Macular pucker, or epiretinal membrane (ERM), occurs when a fine film of cellophane like material forms on the retinal surface.
Macular pucker describes a condition where a film or membrane forms on the top surface of the retinal layer, and then the film contracts causing distortion of the tissue layers. Another name for this condition is called epiretinal membrane. This film or membrane is composed of glial cells (cells that are responsible for repair) as a response to injury or inflammation, or retinal vascular problems, or trauma. In most cases it can occur without a known cause (idiopathic).
Macular pucker can cause distortion or difficulty reading or images appearing larger than the other eye. In mild cases there may not be any symptoms at all. Most cases of macular pucker can be monitored. In moderate to severe cases where the symptoms are very bothersome to the patient, surgery to remove the membrane helps to improve the symptoms and vision.