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a type of spectacle frame with variable adjustments, for holding trial lenses during refraction.
Farlex Partner Medical Dictionary © Farlex 2012
tri·al frame(trī'ăl frām)
A type of spectacle frame with variable adjustments, for holding trial lenses during refraction.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
An eyeglass frame for holding trial lenses while a person is being fitted for glasses.
See also: frame
Medical Dictionary, © 2009 Farlex and Partners
Spectacle frame with variable adjustments for interpupillary distance, side length, etc. in which each lens rim is fitted with a number of cells into which trial lenses can be placed when testing vision (Fig. T18). See phoropter; Simultantest.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann