Accidental sub-retinal migration of TrypanBlue during pars plana vitrectomy in a human eye

An epiretinal membrane (ERM) is a transparent, avascular, fibro-cellular structure that develops on or above the retinal surface. Contraction of the membrane leads to visual symptoms primarily due to retinal wrinkling and distortion of foveal anatomy. Although mild cases may be asymptomatic, significant membranes cause blurring of vision and metamorphopsia. Surgical removal of the membrane via pars plana vitrectomy is indicated in such cases to eliminate visual distortion. Visual improvement commonly does not occur for several months after surgery.