A rare complication of endoscopic sinus surgery: Retinal artery occlusion.

A 60-year-old patient with a history of diabetes mellitus and coronary artery disease was admitted to the eye nose and throat clinic due to complaints of difficulty in breathing. The patient was decided for functional endoscopic sinus surgery with the diagnosis of right nasal polyposis and chronic sinusitis. The patient had right visual loss with the findings of retinal artery occlusion, which is a rare ocular complication seen after functional endoscopic sinus surgery. Although the patient had proper urgent surgical and medical treatment, we did not observe visual improvement. Since this is a very rare condition, we intended to report it in the literature.