Figure 2.

Example of filtered vergence data, from a 3-month-old, that were used to estimate phoria. The black vertical line marks the transition from monocular to binocular viewing. The dashed horizontal lines (shifted vertically for clarity) represent the 3.5-second averaging windows identified by an automated sliding algorithm. The difference between these mean alignments represents the phoria. Using this technique phorias could be estimated with 95% CIs of less than or equal to ±2 pd (∼ ±1°).