The a- and b-wave latencies as a prognostic indicator of neovascularisation in central retinal vein occlusion

To evaluate the prognostic value of ERG in cases of central retinal vein oc clusion (CRVO) regarding the development of neovascularisation (NV), we stu died 20 patients with unilateral CRVO. Half of them were allocated in the p erfused group and the other 10 finally developed NV and were allocated in t he non-perfused group. Flash ERG was recorded from all patients. Our findin gs suggest that b-wave latency is the most reliable parameter in predicting NV, followed by the a-wave latency. The b/a wave amplitude of ERG ratio do es not seem to be suitable for clinical use.