"Also from the Jet Propulsion Laboratory in the early 1980s: UV-resistant sunglasses. The lab's scientists were working on a way to protect astronauts' eyes from radiation, particularly ultraviolet light. They discovered that hawks, eagles and other raptors secreted oil droplets into their eyes that not only protected them from such radiation, but also enhanced their vision. Scientists were able to replicate the process using zinc oxide, which they applied to visors used on space missions. A company called SunTiger was then formed to market the invention as Eagle Eyes sunglasses and the rest, as the saying goes, is history. UV-resistant sunglasses are now worn by millions of people. Such sunglasses don't just protect from harmful UV rays, they also enhance vision clarity by blocking out blue light."