Professor John Daugman of the University of Cambridge Computer Laboratory is the author of this paper on iris recognition. It examines the characteristics of the human iris from a statistical perspective in order to estimate the requirements for accurate identification. Many complex issues of pattern recognition are addressed, such as the problems of isolating the iris and maintaining accuracy regardless of the eye's position. Professor Daugman's home page has numerous other research papers, as well as a general introduction and overviews of basic iris recognition concepts.