Caffeine concentrations in the vitreous Body and exzised epiretinal membranes are measured by gas-chromatography/mass spectrometry. One hour before surgery patients in the caffeine Group will receive 180mg of caffeine. in all patients vitrectomy with Membrane Peeling will be performed, due to epiretinal membranes
Caffeine concentrations in the vitreous Body and exzised epiretinal membranes are measured by gas-chromatography/mass spectrometry.