30th April 2024

A 58-year-old woman presents with a sudden onset of severe pain in her right eye that started a few hours ago.

A 58-year-old woman presents with a sudden onset of severe pain in her right eye that started a few hours ago. She describes the pain as a deep, throbbing sensation. She also reports blurred vision and seeing halos around lights. On examination, her right eye appears red, the cornea is hazy, and the pupil is mid-dilated and non-reactive to light.

Which investigation is most likely to confirm the diagnosis?