Astigmatism occurs when the eye’s natural lens or cornea becomes misshapen. This can create multiple images on the retina resulting in blurry vision far away and up close. Astigmatism is very common, causing blurry or distorted vision, as well as the potential for headaches or eye strain. An optometrist can diagnose astigmatism during a comprehensive eye exam and prescribe treatment, such as glasses, contact lenses, or refractive surgery.