Audio Gaming
How do visually impaired people take advantage of games? Well, now there's audio gaming. I found a site that lists some games for the blind and the visually impaired written by blind and visually impaired designers. They come with their own speech synthesizer that allows Windows users with any emulator to play. You can try out a trial version.

Other companies such as bavisoft, GMA games, and Personal Computer Systems also develop these audio games specifically designed for the visually impaired.