A 30-year-old woman presents to the ophthalmology clinic with a 3-day history of left eye pain, redness, and blurred vision. She reports that the eye pain worsens when exposed to bright lights, and she has noticed increased tearing. There is no history of trauma, and she denies any discharge from the eye or recent upper respiratory infection. She has a past medical history of ankylosing spondylitis but is otherwise healthy. She has not been taking any medications regularly except for ibuprofen as needed for joint pain.