What is the primary function of the cornea?

The primary function of the cornea is to refract light as it enters the eye. The cornea is a transparent, dome-shaped surface that covers the front of the eye. Its curved shape is critical in bending (refracting) light rays so that they can be properly focused onto the retina at the back of the eye. This refraction is essential for clear vision, as it helps to direct light toward the lens and retina, enabling the visual process.

While the cornea also plays a role in protecting the inner structures of the eye and contributes to the eye's overall curvature, its main role is to ensure that light is adequately refracted for vision. Options related to detecting color and transmitting visual signals pertain to other structures within the eye, such as the retina and photoreceptors, rather than the cornea itself. The function of providing structure and support is more generalized and applies to various components of the eye, but it does not specifically highlight the key refractive role of the cornea.