A wrinkle on the retina -- which is also known as an epiretinal membrane (ERM) or a macular pucker -- is a thin, translucent tissue that develops on the surface of the retina.The retina is the inner layer that lines the inside of the back of the eye and is responsible for converting the light image into an electrical impulse that is then transmitted to the brain. An epiretinal membrane that forms on the retina goes unnoticed by the patient many times, and is only noticed during a dilated eye exam by an eye doctor.Epiretinal membranes can become problematic if they are overlying the macula, whi...