Figure 7.

Optical blur reduces visual salience more for lights than for darks. (a) Relation between correct responses and reaction time measured in one subject with dark (blue) and light targets (red), at the focal plane (left) and with +5 diopters (+5D, right). Same task as in Figure 6. (b) Percentage correct of responses for darks (blue) and lights (red) averaged across 11 subjects as a function of optical blur. (c) The ratio between dark and light accuracy increases with optical blur and the relation can be fitted with a quadratic function (top). *p < 0.05, **p < 0.01, ***p < 0.001. Error bars show the standard error of the mean.