This volume deals with the history of optics in the IXth century as well as the transmission of Greek optics in Arabic. It contains the editio princeps and a French translation of the first books written in Arabic on optics and catoptrics, namely, the book On Rays and Rectification of Euclid's Optics, and other treatises written by philosopher and scientist Abū Ishāq al-Kindī. It also contains a new edition and French translation of Liber de causis diversitatum aspectus of al-Kindī.