Astigmatism can affect vision by causing images to appear blurry or distorted. The irregular shape of the cornea or lens of the eye can cause light to be focused unevenly on the retina, leading to vision problems.  Instead of being a sphere or like a tennis ball the shape is more like an American football.  This can cause symptoms such as: - Blurred vision at all distances - Difficulty seeing fine details or reading small print - Eye strain or fatigue - Headaches - Distorted or wavy vision