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. 5-1/2″ x 8″ card and polarized goggle.
Item #: BCFDC
