The change in focal length of an eye lens is caused by the action of

pupil

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retina

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ciliary muscles

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iris

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Solution

The correct option is D ciliary muscles
The answer is C.
The ciliary muscle is a circular muscle that relaxes or tightens the zonules to enable the lens to change shape for focusing. The zonules are fibers that hold the lens suspended in position and enable it to change shape during accommodation. It increases or decreases the focal length of the eye lens.

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Similar questions

The change in focal length of an eye lens is caused by the action of the

(a) pupil

(b) retina

(d) iris

Relaxation of the ciliary muscles causes the focal length of eye lens to:

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