Eyes, Ears, Nose and Throatcommon
A 71-year-old man develops severe pain and blurred vision in his right eye over two hours. He reports coloured haloes around lights and nausea; examination shows a fixed mid-dilated pupil, a hazy cornea and marked ciliary injection. Intraocular pressure is 52 mmHg in the affected eye and 16 mmHg in the other eye. Which diagnosis is most likely?