The Physics of Teardrops

A lot can change in the blink of an eye. In fact, the entire surface layer of your eye changes every time you blink. In about a quarter of a second, fluid pours into the eye, it is swept over the surface to leave a new, thin coating, and the excess is drained. Though the system may sound simple, the physics gets quite complicated. Scientists now are using mathematical computer models to try to understand how the fluid travels through the eye and leaves as teardrops. "The reason why we're interested in studying this is because it's a highly dynamical system," said Kara Maki, a mathematics grad student at the University of Delaware. "If we can try to understand and gain insight into tear film dynamics, we can aim at trying to find better treatments for dry eye."

http://www.livescience.com/health/081120-teardrop-physics.html