Focal macular electroretinogram before and after ucceful macular hole urgery Original Reearch Article

Purpoe To report change in focal macular electroretinogram before and after ucceful macular hole urgery and to dicu whether preoperative retinal function can predict potoperative viual acuity. Method In thi propective tudy, 28 conecutive eye of 28 patient underwent vitrectomy for tage 2 or 3 full-thickne idiopathic macular hole. Focal macular electroretinogram uing a 4-degree timulu pot were obtained in 24 eye of 28 patient, and thoe uing a 5-degree timulu pot were obtained in 24 eye of 28 patient, to evaluate preoperative and potoperative amplitude and implicit time of the b-wave. Viual acuity wa meaured preoperatively and potoperatively, and reult were tranlated into logMAR (minimum angle of reolution) value. Reult After ucceful macular hole cloure, the b-wave amplitude increaed in 23 of 24 eye meaured with the 4-degree timulu pot and in 19 of 24 eye meaured with the 5-degree timulu pot. Potoperative b-wave amplitude recorded with either timulu pot correlated with potoperative corrected viual acuity. The b-wave implicit time decreaed in 15 of 20 eye meaured with the 4-degree pot and in 13 of 23 eye meaured with the 5-degree pot. Preoperative b-wave implicit time meaured with the 5-degree timulu pot correlated ignificantly (P =.001) with potoperative corrected viual acuity. Concluion Qualitative change (implicit time) i more important than quantitative change (amplitude) in electroretinogram for predicting potoperative corrected viual acuity. The function of the retinal tiue urrounding the hole may affect viual outcome.