A 35 year old Lady Malti has unilateral headache, nausea, vomiting and visual blurring. The diagnosis is

Answer is B (Glaucoma): Presence of visual blurring and female sex suggest a diagnosis of glaucoma over cluster headache amongst the options provided. Differential diagnosis are : Female patient (Glaucoma is about four times more common in females while 80% of patients with cluster headache are males) Visual blurring (Visual blurring is a feature of Glaucoma. Cluster headache has ocular features mainly limited to reddening of eye and homolateral lacrimation but vision has not been mentioned as being affected).