cornea. This modest, dome-shaped goggle not only protects the eye from worldly assaults, but actually does two-thirds of the eyeball’s focusing. The lens, which gets all the credit in the popular mind, does only about a third of the focusing.20 The cornea could hardly be less imposing. If you were to pop it out and lay it on the tip of your finger (where it would fit very comfortably) it wouldn’t seem much at all. But on closer examination, as with almost every part of the body, it is a wonder of complexity. It has five layers – epithelium, Bowman’s membrane, stroma, Descemet’s membrane and
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