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Daniel M. Laby, MD; David G. Kirschen, OD, PhD; Bruce Zagelbaum, MD
Karkur, Israel

Arch Ophthalmol. 1997;115(8):1084.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

We read with interest the article by Hofeldt et al¹ in the December 1996 issue of the ARCHIVES. Their study highlights the importance of binocular vision for hitting a baseball. In addition, the authors define a new criterion for ocular dominance in relation to the effect of a 0.6 optical density filter on hitting performance. Finally, the authors compare the Pulfrich phenomenon with the motion-in-depth channel. Although we agree that the motion-in-depth channel (or motion stereoscopic vision) is likely an important factor in a player's ability to successfully hit a baseball, we do not believe that the Pulfrich phenomenon is the appropriate manner by which to demonstrate this.

The authors have equated the motion-in-depth channel with the Pulfrich phenomenon. These 2 binocular phenomena are different in physiologic basis and in the manner tested. To perceive the Pulfrich effect, the subject must fixate on a static target while a ball . . . [Full Text PDF of this Article]

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