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Eyeglass Lens Measurements

Single Vision and Multi-Focal lenses like Progressives, Bifocals and Trifocals require your PD measurement and marking of the the pupil center on each lens with a permanent marker.
  • Pupillary Distance, Pupil Distance or PD

    • If you're ordering lenses for a new frame, you will need to provide your PD (pupil distance). Have your doctor include this on your prescription or have a local eye care professional measure this for you. A PD measurement only takes a few minutes.
    • If the frames you're sending us for replacement lenses have your existing prescription lenses, they have been working well and they are the same lens type as the lenses you're ordering (progressive, bifocal, trifocal or single vision) we can replicate your current measurements on to the new lenses.

    Fitting Height or Segment Height

    • Dot the pupil center on each lens with a permanent marker. This can be done in front of a mirror or by having another person do it for you. Be sure to keep your head still while passing the pen from one eye to the other and keep the dot small. Dotting the lenses is used for the vertical placement of a progressive, bifocal, trifocal and some single vision lenses and is not considered an accurate PD measurement.
    • If your frames do not have any lenses in them at all (prescription lenses, demonstration or dummy lenses) you can place clear tape over the right and left lens opening of the frame as a surface to draw the dots.
    • If you need any further assistance with this procedure please email or call Eyeglass Lens Direct.

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