With normal vision, light enters the eyes through the cornea and lens, which work together to refract (bend) the light rays ...

Cornea Tough, transparent covering over the ... so as to increase or decrease the refraction of light. Suspensory ligaments Connect the ciliary muscles to the lens and hold the lens in place.

The cornea serves several functions, including refraction of light to the retina to produce visual images, and as a barrier, preventing pathogens and foreign objects from entering the eye.