Question

the lens of the eye is an accessory structure because it: focuses incoming light and modifies it. converts light energy into nerve signals. carries nerve signals to the brain to form images. shields the eye from injury and foreign objects.

Explanation:

1. Analyze each option:

• Option 1: The lens of the eye focuses incoming light (by changing shape to adjust focus for near and far objects) and modifies it (refracts light to help form a clear image on the retina). This is correct.
• Option 2: Converting light energy into nerve signals is the function of photoreceptor cells (rods and cones) in the retina, not the lens.
• Option 3: Carrying nerve signals to the brain is the function of the optic nerve, not the lens.
• Option 4: Shielding the eye from injury and foreign objects is the function of structures like the eyelids, eyelashes, and conjunctiva, not the lens.

Answer:

focuses incoming light and modifies it.