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Glasses can correct most astigmatism.
However contacts do not do as good a job as glasses. The reason for this is that when you have corneal astigmatism the lens in your eye isn't perfectly round, it is more like an egg shape or a football shape. To correct this, the lens in your glasses must be specially ground at the proper angle to ofset the less than round shape of the cornea. If the lens isn't oriented properly with the eye the correction for astigmatism in the lens will make things blurrier instead of clearer. With glasses this isn't a problem as they can only sit on your face one way.