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How do I read my contact lens prescription?

Please note a contact lenses prescription is not the same as an eyeglass prescription. In addition to your lens power, your contact leness prescription contains information relating the size of the lens such as Diameter and Base Curve (B.C). You may also find your prescription on the box of your contacts.Contact lens prescriptions vary based on the type of lens you wear (bifocal, toric, disposable contacts, etc.).

A typical contact lenses prescription looks like this:

Eye Power (Sphere) BC (Base Curve) DIA (Diameter)
OD -2.50 8.6 14.4
OS -2.00 8.6 14.4
OD = Right Eye
OS = Left Eye

Brand Name is also included, eg. Acuvue, Biofinity, Proclear, etc.

Power (Sphere):
The strength of contact lenses which is given as '+' or '-' with a numerical value and a decimal point between -20.00 to +20.00.

BC (Base Curve):
The Base Curve which is the inside curve of your contact lenses. This is a figure with one decimal point, commonly 8.1 up to 8.9. This figure is usually the same for both eyes.

DIA (Diameter):
The Diameter of your contact lenses is a figure with one decimal point such as 13.8, 14.0 or 14.5. The lens diameter fitted is usually the same for both eyes.

This is just for bifocal or multifocal lenses. It will be a number from +1.00 to +3.00 or be labeled high, medium, or low.

If your contact lens prescription is for a colored lens, the color selected would appear in this section.

Astigmatism or Toric Lenses

If you have astigmatism, in addition to the above specification, you will also have CYL (Cylinder) and AXIS on your prescription. It will look like this:

CYL (Cylinder):
Cylinder refers to the strength of you astigmatism. The values may range from -0.75 up to -9.75.

This is also for toric or astigmatism contact lenses, the axis of the correction are given in degrees and ranges from 10º up to 180º.

This is how you order your astigmatism lenses online:

EyesMetro is a licensed and authorized internet retailer for vision products. All our contact lenses are FDA and Health Canada approved. Please submit our receipt to your Insurance provider for reimbursement.
All our contact lenses are FDA and Health Canada approved. Please submit our receipt to your Insurance provider for reimbursement. offers a full range of products including disposable, colored, bifocal, soft contact lenses and RGP. We stock a wide range of brands name contact lenses like Johnson and Johnson, Ciba Vision, Bausch and Lomb, Cooper Vision and Boston RGP lenses. Our top sellers are Acuvue, Air Optix, Focus Dailies, Proclear, Freshlook, and Biofinity. Since there is less overhead for a online business, the savings are passed on to you. Order discount contact lenses and accessories online and enjoy the low prices!

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