乳腺癌已成为威胁现代女性健康的恶性肿瘤之一,随着化疗药物的逐步更新及发展,治疗此疾病的同时,也带来了多种负面影响,特别是对视神经的间接损伤。由于甲钴胺具有促进神经内核酸、蛋白、脂肪代谢的作用,可加速修复损伤的神经组织,改善神经组织传递及代谢障碍,从而起到提高视野的作用,其作用与药物剂量呈正相关,无明显不良反应[1]。我科于2011年—2012年用甲钴胺片(商品名:欧维)预防乳腺癌患者化疗引起的视神经损伤,疗效较好, Breast cancer has become one of the malignant tumors threatening the health of modern women. With the gradual renewal and development of chemotherapeutic drugs, the treatment of this disease has brought many negative effects, especially indirect damage to the optic nerve. Mecobalamin has a neurotrophic effect on nucleic acid, protein and fat metabolism, accelerates repair of damaged nerve tissue, improves nerve tissue delivery and metabolic disorders, and thus plays a role in improving visual field. The effect of mecobalamin is positively correlated with the dosage of the drug, Obvious adverse reactions [1]. Our department from 2011 to 2012 with mecobalamin tablets (trade name: Orwell) to prevent chemotherapy in patients with breast cancer caused by optic nerve injury, the effect is better,