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abu 'ali al-hasan ibn al-haytham

abu 'ali al-hasan ibn al-haytham in Science
Ibn al-Haytham (ĭb'ən ěl-hī'thəm), Abu 'Ali al-Hasan Also known as Alhazen
  (ĭb'ən ěl-hī'thəm)   
Arab mathematician who wrote almost 100 works on mathematics, astronomy, philosophy, and medicine, but who is best known for his book on optics, which became very influential in Europe after it was translated in the 13th century. It contained a detailed description of the eye and disproved the older Greek idea that vision is the result of the eye sending out rays to the object being looked at.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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