This case involved a 75-year-old female with left-eye epiretinal membrane (ERM) and cataract who developed serious eye disorders during vitreous surgery due to methylrosaniline chloride (MRC) being mistakenly injected and applied to the retina instead of Brilliant Blue G during internal limiting membrane staining. Once realized, MRC was washed out with intraocular infusion solution, and ERM surgery was successfully completed. Postoperatively, a Descemet's fold and corneal edema, marked reduction in corneal endothelial cell density, and inner retina damage and visual field defect extending from the macula toward the temporal side were observed. MRC was found highly toxic to eye tissues. [Ophthalmic Surg Lasers Imaging Retina. 2017;48:1010-1015.].
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