Figure 4.

Average retinal ONL thickness in μm ± the standard deviation after 6 days constant light exposure of 70-120 ft.-C with overhead white fluorescent lighting. Gray bars = unexposed mice at age 48 days; white bars = 6 days of light exposure to mice at 42 days (age 48 days at measurement). Numbers in bars = numbers of mice. P values based on Student’s t-test.