Scleral contact lenses are large-diameter gas permeable (GP) lenses that offer many advantages over conventional GP lenses, including sharper vision, greater durability, easier handling, and less risk of complications. These lenses get their name from the fact that they cover not only the cornea, but also the "white" of the eye (the sclera).
Scleral lenses are more stable on the eye than conventional GP lenses, making them less likely to dislodge and more comfortable to wear, especially for those with sensitive eyes or irregularly shaped corneas.