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False-colour scanning electron micrograph (SEM) of the surface of the cornea of the eye. The matrix- like pattern (seen here) consists of individual flattened transparent cells. This is a stratified squamous epithelium which is 5 cell layers deep. Tiny ridges (unseen) on each cell surface helps bind these cells together. Although richly supplied with nerves, there are no blood vessels in the cornea: this would affect its transparency. This external surface which encloses the anterior of the eye has a fixed convex curve; it provides the main mechanism for focusing light images onto the retina. Magnification: x90 at 6x7cm size. Magnification: x140 at 4x5 inch size.

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