Assertion: scientific method's use | /r/CapableOf | disprove ptolemy's theory of vision
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text: Ibn al-Haytham (Alhazen), as well as his predecessor Ibn Sahl, was familiar with Ptolemy's Optics, and used experiments as a means to gain knowledge.[b]:463–65 Alhazen disproved Ptolemy's theory of vision, but did not make any corresponding changes to Aristotle's metaphysics.