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 the clear, dome-shaped surface that covers the front of the eye and is essential for vision. It acts as the first and most powerful refractive surface in the eye, contributing a significant portion of the total optical power. When light rays pass through the cornea, they are bent, or refracted, to help focus these rays onto the retina, where the images can be processed.

Although the cornea does assist in focusing light on the retina, this process is largely a result of its refractive capabilities. The cornea's curved shape and transparent nature ensure that light can enter the eye effectively while also enabling adequate focusing to produce clear images. Understanding the cornea's crucial role in refraction helps in appreciating its importance in overall eye function and vision correction strategies.