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Changing Fixation from 1 to 4 requires 4 1/2 prism diopters of Positive Convergence. by Keystone View Co and Underwood and Underwood

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Changing Fixation from 1 to 4 requires 4 1/2 prism diopters of Positive Convergence. by Keystone View Co and Underwood and Underwood

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