Ali ibn Isa al-Kahhal

ʿAlī ibn ʿĪsā al-Kahhal (Arabic: علي بن عيسى الكحال) (fl.

1010 AD), surnamed "the oculist" (al-kahhal) was the best known and most celebrated Arab ophthalmologist of medieval Islam.

He was the author of the influential Tadhkirat al-kahhalin,[3] sometimes translated as Memorandum of the Oculists, the most comprehensive Arabic ophthalmology book to survive from the medieval era.

Ibn 'Isa described and suggested treatment for an array of ocular diseases.

[5] Ibn 'Isa classified epiphora as a result of overzealous cautery of pterygium, and suggested treatments for epiphora based on the stage of the disease – namely treatment in the early stages with astringent materials like ammonia salt, burned copper, or lid paste and a hook dissection with a feathered quill for chronic stages of epiphora.