
More refraction occurs at the inner surface of the cornea than at the outer surface.
The lens, by becoming more convex, can more than double the total refractive power of the eye.
The back surface of the lens contributes more to accommodation than the front.
Ageing reduces the maximum refractive power of the eye.

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safaTerkawi

2022-08-10

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A. True This is because of the large change in refractive index from air to cornea.

B. False The outer interface is with air; cornea and aqueous have similar refractive indi-ces.

C. False It can only increase total refractive power by about 15–20 per cent.

D. False During accommodation, the front of the lens bulges more than the back.

E. True As the lens stiffens, ability to increase convexity when ciliary muscles contract is diminished.

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