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Accommodation Convergence Rule
Used to test & train monocular, binocular, accommodation, and rock. Trains convergence using physiological diplopia as the control on suppression. Features four scales: dioptric values, duane age, centimeters, and inches. Made of durable plastic with engraved black numbers. 21″ long. 7/16″ square. Includes accommodation convergence rule, card holder, and two eye chart cards.