How to Enter Prescription
Your prescription (Rx) provides us with your doctor's recommendation for clear and comfortable vision. The numbers on your prescription tell us how strong the glasses need to be.
The top row (O.D.) is the information for your right eye,
The second row (O.S.) is the information for your left eye.
SPH = SPHERE - The amount of long or short sightedness. This value specifies the optical power of a lens.
It always has a plus (+) or a minus (-) sign in front or above it. The lens power for the distance correction will be minus while the correction for near distance and reading will be plus power.
If your eyes does not need correction, sphere will be filled as 0.00, Plano or P.
As you can see in the sample chart, the patient's right eye needs a power of -3.25 and left eye needs a power of -3.50. If the doctor put down P or Plano in this field, you can just choose PLANO when ordering.
CYL = CYLINDER - Combination of Cyl and Axis will determine the measurement of astigmatism.
As you can see in the sample chart, the patient's right eye has a CYCLINDER NUMBER -1.25, the left eye does not have a CYCLINDER NUMBER, the doctor put down as "DS
AXIS - This combines with cylinder to determine the measurement of your astigmatism,
It will be a number between 1 and 180.
It may or may not be written with a degree 'o' symbol after the number.
The doctor sometimes put down three digit number(060) or x+two digit number(x 60), Both means asix is 060
As you can see in the sample chart, the doctor put down a number "060" for the patient's right eye since it has CYCLINDER NUMBER, and he leaves it blank for the patient's left eye, since the left eye does not have a CYCLINDER NUMBER. In that case, you can just leave both the cylinder and axis field blank when ordering.
ADD = ADD POWER This represents how much power gets added to the distance Rx, for your reading-only Rx or for the bottom half of your bifocals/progressive lens.
If you are buying reading glasses, please indicate in the comment field how much you ADD is.
If you are buying bifocal or progressive glasses, then enter this figure into ADD field.
If you do not need a read-only glasses or multifocal glasses, you can just ignore this number.
It is common for doctors to write their prescription in slightly different format, some common prescription abbreviations are:
D.S. or DS = diopters sphere (means you have sphere power only)
X = axis; X 60 means AXIS 090
Pl or pl or plo = PLANO; it's a placeholder for the number zero
O.U. or OU = both eyes
NV or NVO = near-vision or near-vision-only; your doctor is recommending "reading-only" glasses
-50 = -0.50
+100 = +1.00
If you still do not understand ANY part of your prescription, please contact us to ensure everything is entered correctly.