ʿAlī ibn ʿĪsā al-Kahhal (fl. 1010 AD), surnamed “the oculist” (al-kahhal) was the best known and most celebrated Arab ophthalmologist of medieval islam. He was known in medieval Europe as Jesu Occulist.
He was the author of the influential Memorandum of the Oculists, where for the first time in the literature a surgical anaesthetic is prescribed.
He wrote the landmark textbook on ophthalmology in medieval Islam, Notebook of the Oculists, for which he was known in medieval Europe as Jesu Occulist, with “Jesu” being a Latin translation of “Isa”, the Arabic name for Jesus.