Purpose: To confirm the predictive factors for postoperative visual acuity and to distinguish idiopathic epiretinal membranes (ERM) from secondary ERM by measuring the full-field electroretinography (ERG) before surgery.
Methods: This is a prospectiv...
Purpose: To confirm the predictive factors for postoperative visual acuity and to distinguish idiopathic epiretinal membranes (ERM) from secondary ERM by measuring the full-field electroretinography (ERG) before surgery.
Methods: This is a prospective study. 61 eyes (36 idiopathic ERM and 25 secondary ERM) of patients with epiretinal membranes who underwent pars plana vitrectomy with membrane peeling were prospectively reviewed. Correlations between preoperative data (full-field ERG and OCT) and postoperative best-corrected visual acuity (BCVA) were investigated using Pearson analysis. Two groups were compared using the t-test. Receiver operating characteristic (ROC) curve analysis was performed to obtain a cutoff value of the parameters of full-field ERG predicting visual recovery (final BCVA ≥20/30) and distinguishing idiopathic ERM from secondary ERM.
Results: Postoperative BCVA was significantly correlated with preoperative BCVA, the implicit time and the amplitude of b-wave in LA 3.0 ERG, the amplitude difference between N1 and P1 in LA 30-Hz flicker ERG, and the sum of the amplitude of OS1, OS2, and OS3 in DA oscillatory potential ERG. Also, the implicit time and the amplitude of b-wave in LA 3.0 ERG, the amplitude difference between N1 and P1 in LA 30-Hz flicker ERG, and the sum of the amplitude of OS1, OS2, and OS3 in DA oscillatory potential ERG significantly differed between idiopathic and secondary ERM groups. The area under the ROC (AUROC) curve was statistically significant when the above parameters of full-field ERG were examined.
Conclusion: The implicit time and the amplitude of b-wave in LA 3.0 ERG, the amplitude difference between N1 and P1 in LA 30-Hz flicker ERG, and the sum of the amplitude of OS1, OS2, and OS3 in DA oscillatory potential ERG objectively evaluating retinal function must be used to predict the postoperative visual acuity and to help distinguish idiopathic ERM from secondary ERM.