Fusional vergence: sustained and transient components.
There is evidence to suggest that fusional vergence acts as a two-stage process consisting of fusion-initiating and fusion-sustaining components. The interrelationship of these components was examined by comparing the amplitude of disparity-induced vergence over the operating range of sustained fusional vergence. The results showed that as sustained convergence increased, disparity-induced divergence increased and disparity-induced convergence remained essentially constant. These results are interpreted as indicating independence between the components and that the obtained increase in disparity-induced divergence resulted from an influence of accommodation on uncrossed retinal disparities.
D000065:Accommodation, Ocular; D003867:Depth Perception / Q000502:physiology; D005133:Eye Movements; D006801:Humans; D013285:Strabismus / Q000209:etiology; D013997:Time Factors; D014785:Vision, Ocular / Q000502:physiology*