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A 28-year-old man has had a deep ache in the right eye for three days with blurred vision. The right eye is red, most intensely in a narrow ring around the cornea. Shining a torch into the left eye makes the right eye hurt. The right pupil measures 2 mm and the left 4 mm. The cornea is clear on fluorescein staining, the globe is not tender through the closed lid, and intraocular pressure is 12 mmHg on the right and 14 mmHg on the left. He has had morning back stiffness for a year. Which one of the following best explains the appearance of his right eye?
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