Many visually impaired computer users successfully use their computers every day. These two sites are great resources for helping blind or visually impaired computer users:
Links:
[1] http://www.acb.org/resources/index.html
[2] http://www.vibug.org/
[3] https://www.paypal.com/cgi-bin/webscr?cmd=_xclick&business=rick@yourpcpartner.com&item_name=Buy