Astigmatism can be correctly naturally through either wearing contact lenses or eyeglasses.
When a person has Astigmatism it's most commonly corrected naturally through prescribing of eyeglasses or contact lenses.
Another option to correct Astigmatism is through eye surgery to improve the vision and sometimes it's best to have the eye surgery done to avoid needing to wear the eyeglasses or contacts.
The eye surgery to correct Astigmatism can also help prevent the Astigmatism from becoming worse so I would highly recommend checking into getting eye surgery if the person with Astigmatism is able to go through the eye surgery.