Methods: Case report.

Results: A 67-year-old man presented to our hospital complaining of fl ashes in left eye. Indirect ophthalmoscopic examination revealed giant retinal tear with posterior breaks and multiple horse shoe tears 3600 with posterior vitreous detachment in left eye. Underwent pars plana vitrectomy, membrane peeling, endolaser with silicone oil injection in left eye. Posterior subcapsular cataract developed in left eye after 3 months post-operative period and underwent phacoemulsifi cation with intraocular lens implantation and silicone oil removal. Immediately after surgery his best corrected vision dropped from 6/18 to 5/60 with a central dark blue hue. Extensive workup revealed decreased foveal sensitivity in Humphrey?s Field Analyser and loss of macular peak in mf ERG.

Conclusion: mf ERG may be used as an indicator to estimate prognostic visual outcome after silicone oil removal. Keywords : Silicone oil, multifocal electroretinogram, gaint retinal tear