目的　动态观察家兔视网膜缺血 -再灌注损伤后 ERG的 b波的变化。方法　应用前房灌注加压法使前房内压力高至 16 k Pa,维持 1h,在再灌注后的第 2、7、14天分别记录其ERG,与缺血前 ERG相比较 ,观察 b波的变化幅度。结果　缺血 -再灌注后第 2天 ERG的 b波已经开始下降 ,随时间延长 ,b波振幅呈持续性、进行性下降。结论　视网膜缺血 -再灌注损伤在再灌注后呈持续性、进行性改变。 Objective To observe the changes of b wave in ERG after retinal ischemia-reperfusion injury in rabbits. Methods The pressure in the anterior chamber was raised to 16 kPa with anterior chamber perfusion pressure method, and maintained for 1 hour. ERG was recorded on the 2nd, 7th and 14th day after reperfusion, respectively. Compared with the pre-ischemic ERG, the b wave The rate of change. Results The b wave of ERG began to decline on the second day after ischemia-reperfusion, and the amplitude of b wave showed a persistent and progressive decrease with time. Conclusion Retinal ischemia-reperfusion injury is persistent and progressive changes after reperfusion.