Duan Syndrome

Duan syndrome

Doyen's syndrome (syn. Doyan's syndrome, Dunaevsky's syndrome, rare miosis, rare promyaso-, sublevichal displacement), also referred to as supracorical duan's and Doyan's palsy, is a rare eye disease that is caused by movement of the eyeball from position to position and either to a superior position (supracorical diposition), or to a lower position. The syndrome, first described by George McCain in 1876 and named after his sister Agatha Marie Doignay, became famous thanks to an essay by George Thomas Daysmont-Smith in the British Journal of Ophthalmology describing a patient who was identified as suffering from Doayoung's syndrome.