The cornea is a thin and transparent, yet extremely strong tissue that supplies a majority of the eye's refractive, or light-bending, power. It is one of the most sensitive tissues in the body. The thickness of the equine cornea is about 1.5 mm, and it consists of four layers (see "Corneal Anatomy" on page 68):
- The outer epithelium is a barrier to bacteria and the tear film;
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