Figure 4.

Binocular advantage on the buzz-wire task, % contact time metric, plotted against stereoacuity (reciprocal of stereo threshold in arcsec). The horizontal line shows a ratio of 1 (performance same in both conditions, no binocular advantage); the vertical dashed line shows the median stereoacuity, corresponding to a threshold of 70 arcsec. The mean stereoacuity corresponded to a threshold of 49 arcsec, and the upper and lower quartiles were 100 and 34 arcsec. Data for the six young children who were tested on the “Animals” stereotest are shown with blue diamonds. There was no significant correlation (r = 0.12, n = 40).