Choose Your Rx View:

1. Right Eye (O.D.)

   The right eye is always listed first on prescriptions. O.D. stands for “oculus dexter” which is Latin for “right eye”.

2. Left Eye (O.D.)

   The right eye is always listed first on prescriptions. O.D. stands for “oculus dexter” which is Latin for “right eye”.

3. Power / 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 (+).

4. Base Curve (BC)

   The curvature of the lens is known as the base curve. The number, ranges from 8 to 10, indicates the curve of the lens. The higher the number, the flatter the lens.

   The base curve determines how the lens fits on your eye, and typically, most brands offer contacts in only a few base curve options.

5. Diameter (DIA)

   Measured in millimeters, the diameter of the lens is typically between 13.5 to 15 millimeters, a standard size offered by most contact lens brands.

If you wear multifocal lenses

1. Add Power (ADD)

   This is for folks with multifocal contacts. It can be a plus (+) sign with a number or, for certain brands, a description like “high” or “low.”

If you wear toric lenses for astigmatism

1. Cylinder (CYL)

   This is designed for individuals with an astigmatism, where parts of the eye require more correction than others. The Cylinder is different from your Power measurement, and is written with a minus (-).

2. Axis

   This is designed for individuals with an astigmatism, ranging from 0 to 180, this determines the positioning of the cylinder within the lens.