Tear Exchange

Tear exchange is a process used in contact lens fitting where tears move between the eye and the space beneath the lens during blinking. This movement helps prevent debris buildup, maintains oxygen flow to the eye, and enhances comfort. Essentially, tears circulate under the lens, exchanging with those on the eye's surface, which helps keep the eye healthy and reduces risks like infections. Proper tear exchange depends on the lens design and fit, allowing the eye to "breathe" better and ensuring the lens remains comfortable during wear.