1. Visual perception http://en.wikipedia.org/wiki/Visual_perception
2. Sabra , A.I. 2003 Ibn al-Haytham, brief life of an Arab mathematician: died circa 1040 54 55
3. Ibn al-Haytham's criticisms of Ptolemy's Optics;Sabra;J. Hist. Philol.,1966
4. The evolution of eyes and visually guided behaviour;Nilsson;Philos. Trans. R. Soc. London, Ser. B: Biol. Sci.,2009