Fusional vergence (also: disparity vergence, disparity-driven vergence, or reflex vergence[2]): vergence induced by a stimulus to binocular fusion. Proximal vergence: vergence due to the awareness of a fixation object being near or far in the absence of disparity and of cues for accommodation. This includes also vergence that is due to a subject's intent to fixate an object in the dark.[3]