How to Read your Prescription

SPH (Sphere)

Refers to the magnitude of the lens correction needed for your prescription lenses. Nearsightedness is represented with a minus sign (-) followed by a number, while farsightedness is represented with a plus sign (+). The larger the number, the stronger your prescription will be. It is recommened for those with strong prescription to order higher-index lenses to prevent the lenses from becomming bulky (chosen in the next section).

CYL (Cylinder)

Indicates the amount of lens power needed to correct astigmatism.


Signifies the orientation of cylindrical power to account for astigmatism. This number ranges from 1-180.

PD (Pupillary Distance)

Refers to the distance between the center of each pupil. The PD measurement helps correctly position the lenses to ensure proper vision and is measured in mm (millimeters). The average PD measurement is roughly 63mm, but will vary between different people.

Measuring your PD is simple

Simply use a ruler, labeled with millimeters, to measure the distance between the center of both pupils; keep in mind your eyes should be looking straight the whole time.

It is recommeneded to have a friend or family member to help you out. Repeat these steps several times to ensure the correct measurement.
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