Has your vision changed? Do you have trouble seeing close up, far away, or when reading? An eye doctor can perform a refraction - an eye exam to measure your prescription for eyeglasses or contact lenses. Learn how the test is done & what the results mean:
medlineplus.gov/ency/article/0
![Refractive Errors](https://medlineplus.gov/images/RefractiveErrors_thumb.jpg)
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