Figure 3.

Acute exposure to blue light reduced the mean length of processes of intrinsically photoreceptive retinal ganglion cells (ipRGCs). Brown Norway rats were exposed to 12 hours of white light (1000 lx) and 12 hours of darkness for 10 days (control, 6 rats), 12 hours of blue light (1000 lx) and 12 hours of darkness for 10 days (long-term, 9 rats), and blue light (1000 lx) for 2 days (acute, 9 rats). (A) Circles indicate total length of ipRGC processes in a 2.560 mm² area of the retina from one rat; horizontal line shows mean. (B) Dots indicate differences between groups, error bars show 95% confidence intervals for the differences.