Question

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

• A. pupil
• B. retina
• C. ciliary muscles
• D. iris

Answer 1

The Correct Option is C

Ciliary muscle action alters the eye lens curvature, which in turn modifies the eye's focal length. Therefore, ciliary muscles are responsible for changes in the eye lens's focal length.
Option (C), ciliary muscles, is the correct answer.