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Many people have heard the word astigmatism in passing or may even know that they have it, but they may not be clear on the details. This common eye condition affects roughly one-third of the population, and around 70% of all eyeglass and contact prescriptions include an astigmatism correction.

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1. What is Astigmatism?

Astigmatism is a common refractive error within the eye. In people with the error, the cornea has an egg-like shape rather than a mostly circular one. This causes light to focus unevenly on the retina, the light-sensitive tissue in the back of the eye that sends messages to the brain. Because the brain is interpreting these messages into the images that the eye sees, the images have flaws.

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