I wrote an article called "Buiding an Eye" which you might want to read.
It's about prosthetic vision, and retinal implants. It hasn't been
published yet but is available at my web site,
http://users.aol.com/salaned/cyberplace.html. Unfortunately, it's still
along way around the bend. Probably there will be nothing useful for
another ten or 15 years.
Good luck,
Steve Edwards
SAlanEd@concentric.net,
SAlanEd@aol.com,
http://users.aol.com/salaned/cyberplace.html