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Includes: 5-1/2" x 8" card and one pair of polarized goggles.
Features:
Variable slide adjust to determine fixation disparity or may be used with hand held prisms. Designed for phoroptor use. The card comes with a label which may be placed over the prism diopter scale for an additional scale in degrees. Reverse side of card includes reduced Snellen, fusional target and cross cylinder targets.