As a consequence, it is likely that the eyelid applies more force on the superior than inferior cornea. Doane studied the dynamics of eyelid anatomy during blinking and found that during a blink the descent of the upper eyelid reaches its maximum speed at about the time it crosses the visual axis. During blinking, which occurs on average between 3 times per hour, the vertical traverse of the upper lid is much greater than that of the lower lid. We postulated that the eyelid might effectively be chafing the surface epithelium during blinking and that the posterior surface of the semi-rigid tarsus provides a template for the outer shape of the epithelial surface. This non-uniformity seems to provide evidence that the epithelial thickness is regulated by eyelid mechanics and blinking, as we suggested in 1994.
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