Glossary

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TermDefinition 
 
Indirect Astigmatism See also Against-The-Rule Astigmatism.View
Induced AstigmatismAstigmatism created by the different refractive indices of a contact lens material and the tears. See also Astigmatism. View
InfiltratesSmall cloudy areas of inflammatory cells within the cornea. These cells develop secondary to infection, chemical or toxic stimulus.View
Irregular Astigmatism Astigmatism where the two principal meridians are not at right angles to each other. This condition is often the result of injury or disease, but can also exist in an eye with irregularities in the refractive power in different meridians of the crystalline lens. See also Astigmatism.View
Isotonic SolutionA solution where the water concentration is the same on either side. There is no net movement of water. View
Keratoconjunctivitis SiccaDryness on the cornea and/or conjunctival surface. This disease is caused by decreased tear production and/or tear film evaporation. View
KeratoconusA bilateral but typically asymmetric corneal disease characterized by thinning cone-shaped protrusion of the central cornea. Keratoconus is categorized by the severity of power, location and shape of the cone. View
KeratoglobusAn extremely rare diffuse globoid protrusion of the cornea. The stroma as well as the limbus is thinned diffusely. View
LASEKReshaping the anterior central cornea using an excimer laser to ablate tissue from the stromal layer of the cornea. In LASEK, an alcoholic solution is used to cause the epithelial cells to loosen; the surgeon will fold the epithelial layer out of the laser treatment field, and fold it back in its original place after cornea has been reshaped by the laser.View
Laser Epithelial KeratomileusisSee also LASEK. View
Laser-Assisted in Situ Keratomileusis See also LASIK. View
LASIKReshaping the anterior central cornea using an excimer laser to ablate tissue from the stromal layer of the cornea. In LASIK, the epithelial and a portion of the stromal layer are cut into a flap and laid back to expose the corneal tissue to be ablated. This flap is folded back in its original place after cornea has been reshaped by the laser.View
Lathe CutA contact lens manufacturing process where a lens blank is carved by a spinning cutting tool.View
Lenticular AstigmatismCondition where the shape of the natural crystalline lens results in light rays that focus at more than one point on the retina. See also Astigmatism.View
Lenticular Multifocal Contact LensesSee also Concentric Multifocal Contact Lenses . View
Lissamine GreenA dye which stains dead or degenerated epithelial cells. This dye is comparable to Rose Bengal but has been noted as causing less discomfort. View
MicrocystsSmall cystic vesicles that develop within the corneal epithelium.View
Mini-Scleral LensRigid contact lens that extends beyond the limbus onto the conjunctiva. View
Mixed Astigmatism Ocular astigmatism where one principle meridian is myopic and the other is hyperopic. See also Astigmatism.View
Modified Fluorosilicone AcrylatePolymer used in the manufacturing of button materials for rigid contact lenses.View