Cornea
The cornea is the clear tissue in front of the eye that covers the colored iris and pupil and is often referred to as the "window" of the eye. The cornea helps direct light towards the lens for focusing and allows light to pass through it to reach the back of the eye. For clear vision, the cornea must be healthy and clear. Because the cornea is the outermost part of the eye, several factors can disrupt corneal health including injury and corneal disease. These factors can prevent light from passing through the cornea, thus affecting vision.
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