Chris I did a quick google search for you and came up with a couple of things. Maybe you're aware of them maybe not, I thought I'd share in case you haven't.
First there is a poker place made specificly for blind people called "all in play" it can be found here.
Welcome to All inPlay. Play Accessible Games Online. Try Free (http://allinplay.com/home.html)
Unfortuneately its only free/play money but I would enquire with thier staff and see if they know the status of any available sites or software that could help you get to real money
Here's an article about them in poker news
, it sounds promising.
Blind Man's Bluff: Online Poker for the Blind | Poker News (http://www.pokernews.com/news/2005/11/online-poker-blind.htm)
Here's another article which may be helpful.
BlindNews:COMPANY BUILDS GAME PLAN TO HELP BLIND (http://geoffandwen.com/blind/newsarticle.asp?u_id=345)
And an e-mail adress of some one else who might give better advice.
I don't know if this helps but I applaud your ambition and determination, I have a good friend who is blind. I keep encouraging him to learn his computer better and explore the online world but he's rather comfortable in his situation and don't care to make the effort.
Good luck to you.