Astigmatism is a common vision problem that causes blurred vision. It happens when the eye does not focus light evenly on the retina, the part of the eye that receives and processes images. Astigmatism is very common. In fact, most people have a small amount of astigmatism and don’t even know it. But if you have a lot, it can cause headaches and eye strain and cause problems with both near and far vision. Astigmatism can occur in children and adults and often runs in families. A type of refractive error that occurs when the eye is unable to focus
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