Refraction: Regardless of your age, if your eyes get tired after reading for 15 minutes, you likely require a refractive correction with glasses because the muscle inside your eye that changes the shape of the lens to permit you to read (accomodation) can only hold out so long before tiring. If you are younger than 40 you likely need this correction for all distances. If over 40 you may only require readers.
Answered 1/27/2014
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