Scleral lenses are large diameter gas permeable contact lenses that vault over the cornea (the clear part of the eye) and rest over the sclera (the white part of the eye). They are usually used to correct vision problems caused by Keratoconus, very high levels of myopia (nearsightedness) and irregular corneas. But they can also be extremely useful in moderate-severe cases of dry eyes. With scleral lenses, the cornea is constantly lubricated in saline solution which as a result moistens and heals ocular damage caused by moderate to severe dry eye.