How to read your eyeglasses prescription:
So, you've just had an eye exam and your eye doctor has given you an eyeglass prescription. Here's to how to read it:
Right eye (OD), Left eye (OS), Sphere (S) is the amount of lens power, Cylinder (CYL or C) the amount of lens power in cylinder, and Axis (A) the lens meridian that contains no cylinder to correct astigmatism. You may also have add power which is a magnifying power applied to the bottom part of multifocal lenses to correct presbyopia.
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