A punctal plug is like a drain stopper for the tear duct and keeps eyes moist by keeping more tears in the eye. (amcny.org)
Eyelashes are important for keeping eyes moist and clean, and when lashes get too long they don't do these jobs as well, researchers reported here this week at the annual meeting of the Society for Integrative and Comparative Biology. (sciencemag.org)
Newborns start making tears when they are about two weeks old, but often it is just enough to keep their eyes moist. (verywellfamily.com)