Question

How do ciliary muscles regulate the focal length of the human eye?

Answer 1

The lens flexes to change its curvature and finish the focusing process. When an object is located at infinity, the focal length, or the distance from the cornea to the retina, of a normal relaxed eye

Answer 2

Hi there.. The ciliary muscles are the muscles which play a major role in adjustment of focal lens. When the ciliary muscles are relaxed, the focal lenth is more and because of this, the lens becomes thin. Also, when they contract, the curvature increases, the focal length decreases and it enables us to see the nearby objects clearly. In this way, the ciliary muscles regulate the focal length of human eye.

Hope it helped!