Author: Maria Hemaya / Editor: Sarah Edwards / Codes: OptC5, OptP3, OptP4, OptP5, SLO1 / Published: 09/02/2022

A 36-year-old male presents to the Emergency Department (ED) with left eye pain and ‘redness’ for one day, especially uncomfortable in bright light. He also reports blurred vision and floaters.

He denies any ocular trauma or substance misuse and hasn’t been particularly unwell recently. He doesn’t wear contact lenses and has a weak prescription for reading glasses.

His vital signs are normal. The eye is soft, with normal extraocular movement, and no evidence of swelling. On examination of the adnexa and anterior chamber, there are no foreign bodies or focal lesions, however you note diffuse ciliary injection and a small irregular left pupil, with mild watery discharge. Fluorescein examination is unremarkable. There is no macular oedema or retinal pathology noted, and he reports some relief after you administer dilating drops.