Glen McCormack, OD, PhD
OD, Indiana University
PhD, Physiological Optics, University of California, Berkeley
Dr. McCormack’s laboratory has been studying the relationship of convergence (in-turning of the eyes) to depth perception. A series of studies in the laboratory has revealed that the accuracy of depth judgments based on convergence depends on the rate of change of convergence, but that reaching to viewed objects moving in depth is not influenced by the rate of convergence. These results may be useful in the development of new methods of visual training.
His research has also been studying the relationship of accommodation (changing focus) to convergence in 3D displays. It has been established by other researchers that 3D movies and TV induce more ocular discomfort than 2D movies and TV, and that some of this discomfort is caused by conflicting demands on accommodation and convergence. Two studies conducted in his laboratory indicate that clinical measures of the limits of clear and single vision afforded by accommodation and convergence differ quantitatively and qualitatively from analogous measurements derived from the viewing of 3D action in a stereoscopic display. These results imply that current clinical measures of accommodation and convergence may not tell optometrists which patients will experience visual problems when watching 3D displays. His lab is presently studying those factors that cause a difference of clear and single vision between clinical tests and vision in 3D displays.