**2. ERM classification**

Epiretinal membranes are classified as idiopathic, and secondary regarding their etiology. Idiopathic ERM is the most common form. Secondary ERMs are associated with posterior uveitis, retinal vascular occlusions, diabetic retinopathy, trauma, retinal tear or detachment, and their repair, argon laser photocoagulation, cataract surgery [6]. Other risk factors include age, PVD, and history of ERM in the fellow eye. Secondary ERMs tend to occur in younger patients [7]. Clinically, ERMs are classified as cellophane macular reflex or preretinal macular fibrosis according to their severity [8]. Cellophane macular reflex is an early form, including a thin transparent membrane overlying the macula usually clinically asymptomatic, whereas preretinal macular fibrosis is the later form with thickened and contracted membrane causing visual impairment in most eyes.
