What is the primary function of the cornea in the eye?

The primary function of the cornea in the eye is to focus light onto the retina. The cornea is the transparent, dome-shaped front surface of the eye and plays a critical role in the visual process. When light enters the eye, it first passes through the cornea, which refracts or bends the light rays. This refraction is essential for directing the light precisely onto the retina, the light-sensitive layer of tissue at the back of the eye responsible for converting light into neural signals that the brain interprets as images.

While the cornea does contribute to protection and some regulation of light entry, its main role is that of focusing light. The shape and curvature of the cornea are designed to provide a significant degree of light refraction, making it a key element in achieving clear vision.