Whats the difference between traditional lenses and scleral lenses?
Scleral lenses cover the “sclera”, or white of the eye. They are larger in diameter (18-24 mm) than traditional lenses, which generally only cover the iris (colored part of the eye), and are usually 14-15 mm. Scleral lenses work great for bloodshot effects, where the entire inside of the eye needs to be covered, and to avoid seeing the edge of the lens. Scleral lenses are available in either hard or soft lens materials. However, very few eye doctors are familiar with scleral lenses, so there are a limited number of doctors who can fit these larger lenses. With traditional size lenses, the corneal curvature measurements can be done at most doctor’s offices, and the lens curvature can be determined from those measurements. For scleral lenses, it is impossible to know which size and curvature lens will work without actually trying the lenses on for fit. Poorly fit lenses will cause discomfort to the actor, air bubbles, bulging of the lens or poor scleral coverage; any of which will result
