What is the primary function of the cornea in relation to contact lenses?

The primary function of the cornea in relation to contact lenses is to help focus light entering the eye. The cornea is the transparent front part of the eye that refracts light, bending it so that it can enter the eye and reach the retina. This process is essential for clear vision, as the cornea provides a significant amount of the eye's total optical power, about 43 diopters.

When fitting contact lenses, understanding the cornea's role is crucial since the contact lens sits directly on this surface. The correct curvature and refractive properties of the contact lens are necessary to ensure that light is focused properly, enabling users to achieve clear vision. If the lens does not perform this function effectively, it can lead to blurred vision or discomfort.

While tear production, protection against debris, and intraocular pressure regulation are all important aspects of eye health, they do not directly relate to the primary optical function of the cornea in relation to contact lenses.