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To the Editor:
—Probably Dr. Loewenstein and Dr. Donald would not have written their paper, "A Color Stereoscopic Phenomenon," which appears in your October issue (Arch. Ophth. 26: 553, 1941) if they had run across my much shorter paper of thirteen years ago (Verhoeff, F. H. : An Optical Illusion Due to Chromatic Aberration, Am. J. Ophth. 11: 898, 1928). I not only described the phenomenon about which they speculate but pointed out features of it which they overlook or misunderstand. Moreover, I clearly demonstrated that it is dependent on two optical factors, chromatic aberration and eccentricity of the lens system, while they attribute it in great part to some obscure psychologic cause. I also pointed out that the eccentricity can be provided by artificial means when, as is sometimes the case, a person does not possess a sufficient amount of it to permit him to observe the phenomenon. This fact
Verhoeff FH. "A COLOR STEREOSCOPIC PHENOMENON". Arch Ophthalmol. 1941;26(5):914. doi:10.1001/archopht.1941.00870170206014
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