Within medieval islamic medicine, Hunayn ibn Ishāq and his younger contemporary Tabit ben-Qurra play an important role as translators and commentators of Galen's work. They also tried to compile and summarize a consistent medical system from these works, and add this to the medical science of their period. However, starting already with Jabir ibn Hayyan in the 8th century, and even more pronounced in Rhazes's treatise on vision, criticism of Galen's ideas took on. in the 10th century, the physician 'Ali ibn al-'Abbas al-Majusi wrote: