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Toric contact lenses can help patients with an astigmatism. Toric contact lenses are thicker on the bottom to keep them from rotating on the eye. Traditional contact lenses tend to rotate as the wearer blinks but the thicker bottom allows toric lenses to take advantage of gravitational forces to prevent the lenses from rotating on the eye. This is important because toric lenses have two different prescriptions to correct the vision of an eye with astigmatism.