The role of accommodative convergence at the limits of fusional vergence.
Two possible explanations are presented for the mechanism which limits the maximum fusional vergence response. An experimental paradigm is developed to differentiate between these alternatives. Experimental results indicate that the blur generally associated with strong fusional effort is due to convergence accommodation "overdrive." Th important theoretical and clinical implications of this finding are presented.
D000065:Accommodation, Ocular; D000293:Adolescent; D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D005133:Eye Movements; D006801:Humans; D010775:Photic Stimulation / Q000295:instrumentation / Q000379:methods; D011999:Recruitment, Neurophysiological; D014785:Vision, Ocular / Q000502:physiology*