Glossary

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TermDefinition 
 
Translating Multifocal Contact LensesSee also Alternating Multifocal Contact Lenses.View
TruncationStabilization technique where the bottom portion of the contact lens is sliced off, so as to form a “shelf” that will rest on the lower lid. View
Viscosity Agents Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction. View
With-The-Rule Astigmatism The flattest (longest) radius of corneal curvature lies horizontally and the steepest (shortest) curve of the cornea is vertical. This form of astigmatism has its greatest refractive power in the vertical meridian. See also Astigmatism. View
Wratten Yellow FilterA photographic yellow filter used with a slit-lamp to assist in visualizing corneal staining as well as rigid gas permeable fluorescein patterns. View