Depending on your visual impairment (near/farsightedness), drugstore reading classes may help. I am rather seriously farsighted (I use a +3 to +"4 diopter prescription for reading, and my driving glasses are about +2 diopters). Starting with a +2 diopter set of drugstore readers, try and see if they help. Sometimes, they can pull lost vision back into the realm of the possible.
Greg