Astigmatism, Nystagmus And +6.5 Lenses, What Can I Do To Improve My Vision?

I have been told i have 3 problems with my eyes which rule out laser eye surgery, my astigmatism, i have a nystagmus and my prescription is high at +6.5. On eye tests i am told i should be able to drive but in reality i can not read a number plate at the required distance.
Is there anything i can do/have done to improve my vision so i can drive?