Figure 2

Pupil sizes (mean + standard deviation) of all subjects under five intensities of blue light (blue bars), green light (green bars), and red light (red bars). There were main effects of color (P < 0.001) and intensity (P < 0.001), and there was an interaction between color and intensity (P < 0.001). Pupil sizes under blue conditions were significantly smaller than those under the other color conditions. Pupil sizes under green conditions, except under the 13-green condition, were significantly smaller than those under red conditions. **P < 0.01.