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Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye?
The ciliary muscles of the human eye can contract or relax for making the eye-lens thick or thin because of which the eyes can focus on nearby as well as distant objects on the retina. Thus, ciliary muscles help in the normal functioning of the eye.
Explanation
Ciliary muscles are circular muscle which accommodates the eye lens, means it changes the thickness of the eye-lens while focussing by changing its shape and thereby enable us to see objects that are near or far away.
Therefore, when the light is coming from a distant object the light rays refract slightly as the lens got stretched/tighten by ciliary muscles which results in a decrease in the thickness of the lens (becomes thin).
Whereas, when the light is coming from a nearby object the light rays refract (bends) more strongly as the lens got slacken/loosen by ciliary muscles which results in an increase in the thickness of the lens (becomes thick).
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