SOURCE: "Alkindi's Critique of Euclid's Theory of Vision," in Isis, Vol. 62, No. 214, December, 1971, pp. 469-89.
In the following essay, Lindberg presents an analysis of Euclid's Optica by Alkindi (d. 873), an early Islamic philosopher. Lindberg states that Alkindi "placed himself firmly on the side of Euclid" in many respects, but that the philosopher disagreed with Euclid on the nature of the "visual cone, " one aspect of the mathematician 's theory of vision.
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