Fig. 2
From: Morphological alternation and influence of aqueous flare in idiopathic epiretinal membrane
Three zones defined using the ETDRS grid. The ETDRS grid was divided into three zones: a central circle with a diameter of 1 mm (zone 1), a parafoveal circle with a diameter of 3 mm (zone 2), and an outer circle of diameter of 6 mm (zone 3)