Astigmatism is a refractive error characterized by an irregular shaped cornea, or, in some cases, an irregularly shaped lens. A healthy cornea is evenly and smoothly curved, like a marble, to refract incoming light. With astigmatism, the cornea or lens is curved like an oval or egg, causing problems with how the eye focuses light. Symptoms of astigmatism include blurred vision, distorted vision, eyestrain, squinting and headaches. In this blog post, the trusted eye surgeons at Laser Eye Center™ discuss the possible causes of astigmatism and how it is diagnosed.