No. of studies Mean difference (95% CI) I 2 (%) for heterogeneityBCVA after 1 week IVR for NPDR without DME (LogMAR) 1 [16 ] −0.06 (−0.18, 0.06) 0.32 Not applicable IVR for NPDR without DME (Snellen) 2 [17 , 19 ] 0.04 (−0.04, 0.12) 0.35 50 0.16 IVB for NPDR with DME (LogMAR) 1 [21 ] −0.13 (−0.51, 0.25) 0.50 Not applicable IVR for NPDR with DME (Snellen) 1 [18 ] 0.16 (0.02, 0.30) 0.02 Not applicable Total: (LogMAR) 2 [16 , 21 ] −0.07 (−0.18, 0.05) 0.25 0 0.73 Total: (Snellen) 3 [17 –19 ] 0.06 (−0.01, 0.14) 0.11 51 0.13 BCVA after 1 month IVB for NPDR without DME (LogMAR) 1 [12 ] −0.24 (−0.34, −0.14) 0.00001 Not applicable IVR for NPDR without DME (LogMAR) 1 [16 ] −0.07 (−0.17, 0.03) 0.15 Not applicable IVR for NPDR without DME (Snellen) 1 [19 ] 0.15 (0.09, 0.21) 0.00001 Not applicable IVB for NPDR with DME (LogMAR) 2 [13 , 21 ] −0.20 (−0.37, −0.03) 0.02 0 0.75 IVR for NPDR with DME (Snellen) 1 [18 ] 0.19 (0.01, 0.37) 0.04 Not applicable Total: (LogMAR) 6 [11 –13 , 15 , 16 , 21 ] −0.14 (−0.19, −0.09) 0.0001 50 0.07 Total: (Snellen) 2 [18 , 19 ] 0.15 (0.10, 0.21) 0.00001 0 0.68 BCVA after 3 months IVB for NPDR without DME (LogMAR) 1 [12 ] −0.04 (−0.14, 0.06) 0.41 Not applicable IVR for NPDR without DME (LogMAR) 1 [16 ] −0.03 (−0.12, 0.06) 0.50 Not applicable IVR for NPDR without DME (Snellen) 1 [19 ] 0.20 (0.15, 0.25) 0.00001 Not applicable IVB for NPDR with DME (LogMAR) 2 [13 , 21 ] −0.13 (−0.24, −0.02) 0.02 0 0.91 IVB for NPDR with DME (Snellen) 1 [14 ] 0.19 (0.02, 0.36) 0.03 Not applicable IVR for NPDR with DME (Snellen) 1 [18 ] 0.23 (0.05, 0.41) 0.01 Not applicable Total: (LogMAR) 6 [11 –13 , 15 , 16 , 21 ] −0.06 (−0.11, −0.01) 0.02 0 0.58 Total: (Snellen) 3 [14 , 18 , 19 ] 0.20 (0.16, 0.25) 0.00001 0 0.94 BCVA after 6 months IVB for NPDR without DME (LogMAR) 1 [12 ] 0.00 (−0.10, 0.10) 1.00 Not applicable IVR for NPDR without DME (LogMAR) 1 [16 ] −0.13 (−0.24, −0.02) 0.02 Not applicable IVR for NPDR without DME (Snellen) 1 [17 ] 0.15 (0.05, 0.25) 0.005 Not applicable IVB for NPDR with DME (Snellen) 1 [14 ] 0.26 (0.10, 0.42) 0.002 Not applicable IVR for NPDR with DME (Snellen) 2 [18 , 20 ] 0.19 (0.10, 0.28) 0.00001 0 1.00 Total: (LogMAR) 4 [11 , 12 , 15 , 16 ] −0.07 (−0.11, −0.02) 0.006 21 0.29 Total: (Snellen) 4 [14 , 17 , 18 , 20 ] 0.19 (0.12, 0.25) 0.00001 0 0.74