Assistive technology for visually impaired and blind people / Marion A. Hersh and Michael A. Johnson (eds.) with David Keating, Stuart Parks, Gunnar Jansson, Brian S. Hoyle, Dean A. Waters, Nicholas A. Bradley, Mark D. Dunlop, Michael May, Charles LaPierre, Elizabeth M. Ball, Tai Fook lim Jerry, Han Leong Goh, Kok Kiong Tan, Gareth Evans, Paul Blenkhorn, Rüdinger Hoffmann, James R. Fruchterman, David Crombie and Roger Lenoir.    London : Springer, [2008]  ©2008 . xxvii, 725 stran