Eyes, Ears, Nose and Throatcommon
A 66-year-old woman is brought to the emergency department at 9 pm with severe right-sided headache, nausea and repeated vomiting that began while she was watching television in a darkened room. She has worn glasses since her forties and describes seeing coloured rings around the streetlights on the way to hospital. The right eye is red, vision in it is reduced to counting fingers, the cornea appears hazy, and the pupil is 5 mm and does not respond to light. Through closed lids the right globe feels distinctly firmer than the left. Which one of the following is the most likely diagnosis?