Cancer Plano?
Eye test - refraction; Vision test - refraction; Refraction
Normal Values
If your uncorrected vision (without glasses or contact lenses) is normal, then the refractive error is zero (plano) and your vision should be 20/20.
A value of 20/20 is perfect vision, meaning you are able to read 3/8-inch letters at 20 feet. A small type size is also used to determine normal near vision.
What abnormal results mean
You have a refractive error if you need a combination of lenses to see 20/20....
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