refractive error

This is the degree to which you need glasses. Examples of refractive error are nearsightedness or farsightednessAstigmatism is another refractive error.  Your refractive error is obtained with refraction, typically with a phoropter machine in the eye doctor’s office.

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Dr. Timothy Root is a practicing ophthalmologist and cataract surgeon in Daytona Beach, Florida. His books, video lectures, and training resources can be found at:

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