When ordering glasses online, you’ll need to enter the details from your eye prescription. This guide will help you understand what each field means and how to correctly enter the information when placing your order.
1. Single Vision Lens Prescription
Select Single Vision if your prescription is for:
- Distance vision
- Reading glasses
- Computer use
Enter the values exactly as shown on your prescription.
Typical fields include:
💡 If your prescription does not include PD, you will still need to measure and enter it before completing your order.
Single Vision Prescription Examples
1. Without Astigmatism (Sphere Only)
| Eye | SPH |
|---|---|
| OD (Right) | -1.50 |
| OS (Left) | -1.25 |
Explanation: Only SPH (Sphere) is present. CYL and AXIS are not required.
2. With Astigmatism
| Eye | SPH | CYL | AXIS |
|---|---|---|---|
| OD (Right) | -1.50 | -0.75 | 180 |
| OS (Left) | -1.25 | -0.50 | 175 |
Explanation: CYL and AXIS values are included to correct astigmatism.
2. Bifocal and Varifocal Lens Prescription
If your prescription includes an ADD value, you will need progressive lenses.
Progressive lenses allow clear vision at:
- Distance
- Intermediate
- Reading
Enter the values exactly as shown on your prescription.
Even if your prescription does not include PD, you still need to measure it before ordering.
Understanding Prescription Terms
OD (Oculus Dexter)
Right Eye
OS (Oculus Sinister)
Left Eye
SPH (Sphere)
Corrects near-sightedness or far-sightedness.
CYL (Cylinder)
Corrects astigmatism.
Axis
Orientation of astigmatism correction.
ADD
Additional magnifying power used for reading.
PD (Pupillary Distance)
Distance between the centers of your pupils.
PL (Plano)
No spherical correction required. Enter 0.00.
DS (Diopter Sphere)
Indicates no astigmatism correction.
How to Measure Your PD at Home
The average adult PD ranges from 54mm to 78mm. Your actual measurement may vary slightly. For best accuracy, measure 2–3 times and use the average.
Step 1
Stand approximately 8 inches (20 cm) away from a mirror, or ask a friend to help you at arm's length.
Step 2
Close your right eye and align the "0" mark on the ruler with the center of your left pupil.
Step 3
Close your left eye and read the number directly over your right pupil. This number is your Total PD.
Step 4
To get two separate PD values (for each eye), measure the distance from each pupil to the center of your nose.
Disclaimer: This information is intended to support your understanding of your prescription, but it should not replace a full eye examination by an eye care professional.
