PD - Pupil Distance
- We need the PD or pupil distance in order to produce the lenses for your new glasses.
- You can obtain the PD from where you purchased your last glasses.
- PD can be 1, 2 or 4 numbers depending on how it was measured.
- If you are unable to obtain your PD, we can email you directions on how to measure it.
Prescription Information
- If you are unsure on how to enter your prescription, you can attach a file copy to your order, or fax it to us at 866-800-8809. Be sure to include the PD - pupil distance.
- Depending on your prescription, you will not find all the listed readings
- OD = Right eye
- OS = Left eye
- OU = Both eyes identical prescription
- Sphere = Power of the lens - nearsighted + farsighted. Sphere will always indicate a + or -.
- Cyl = Correction for Astigmatism. Cyl will also indicate a + or -.
- Axis = Indicates the location of the cyl correction (E.G. x 153)
- DS = Indicates no Astigmatism. No cyl or Axis in the prescription
- SPH = Indicates no Astigmatism. No cyl or Axis in the prescription
- ADD = Correction for near vision used in Bifocals, Progressive and Computer Glasses It will be a + number.
- Prism = Corrects image imbalance. The number will be followed by BI, BO, BU, BD to indicate the direction of the prism.