Quantitative assessment of the effects of 670 nm light on the ONL thickness of hyperoxic mice. The average thickness of the ONL was measured along the retinas of the nontreated (NT), hyperoxia-exposed (solid colored lines) and 670 nm-treated (Tr), hyperoxia-exposed mice (broken colored lines) from (A) 0d, 3d, 7d and (B) 10d and 14d groups. The retinas from 0d groups (NT, solid black line and Tr, broken black line) served as controls. (C) At 14d, the ONL of the Tr group (broken green line) in the inferior region was significantly thicker than the NT retinas (solid green line). *Statistically significant difference (p < 0.001) compared to the 670 nm light-treated retinas of the same time point.