The following are common abbreviations used that you may come across when your reading your prescription (Rx) for your eyewear.SPH or sph = SPHERE power; the "overall" power
D.S. or DS = diopters sphere (means you have sphere power only)
CYL or cyl = CYLINDER power; the amount of astigmatism
X = axis; X 90 means AXIS 090
ADD = how much power gets added to the distance Rx, for your reading-only Rx
or for the bottom half of your bifocals/progressivesPl or pl or plo = PLANO; it's a placeholder for the number zero
O.D. or OD = right eye
O.S. or OS = left eye
O.U. or OU = both eyes
NV or NVO = near-vision or near-vision-only; your doctor is recommending "reading-only" glasses
P.D. or PD = pupillary distance (the distance in between your right pupil and your left pupil), in millimeters (mm)
+100 = +1.00
-50 = -0.50
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