A young man with red eye

A man in his 30s had left eye redness for three days. He attended a local clinic where acute conjunctivitis was diagnosed, but symptoms did not improve after applying topical fluorometholone 0.1% and sulfamethoxazole 4% four times daily for two days to treat acute conjunctivitis. He attended the ophthalmology clinic for further treatment. His best corrected visual acuity in the right eye was 20/20; visual acuity in the left eye could not be measured because of severe pain and tenderness. On slit lamp examination (fig 1), there was left eye lid oedema, subepithelial infiltrates, conjunctival chemosis, and excessive mucopurulent discharge on the ocular surface. The patient also reported dysuria and a whitish urethral discharge for one week; and …