Polarized Variable Vectograph: Chain

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The Chain Polarized Variable Vectograph provides an introduction to binocular experiences. Features a total accommodation range of 40-diopters with a 16-diopter range for base-in ( divergence) training and a 24-diopter range for base-out (convergence).Includes the right & left vectographs, a guide, and standard polarized glasses. Show more