Astigmatism affects ALL vision. The silver lining in astigmatism is the fact that it affects your far vision about HALF as much as being myopic of the same degree. It's not a case where you might have an astigmatism in one eye and two or three in the other. Astigmatism can be corrected quite easily with glasses or contact lenses. Excimer laser surgery is also an option in certain cases.
Glasses work the same way.