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To the Editor:
—In the December, 1956, issue of the Archives, page 878, is published a paper entitled "Stereopsis and Unequal Luminosities of the Images in the Two Eyes," written by K. N. Ogle, Ph.D., and Judith Groch, B.S. This paper deals chiefly with a phenomenon I described in the Archives 23 years ago. Since these authors discredit the observations I reported, I feel called upon to comment upon their paper.The phenomenon in question was the observation that when the luminosity of one disparate retinal image of an object was greatly reduced below that of the other image the depth effect was reduced and the apparent position of the object was shifted laterally. Ogle and Groch admit, although apparently with reluctance, the lateral shift of the object, but they deny the depth effect. They make this serious misstatement: "this lateral deviation, which Verhoeff stated is proportional to the difference
Verhoeff FH. STEREOPSIS AND UNEQUAL LUMINOSITIES OF THE IMAGES IN THE TWO EYES. AMA Arch Ophthalmol. 1957;57(5):783–784. doi:10.1001/archopht.1957.00930050757018
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