<prompt> Most common cause of coical blindness ?Unilateral occipital lobe infarctionBilateral temporal lobe infacionBilateral occipital lobe infarctionUnilateral temporal lobe infarction  <response>: Ans. is c i.e., Bilateral occipital lobe infarction COICAL BLINDNESS Coical blindness visual coex disease is produced by bilateral occipital lobe lesions. Unilateral occipital lobe lesions typically produce contralateral macular sparing congruous homonymous hemianopia. Causes of coical blindness include: Vascular lesions producing bilateral occipital infarction are the commonest cause of coical blindness e.g., embolisation of posterior cerebral aeries. Head injury involving bilateral occipital lobes is the second common cause. Tumours, primary e.g., falcotentorial meningiomas, bilateral gliomas or metastatic are rare causes. Other rare causes of coical blindness are migraine, hypoxic encephalopathy, Schilders disease and other leukodystrophies. 