Prescription | sgcheapcontactlens.com your one stop solution for all your contact lens need
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Prescription

Prescription

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This is just a sample prescription. Yours will likely look different but should contain the same information.

This is the most common format with clearly printed fields for OD, OS, PWR(D), CYL, AXIS; values are usually entered with computer, but may be handwritten by doctor.

Right Eye (O.D.)
OD stands for “oculus dexter” which is Latin for “right eye”. The right eye is always listed first on the prescription.

Left 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.

Base 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.

Diameter (DIA)
The width of the lens in millimeters. Most brands manufacture contacts in one standard size between 13.5 and 15 mm wide.

Power / Sphere (PWR)
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 (+).