To evaluate the visual function of 15 eyes suffering from macular hole the multifocal ERG was used pre and postoperatively. In all the cases a successful vitrectomy has been done with macular hole closure in all the eyes. The Multifocal ERG shows an improvement of retinal response density in regions 1 and 2, even in the 2 eyes with unchanged visual acuity postoperatively. Although a relationship exist between the postoperative retinal response density and the visual acuity, the retinal response density varies between eyes with the same visual acuity.