Figure 4. Photobiomodulation enhanced the phagocytic activity in human retinal pigment epithelium cell cultures. A: Oxidative stress reduced the phagocytic activity, and photobiomodulation improved phagocytic activity induced by oxidative stress in hRPE cells. Scale bar=500 μm. B: Oxidative stress reduced the expression of phosphorylated MerTK, and photobiomodulation increased the oxidative stress-induced reduction of phosphorylated MerTK expression. The data are expressed as means ± SEM (n=6) **p<0.01 versus the H₂O₂ only group. In this point, we performed the statistical analysis between H₂O₂ only treated group and photobimodulation group. PBM: photobiomodulation.