About the use of cerebral-orbital MRI in diagnosing retrobulbar optic neuritis, our results show that: the sensitivity is 78.64%, the speciality is 75%, positive predictive value is 94.19%, negative predictive value is 59.46%, LR (+) 3.146, LR (-) 0.285Conclusions: Cerebral-orbital MRI is totally believable in diagnosing retrobulbar optic neuritis