From Cornea to Retina: The human eye focuses light much like a camera. Light first enters through the tear film and then through the clear cornea. In order to have clear vision, it literally starts with having a healthy tear film. Otherwise, the light rays will be scattered before your eye even gets the chance to focus them. Then, the light passes through the cornea, which bends (refracts) the rays toward the lens of the eye. The lens then fine-tunes the focus, directing light onto the retina at the back of the eye. The retina converts these light signals into images. An easy analogy is to imagine the eye as a camera: the cornea and lens are like a camera’s lens system focusing light onto the retina, which acts like the film or digital sensor capturing the picture. This coordinated focusing process allows us to see a clear image of the world.