"The marked superiority of Ibn al-Haytham's treatise did not necessarily cause interested readers, even those of intelligence, to reject the Optics out of hand. On the contrary, it was precisely among the most avid disciples of Ibn al-Haytham in the West—the so-called Perspectivists, whose members included Roger Bacon, Witelo, and John Pecham—that Ptolemy's Optics found the most eager audience."