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Ophthalmology was one of the foremost branches in medieval Islamic medicine. The oculist or kahhal , a somewhat despised professional in Galen’s time, was an honored member of the medical profession by the Abbasid period, occupying a unique place in royal households. Medieval Islamic scientists considered it normal to combine theory and practice, including the crafting of precise instruments, and therefore found it natural to combine the study of the eye with the practical application of that knowledge. The specialized instruments used in their operations ran into scores. Innovations such as the “injection syringe”, a hollow needle, invented by Ammar ibn Ali of Mosul, which was used for the extraction by suction of soft cataracts, were quite common.
Muslim physicians described such conditions as pannus, glaucoma , phlyctenulae, and operations on the conjunctiva. They were the first to use the words 'retina' and 'cataract'.