Abstract
An experimental paradigm is presented to test the long-standing theory that binocular vergence is supported by an addition of tonic, proximal and accommodative convergence (as measured monocularly) along with a supplemental fusional component. Results show accommodative convergence is less than, and the fusional component greater than, predicted by this traditional theory. An alternative theory is presented which includes the influence of convergence accommodation and which correctly predicts the experimental results.
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