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