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August 1997

Motion Stereoscopic Vision, the Pulfrich Phenomenon, and Baseball Hitting-Reply

Author Affiliations

New York, NY

Arch Ophthalmol. 1997;115(8):1084-1085. doi:10.1001/archopht.1997.01100160254025

In reply  In response to the letter from Laby et al, we have the following comments. First, although they may believe that the Pulfrich phenomenon is an inappropriate measure of motion stereoscopic vision (the motion-in-depth channel), there is no clinical test available to measure motion stereoscopic vision directly and the Pulfrich phenomenon does allow indirect access to this system. Contrary to the opinion of Laby et al, Grimsdale1 thought that the Pulfrich phenomenon was important in baseball hitting; he proposed that it was the probable explanation why players lose their hitting ability with age. Previously, we reported 2 notable relationships between the Pulfrich phenomenon and the ability of professional baseball players.2 We found a notable difference between the accuracy of minor- and major-league players in performing a computerized test based on the Pulfrich phenomenon. More importantly, we demonstrated a notable correlation between the test results and the batting

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