What is the main purpose of the cornea in the eye?

The main purpose of the cornea is to focus light and protect the inner structures of the eye. The cornea is the transparent front part of the eye and plays a crucial role in the eye’s optical system. It is responsible for bending (refracting) the light rays that enter the eye to help them converge onto the retina, where images are formed. This refraction is essential for clear vision. Additionally, the cornea serves as a barrier that shields the inner eye components from dust, debris, and pathogens, contributing to the overall safety and health of the eye.

The other options do not accurately describe the primary functions of the cornea. For instance, while tear production is essential for eye lubrication, it is primarily the role of the lacrimal glands, not the cornea. Reflecting light away from the lens does not align with the cornea's purpose; rather, it facilitates focusing light into the eye. Transmitting signals to the optic nerve is the function of the retina, which converts light into electrical signals for vision processing, not a role of the cornea.