Case presentation Mr. I was a healthy, outgoing person until he suddenly started complaining about a hurting sensation in his eyes in the presence of bright light. Clinical examination Bilateral acute photophobia No history or present systemic disease Decimal best-corrected visual acuity (> 0.8) and Humphrey visual fields were well-maintained.

Normal optical coherence tomography (OCT) and fundus autofluorescence Mild leakage in fluorescein angiography No pathogenic CSNB-related genes were detected in the exome analysis Outcome:  No progression; no recovery over the long term What examination should be performed for diagnosing this patient’s condition? (Answer is posted in the comment section below!) Source: Rheumatology International