Measurement of Na+/K+‐ATPase activity of murine photoreceptor cells after treatment with different concentrations of ZnO nanoparticles. Cell were treated with different concentrations (0, 31.25, 62.5 and 125.0 μmol/L respectively) of ZnO nanoparticles for 6 h, then cells were digested with 0.25% trypsin, washed with PBS, sonicated on the ice for 15 min, and centrifuged at 5000 g at 4°C for 10 min, finally the supernatant was used to determine Na+/K+‐ATPase activity. Data were presented as mean ± SD of n=3