ANSI Z80.20-1998

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ANSI Z80.20-1998 Ophthalmics: Contact Lenses - Standard Terminology, Tolerances, Measurements and Physicochemical Properties (revision, redesignation and consolidation of ANSI Z80.2-1989, ANSI Z80.6-1983, and ANSI Z80.8-1986)

standard published 01/01/1998 by American National Standards Institute

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Applies to contact lenses that have prescribed refractive and/or prismatic powers, which are devices worn over the front surface of the eye in contact with the preocular tear film. The standard covers rigid (hard) intracorneal and haptic (scleral) contact lenses, as well as flexible paralimbal contact lenses.