Clips on patient's glasses for over-refraction. Holds three trial lenses insteat of two. Metal spring clips are rubber coated. Avoid vertex distance error between phoropter and spectacles. Converts children's spectacle frame to a child's trial frame. Comparable to Keeler and Jannelli trial lens clips. Holds standard 1 1/2"(38mm) trial lenses. Lens cell single.

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