ʿAlī b. ʿĪsā (fl. first half of the fifth/eleventh century) was a Christian oculist, famous for his Tadhkirat al-kaḥḥālīn , a comprehensive work on ophthalmology. He was a pupil of the Nestorian physician Abū l-Faraj b. al-Ṭayyib (d. 435/1043), who practised at al-ʿAḍudī hospital in Baghdād and was renowned for his commentaries on Galen. Bar Hebraeus ( Chronicon ecclesiasticum , ed. and trans. Jean Baptiste Abbeloos and Thomas Joseph Lamy, Louvain 1872-7, 3:275-8) provides some information about ʿAlī b. ʿĪsā's life and social