GULDEN HORIZONTAL & VERTICAL PRISM BARS

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Gulden Prism Bars for the clinical measurement of a patient's fusional vergence ability. Vergence movements are the separate rotational movements of the eyes. Plastic prisms measure the degree of divergence from binocular vision. Horizontal Includes: 1,2,4,6,8,10,12,14,16,18,20,25,30,35,40 & 45PD & Vertical Includes: 1,2,3,4,5,6,8,10,12,14,16,18,20,25 & 30PD