What is the function of the sclera?

What is the function of the sclera?

• A. Tough outer layer that protects the eye.
• B. Light-sensitive layer that detects color.
• C. Muscle that adjusts the lens focus.
• D. Transparent layer through which light passes.

Answer: (A)

The sclera’s job is to protect the eye and keep its shape. It’s the tough, opaque outer coat made of dense connective tissue that surrounds most of the eyeball, providing a sturdy barrier against injury and helping maintain the globe’s structure. It also serves as an anchor point for the external eye muscles that move the eye. The other options point to different parts: the light-sensitive layer that detects color is the retina, the muscle that adjusts lens focus is the ciliary muscle, and the transparent layer through which light passes is the cornea. The sclera is not involved in light transmission and is not the site of photoreceptors or accommodation; its primary role is protection and mechanical support.

The sclera’s job is to protect the eye and keep its shape. It’s the tough, opaque outer coat made of dense connective tissue that surrounds most of the eyeball, providing a sturdy barrier against injury and helping maintain the globe’s structure. It also serves as an anchor point for the external eye muscles that move the eye.

The other options point to different parts: the light-sensitive layer that detects color is the retina, the muscle that adjusts lens focus is the ciliary muscle, and the transparent layer through which light passes is the cornea. The sclera is not involved in light transmission and is not the site of photoreceptors or accommodation; its primary role is protection and mechanical support.