a case report of unilateral severe visual loss along with bilateral optic disc cupping secondary to metastatic brain tumor

purpose: to report a case of unilateral severe visual loss and bilateral optic disc cupping secondary to brain metastasis of bronchogenic carcinoma patient and findings: a 48 year-old woman presented with severe visual loss of left eye without redness or pain or any systemic findings .clinical findings included decreased visual acuity of left eye to 4 m cf and (+3) positive marcus-gunn reflex .there was asymmetric optic disc cupping associated with visual field defect in left eye the neurologic investigations showed a secondary metastatic tumor in the brain from bronchogenic carcinoma. conclusion: before making a diagnosis of normal -tension glaucoma in asymmetric optic disc cupping and normal intraocular pressure, ophthalmologists should rule out neurologic defects and brain tumors.