RX stands for prescription.
OD stands for right eye. The numbers you see in the OD row apply to your right eye.
OS stands for left eye. The numbers you see in the OS row apply to your left eye.
OU stands for both eyes.
DV stands for distance vision.
NV stands for near vision.
Note: Your prescription may be the same for both eyes, or it may be different.
| SPH (Sphere) |
SPH stands for sphere or spherical power — the basic lens strength.
+ (plus) = farsightedness; – (minus) = nearsightedness. Larger numbers = stronger correction.
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|---|---|
| CYL (Cylinder) |
CYL measures the degree of astigmatism.
Higher numbers = more astigmatism. Appears with AXIS.
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| AXIS |
AXIS shows the orientation of astigmatism (1°–180°).
Used with CYL to show direction of correction.
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| ADD (Addition) |
Extra magnifying power for reading/close-up tasks.
Required for reading, bifocal, multifocal, progressive lenses. Usually same for both eyes.
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| PD (Pupillary Distance) |
Distance between centers of your pupils.
Essential for lens alignment. If missing, we provide a guide to measure.
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| Prism |
Prism corrects eye alignment problems, measured in prism diopters (△).
Base: BU = Up, BD = Down, BI = In, BO = Out.
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Here are a few terms you may see on your prescription and what they mean:
OD: Oculus Dexter – Right Eye
OS: Oculus Sinister – Left Eye
PL (Plano): No spherical correction needed, enter 0
DS (Diopter Sphere): No astigmatism correction for this eye
Please make sure to enter all values as shown in the example. Again, if your prescription doesn't list a PD, you'll need to provide it.
How to measure your PD?
