Astigmatism is a common eye condition that causes blurry or distorted vision. It occurs when the cornea or lens of the eye has an irregular shape, which prevents light from focusing properly on the retina. Astigmatism can be present at birth or develop later in life due to an eye injury, eye disease, or surgery. The symptoms of astigmatism include blurry or distorted vision, eyestrain, headaches, and trouble seeing at night. Astigmatism can be diagnosed through a comprehensive eye exam that includes tests to measure the sharpness of your vision and the shape of your cornea. Treatment options for astigmatism include corrective lenses, such as glasses or contact lenses, or surgery. The most appropriate correction depends on the severity of the astigmatism and the individuals vision needs and lifestyle.