MMP9 and retinal ischemia: As shown in Fig. 6 and Table 6 (n = 5 for Thy-1; n = 3–4 for MMP-9), there were significant differences in the ratios of Thy-1 (0.31 ± 0.15; P = 0.006) and MMP-9 (4.44 ± 0.84; P = 0.003) in the vehicle-pretreated ischemic retina samples 24 h after retinal ischemia compared with the control sham retina (Group 1; Thy-1: 0.99 ± 0.38; MMP-9: 0.75 ± 0.55).