1st April 2022

A 36-year-old man with a history of ankylosing spondylitis presents to A&E

A 36-year-old man with a history of ankylosing spondylitis presents to A&E with a three-day history of a painful and red right eye. There is no visible discharge, although the eye is watery. He denies headache and feels well within himself. On fundoscopic examination, he flinches away from the light.

Which of the following statements about investigations for the most likely diagnosis is true?  

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