Year 3common
A 62-year-old male presents to the emergency department with a sudden onset of severe right eye pain and vision changes for the past 3 hours, accompanied by a severe headache, nausea, and vomiting. On examination, his right eye is injected, with a hazy cornea and a mid-dilated pupil. The right eye is extremely hard to touch, while the left eye appears normal. What is the most likely diagnosis?