Refractive error, also known as refraction error, is a problem with focusing of light on the retina due to the shape of the eye. The most common types of refractive error are nearsightedness, farsightedness,astigmatism and presbyopia, nearsightedness results in far objects being blur, farsightedness result in close objects being blurry, astigmatism causes objects to appear stretched out or blurry, and presbyopia results in a poor ability to focus on close objects. Other symptoms may include double vision, headache,and eye strain.

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