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To the Editor:
—I am in complete agreement with Dr. Miles' statement that after-images can be altered as well as inhibited centrally.I do not, however, feel that the experiment he cites proves the retinal nature of after-images. This experiment does not exclude the possibility of cerebral transfer of the after-image. In fact, the Brock-Givner Test, A.M.A. Arch. Ophth. 47:779, 1952, is based on the retinal stimulation of only one eye with the nonstimulated eye seeing the after-image.
Urist MJ. AFTER-IMAGES AND OCULAR MUSCLE PROPRIOCEPTION. AMA Arch Ophthalmol. 1959;62(5):918. doi:10.1001/archopht.1959.04220050178031