Which muscles contract, making the lens rounder to focus on close objects, and relax to flatten the lens, enabling focus on distant objects?
A)iris
B)muscles of the eyelid
C)ciliary muscles
D)pupil

Question

Quizplus · Accepted Answer

The ciliary muscles contract to make the lens rounder and focus on close objects and relax to flatten the lens and focus on distant objects. The iris adjusts the size of the pupil to control the amount of light entering the eye, but it does not affect the shape of the lens. The muscles of the eyelid play a role in opening and closing the eyelid, but they do not affect the lens. Therefore, C is the correct answer.

Which Muscles Contract, Making the Lens Rounder to Focus on Close