Gass described in 1993 a syndrome characterized by photopsias, acute bilateral loss of outer retinal function, minimal initial fundus changes and an abnormal ERG, which he called acute zonal occult outer retinopathy (AZOOR). This entity shares clinical similarities with MEWDS, acute idiopathic blind spot enlargement, punctate inner choroidopathy, multifocal choroiditis with panuveitis and acute macular neuroretino-pathy . All these conditions predominantly affect young myopic women complaining of photopsias with scotomata and ERG abnormalities, which led Gass to speculate that they could be variants of the same pathology [8,69].
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