A patient with sudden severe eye pain, red eye, visual blurring, acuity of only finger counting, nausea, vomiting with a shallow ant chamber that is hazy on shining a torch. What is the diagnosis?

The key is B. Acute closed angle glaucoma. [Sudden severe eye pain, red eye, visual blurring, acuity of only finger counting, nausea, vomiting, shallow anterior chamber that is hazy on shining torch are all classic presentation of acute closed angle glaucoma].