The cornea is the transparent window at the front of the eye. It has 5 layers:
- The epithelium, which lines the outer surface.
- Bowman's membrane, which supports the epithelium.
- The stroma, which provides thickness and strength to the cornea. Unlike the sclera, the cornea is transparent because it has a low water content.
- Descemet's membrane, which supports the endothelium.
- The endothelium, which lines the inner surface of the cornea. This membrane pumps water out of the corneal stroma, maintaining transparency.