Figure 2. Electroretinogram b-wave changes after the injection of A: plasmin and SF₆ (group 1), B: plasmin (group 2), or C: SF₆ (group 3). The right eye of each rabbit in group 1 received a pars plana injection of 1 unit of human plasmin and 0.5 ml of SF₆. The right eye of each rabbit in group 2 received an intravitreal injection of 1 unit of human plasmin (0.1 ml) only. The right eye of each rabbit in group 3 received an intravitreal injection of 0.5 ml of SF₆ only. The left eye of each animal in these three groups received a 0.1 ml balanced salt solution (BSS) injection. Electroretinogram (ERG) data showed a transient decrease in the b-wave amplitude within one week after the injections in groups 1, 2, and 3. But the decrease did not reach statistical significance (p value=0.109, 0.285, 0.109 from group 1 to 3 [day 1]; p=0.285, 0.285, 0.593 from group 1 to 3 [day 3]; p=0.593, 0.285, 0.593 from group 1 to 3 [day 7]).Each group consisted of three animals. Data were expressed as mean±SD. One week after the injections, the amplitude returned to baseline.