A: H&E staining of paraffin sections (4 µm) from representative retinas treated by I.M. in distilled water (control), 50 mg/L resveratrol, 100 µmol/L NMDA, or 50 mg/L resveratrol+100 µmol/L NMDA. The dark arrows point out the thickness of each layer. B: The thickness of the NFL+GCL for each treatment group; C: The retinal ganglion cell number for each treatment group. Error bars represent standard error of the mean (±SEM); n=6 (unpaired t-test, bP<0.01 and cP<0.001). Original magnification is 40×. Scale bar, 50 µm.