How to Read Your Eyeglass Prescription

OD (Oculus Dexter): Refers to your right eye.

OS (Oculus Sinister): Refers to your left eye.

SPH (Sphere): This is the primary correction in your prescription and is used to address nearsightedness (myopia) or farsightedness (hyperopia).

• Minus (-) values are for nearsightedness (myopia).

• Plus (+) values are for farsightedness (hyperopia).
  If your prescription lists "PL" or "Plano," this means there is no prescription for that eye, and you should select 0.00 for this field.

CYL (Cylinder) & Axis: These terms are used to correct astigmatism.

• CYL can have either a positive (+) or negative (-) value.

• Axis refers to the orientation of the astigmatism correction and is measured in degrees from 1 to 180.
  If your prescription lists "DS" (diopters sphere) or "SPH" (sphere) in the CYL field, this indicates no astigmatism, and you should enter 0.00 for both the CYL and Axis values.

ADD (Addition): The ADD value indicates the additional magnification needed for close-up vision, such as for reading or computer work.
It is commonly seen on prescriptions as NV-ADD (Near Vision Addition).
Since this value is typically the same for both eyes, only one ADD field is displayed.

PRISM: This correction is used to fix eye alignment problems, such as double vision or "lazy eye" (amblyopia).
Prism correction is measured in diopters and includes two components:

• Prism power: the amount of correction needed.

• Base direction: the direction in which the correction is applied.
  Not all prescriptions will have a prism correction.

How to Fill Out Your Prescription

Single Vision Prescription
If your prescription is similar to the example below, start by selecting the "Single Vision" lens type. Then, fill in the corresponding values based on the details from your prescription:

Single Vision Prescription with Prism
If your prescription is for single vision with prism correction, follow the same process as above, but be sure to also include the prism details. This typically includes two values:

Progressive Prescription
If you have a progressive prescription, you'll need to fill in the information according to the specific details on your prescription:

Note: Despite the different prescription types, all three examples will use the same prescription lenses for progressive correction.