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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14256788

Fusing the upper pictures requires 3 1/2 prism diopters of Fusional Convergence. Changing Fixation from upper to lower pictures... by Keystone View Co

Original public domain image from Getty Museum

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Fusing the upper pictures requires 3 1/2 prism diopters of Fusional Convergence. Changing Fixation from upper to lower pictures... by Keystone View Co

More