WHAT IS A SCLERAL LENS?
Scleral lenses are gas-permeable contact lenses which diameter range from 14 to 23 mm. Scleral lenses have the peculiarity to neutralize the regular and irregular corneal anterior astigmatism. They are called scleral because they vault over the cornea (the transparent front part of the eye that covers the iris, pupil, and anterior chamber) and bear on the sclera (the white outer layer of the eyeball).
Scleral lenses were the first contact lenses described in literature at the end of the 19th century. These lenses were made of glass and were used for therapeutic use and visual improvement. The material of the earlier lenses did not allow permeability to oxygen causing complications. Thus, rigid gas permeable corneal lenses and soft lenses became very popular, however, they cannot be fit in patients with irregular corneas and various diseases of eyes, leaving.
Scleral lenses began to gain popularity in the end of 1980s because of technological progress and development of new generations of materials for contact lenses with high permeability to oxygen and new technology in manufacturing the lenses.
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EASLA thanks Dr. Edward Boshnick for his contribution providing most of the images included in this website
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