Inclusion Criteria:  Idiopathic ERM Sheduled surgery (vitrectomy with membrane peeling) Age 18 and older Written informed consent for participation in the study Metamorphopsia detected by the Amsler grid BCVA ≥ 0,1  Exclusion Criteria:  Secondary ERM due to retinal tears, retinal detachment, retinal vascular diseases and uveitis Other macular disorders including AMD Previous intraocular surgery except for uncomplicated cataract surgery Pregnancy (pregnancy test will be performed in women of reproductive age)