Objective
To explore the changes of multifocal electroret inogram (mERG) before and after retinal detachment surgery and its clinical significance.
Methods
Eighteen patients suffered from rhegmatogen ous retinal detachment underwent mERG before and after surgery using VERIS ScienceTM 4.0. The mERG at different area was compared between preoperative and postope rative surgery.
Results
Preoperatively, the latencies of a wave and b wave in detached area were statistically longer than in attached area (t=4.541 and 6.784, Plt;0.01). The amplitude densities of a wave and b wave were statistically smaller in detached area than in attached area (t=3.680 and 4.257, Plt;0.01). Postoperatively, the amplitude densities of a wave and b wave at fovea, macula, perimacular area and whole tested area significantly improved. Statistical difference was found before and after surgery, but no statistical difference was found in the latencies of a wave and b wave. The amplitude densities of a wave and b wave in the preoperative detached area were statistically larger after surgery than before surgery (Plt;0.05).
Conclusions
After retinal detachment surgery, the responses of mERG improve to some degree. mERG was a promising tool to evaluate the recovery of retinal function after surgery . The amplitude densities are more sensitive than the latencies to evaluation of retinal function.
(Chin J Ocul Fundus Dis, 2001,17:264-267)
