Borruat FX, et al. - During this study, an examination was performed on patients with optic neuropathy (ON) and microcystic macular edema (MME) that were treated with oral acetazolamide, acting on cellular water transport. Findings did not disclose any change in the visual function with treatment. A substantial improvement was obtained in the MME in eyes with ON due to acetazolamide. Hence, it was deduced that acetazolamide treatment served as a therapeutic option for MME associated with ON but without an impact on the visual function.