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This is just a sample prescription. Yours will likely look different but should contain the same information.
1Right Eye (O.D.)
OD stands for "oculus dexter" which is Latin for "right eye". The right eye is always listed first on the prescription.
2Left Eye (O.S.)
OS stands for "oculus sinister" which is Latin. We'll give you free shipping if you can guess its English translation. It's always listed second on a prescription.
3Power / Sphere
Sometimes abbreviated to PWR, SPH, or something similar, they all mean the same thing: it's the strength of your prescription.
It will have a plus or minus before it depending on if you're nearsighted (-) or farsighted (+).
4Base Curve (BC)
It's a number between 8 and 10 that measures the curve of the lens. The larger the number, the flatter the lens. The base curve determines how the lens fits on your eye and most brands only produce contacts in a couple of base curve options.
5Diameter (DIA)
The width of the lens in millimeters. Most brands manufacture contacts in one standard size between 13.5 and 15 mm wide.
1Right Eye (O.D.)
OD stands for "oculus dexter" which is Latin for "right eye". The right eye is always listed first on the prescription.
2Left Eye (O.S.)
OS stands for "oculus sinister" which is Latin. We'll give you free shipping if you can guess its English translation. It's always listed second on a prescription.
3Power / Sphere
Sometimes abbreviated to PWR, SPH, or something similar, they all mean the same thing: it's the strength of your prescription.
It will have a plus or minus before it depending on if you're nearsighted (-) or farsighted (+).
4Base Curve (BC)
It's a number between 8 and 10 that measures the curve of the lens. The larger the number, the flatter the lens. The base curve determines how the lens fits on your eye and most brands only produce contacts in a couple of base curve options.
5Diameter (DIA)
The width of the lens in millimeters. Most brands manufacture contacts in one standard size between 13.5 and 15 mm wide.
6Cylinder (CYL)
This is for people with an astigmatism. This is when one part of the eye needs more correction than the rest of the eye. Cylinder is different than your Power measurement and is written with a minus (-) sign.
7Axis
The axis measurement is only for people with an astigmatism. The axis is a number between 0 and 180 and determines the orientation of the cylinder within the lens.
1Right Eye (O.D.)
OD stands for "oculus dexter" which is Latin for "right eye". The right eye is always listed first on the prescription.
2Left Eye (O.S.)
OS stands for "oculus sinister" which is Latin. We'll give you free shipping if you can guess its English translation. It's always listed second on a prescription.
3Power / Sphere
Sometimes abbreviated to PWR, SPH, or something similar, they all mean the same thing: it's the strength of your prescription.
It will have a plus or minus before it depending on if you're nearsighted (-) or farsighted (+).
4Base Curve (BC)
It's a number between 8 and 10 that measures the curve of the lens. The larger the number, the flatter the lens. The base curve determines how the lens fits on your eye and most brands only produce contacts in a couple of base curve options.
5Diameter (DIA)
The width of the lens in millimeters. Most brands manufacture contacts in one standard size between 13.5 and 15 mm wide.
6Add Power (ADD)
Frequently asked questions.
What if my prescription is expired?
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I can't be bothered with this online stuff! Can I still order by phone?
