Question

What are the changes in ciliary muscle when nearby objects and distant objects are viewed?

• A. When objects near the eyes are viewed,the ciliary muscles contract and while viewing distant objects ciliary muscles relax.
• B. When objects near the eyes are viewed,the ciliary muscles relax and while viewing distant objects ciliary muscles contract.
• C. Cilliary muscle is not related to the functioning of the lens and provides mechanical support only.
• D. Ciliary muscles contract or relax depending on the intensity of the light and not hte distance of the object.

Answer 1

The correct option is A When objects near the eyes are viewed,the ciliary muscles contract and while viewing distant objects ciliary muscles relax.

The change in the curvature of the eye lens can thus change its focal length. When the muscles are relaxed, the lens becomes thin. Thus, its focal length increases. This enables us to see distant objects clearly. When you are looking at objects closer to the eye, the ciliary muscles contract. This increases the curvature of the eye lens. The eye lens then becomes thicker. Consequently, the focal length of the eye lens decreases. This enables us to see nearby objects clearly.