Figure 9.

Accommodative behavior of individual subjects during measurement of divergence and convergence fusional ranges. The data from each subject have been shifted vertically and coded with alternating color for clarity. Subjects showed increases in accommodation during convergence stimulation and decreases in accommodation during divergence stimulation. Large filled circles denote each subject's objective breakpoint obtained from the PR. Large open circles denote subjective blur points when they were reported in naïve adults. Cross symbols indicate that the subjective blur and objective break points occurred at the same prism step.