Binocular Stereoscopic Vision

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WITH reference to a letter of mine in NATURE of December 10, 1938, Father William O'Leary, of Riverview College Observatory, Riverview, N.S.W., wrote to me shortly before his death, and, after mentioning that he also for many years past had been able to view stereoscopic pictures without a stereoscope, says: “The stereoscopic effect is also quite easily obtained by reversing the position of the pictures, putting the right to left and the left to right. If now, instead of focusing the eyes for parallel distant vision, we cross the eyes, the left eye then sees the right-hand picture and the right the left-hand picture. For some people this is rather painful, but I find no difficulty. The effect is a combination image, seemingly just half-way distant between the eyes and the two pictures, in fact, a miniature picture, but beautifully sharp in detail.”

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PATTERSON, T. Binocular Stereoscopic Vision. Nature 143, 1026 (1939) doi:10.1038/1431026a0

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