Acuity threshold experiment.

Acuity is plotted versus the fraction of cones remaining and the equivalent dropout percentage under the cone dropout condition (blue) and the pixel dropout condition (red) for 4 subjects. Dashed lines show the fitted regression lines to individual subject data, while the solid lines show the fitted regression line across all 4 subjects for the 2 conditions, where y is the logMAR acuity and x is the logarithm of the fraction of cones remaining in the mosaic. The bold points show the average acuity across subjects with error bars indicating the standard error of the mean.

Stimulus duration experiment.

The difference in fraction correct between the cone and pixel dropout conditions on a 4AFC Landolt C task is plotted versus stimulus duration. Individual subject Δ Performance is plotted with faint lines. The average Δ Performance across those 4 subjects is plotted with dark lines and error bars indicating the standard error of the mean.

Sampling Coverage Analysis.

(a) The average sampling coverage of the Landolt C stimulus across all trials in the acuity threshold experiment is plotted versus the fraction of cones remaining and the equivalent dropout percentage for the cone dropout condition (cyan) and the pixel dropout condition (orange). The dashed lines show the fits to each individual subject’s data, and the solid lines show the fits to the data averaged across subjects, where y is the sampling coverage in decimal form and x is the logarithm of the fraction of cones remaining in the mosaic. (b) The measured acuity for each subject at each dropout percentage is plotted versus the calculated sampling coverage from the corresponding trials. Each point represents one subject at one dropout percentage, either under the cone dropout (cyan) or pixel dropout (orange) condition. The data is fit by a linear relationship (black), where y is the logMAR acuity and x is the sampling coverage in decimal form.

Iso-density contour area comparison between dropout conditions.

(a) Eye motion traces are plotted for the cone dropout condition (blue) and pixel dropout condition (red) in the experiment varying stimulus duration for 4 subjects as indicated in the upper right corner of each column. The iso-density contour line containing 68% of the eye motion data is plotted on top of the eye motion traces. The apparent cutoff for some traces in the horizontal dimension arises when the subject’s eye moves outside of the trackable region. (b) The iso-density contour area (ISOA) enclosed by the contours is plotted for the cone dropout (blue) and pixel dropout (red) conditions. Each symbol indicates a different subject. No significant difference was found between ISOA under the cone dropout and pixel dropout conditions.