Analysis of Vergence Control Mechanisms
Past Event Date:
Speaker:Dr. Christopher Tyler
Abstract - The neurophysiology of vergence control has been only partially investigated, so there is much to be learned from the behavioral study of vergence dynamics. This study used a set of symmetrical and asymmetrical vergence tasks to elucidate the variety of vergence control mechanisms. In principle, there are seven possible mechanisms of vergence control: disparity vergence, diplopia vergence, accommodative vergence, proximal/distal vergence, uniocular saccadic vergence, binocular saccadic vergence, anisometric saccadic vergence, and voluntary vergence. Of these, four are well-recognized and have well-established oculomotor dynamics: accommodative vergence (slow), disparity vergence (medium), proximal/distal vergence (medium), and anisometric saccadic vergence (fast). Analysis of 12 kinds of symmetrical and asymmetrical vergence eye movements to LED targets in 34 individuals will be used to elucidate the occurrence and characteristics of this variety of vergence movements and to provide clues as to their underlying mechanisms.