I can tell you that a learning disability can be fixed (without medicine as some people use).
I recomend you visit www.amfly.com This is a flight school that teaches you how to learn more efficiently so that you don`t have problems with your pilot training. Send them an e-mail, they are very nice people and can give you more information.
Regarding the vision, in the USA as long as you can correct your vision to 20/20 there is no problem. Each country has different rules you can check the web sites Jhooper sent you.
Hope this helps,