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Alhazen had shown how light travels in straight lines, so that vision depends on a cone of straight lines extending outward from the eye to the object.

Does the work of Alhazen, author of optical treatises, who understood the weight of air, corrected the Greek misconception or theory of vision, and determined the function of the retina, count for nothing?

More than 800 years ago an Arabian, named Alhazen, explained why rounded or convex glasses make things appear larger when placed before the eye.

One of the oldest dissertations upon the apparent form of the sky was published by Alhazen, an Arab astronomer of the tenth century.

Alhazen is just one of a multitude of scientists working in the Muslim world in centuries past who made significant contributions to the advancement of science.