Figure 8. Linear regression plot of the change in convergence peak velocity (°/s) of the near steps (solid triangle) and of the far steps (open circles) as a function of the change in phoria level (Δ).

The change in phoria level is defined as phoria after near [far] steps during the near sustained fixation task minus phoria after near [far] steps during the far sustained fixation task. Positive phoria changes refer to an esophoric shift in phoria. Similarly, the change in peak velocity is defined as the peak velocity of steps after the near sustained fixation task minus the peak velocity of steps after the far sustained task. Positive peak velocity changes refer to faster convergence peak velocity values during 16° (near) sustained fixation task compared to the 1° (far) sustained fixation task.