>In an effort to determine how a lack of gravity effects eye movements, NASA conducted a series of experiments on the International Space Station in the mid 2000s. The results of aren’t useful to earthbound people (Spoiler: gravity affects eye-movements), but the eye-tracking technology developed for the experiments makes LASIK vision correction surgery possible.<p>In the mid 2000's LASIK was already widely used since years, AFAICR.