SEAL
Superior epithelial arcuate lesion. Thin arcuate white lesion in the superior cornea; within 1-3mm of the superior limbus between 10 and 2 o’clock. SEALs can be up to 0.5mm wide and from 1 to 5 mm in length, sometimes with … Continue reading
Glossary
Silicone hydrogel contact lens material
Silicone hydrogel contact lenses were first introduced into the market in 1999. The incorporation of silicone increases the material’s oxygen transmission, while the hydrogel component allows for fluid transport and lens movement. The combination of these two components allows for … Continue reading
Sodium fluorescein
see Fluorescein.
Staining
The appearance of tissue disruption and other patho-physiological changes in the front surface of the eye as revealed with the aid of one or more of a number of dyes, such as fluorescein, rose bengal or alcian blue. Also see … Continue reading
Superior epithelial arcuate lesion
see SEAL.
Surfactant
Surfactants are compounds that contain both a hydrophilic and a hydrophobic portion and serves to increase wettability on a lens surface. Some contact lenses, such as rigid gas permeable lenses, are composed of mainly hydrophobic material that will have trouble … Continue reading
