trial frame

tri·al frame

a type of spectacle frame with variable adjustments, for holding trial lenses during refraction.

tri·al frame

(trī'ăl frām) A type of spectacle frame with variable adjustments, for holding trial lenses during refraction.

trial frame

An eyeglass frame for holding trial lenses while a person is being fitted for glasses.See also: frame

trial frame 

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." >Fig. T18 Trial frame