An epi-retinal membrane (ERM) occurs when a very thin layer of scar tissue forms on the surface of the retina. If this happens at the macula it can result in a distorted or blurred vision. The presence of an ERM can affect the image quality of the fundus photograph making grading difficult. Graders may mistake an ERM for macula exudate which may result in an unnecessary referral.
The aim of the audit is to determine how often ERM occurs in our diabetic eye screening programme and the effect on grading.