1st January 2024

A 40-year-old male presents with sudden onset severe left brow ache associated with nausea

A 40-year-old male presents with sudden onset severe left brow ache associated with nausea, vomiting and blurred vision after watching a movie at the cinema. He has no past medical or ocular history of note. Examination shows reduced visual acuity in the left with conjunctival hyperaemia and a mid-dilated pupil, which is not reactive to light. What is the most likely diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.