Effects of base-out training on proximal convergence.

Proximal convergence/nearness ratios were determined before and after a program of base-out training. Ratios using base-out vergence, phoria, and base-in vergence data were found to fall after training while the base-out limit increased dramatically. Since the ACA's did not change, it was concluded that it is not the awareness of nearness that is enhanced in such training, but the amplitude of fusional convergence.