PD stands for pupillary or pupil distance, the measurement between your eyes from pupil to pupil. Pupil distance can be expressed in two ways: Binocular or Monocular PD. Binocular PD is a single number representing the total distance between your pupils. Monocular PD is a two-number measurement showing the distance from the bridge of your nose to your pupil on each side. FramesDirect.com can use either of these measurements to custom-make your prescription lenses.
Pupil distance measurements are taken at the time of an eye examination, but occasionally the PD information is omitted on an eyeglass prescription. If you don't know your PD measurement, you can contact your optometrist or let us take the measurement for you.
Now, you can get a PD measurement as accurate as the doctor's from our team of expert opticians. Use our PDCapture technology to measure it using nothing more than a headshot.
Follow our step-by-step instructions to send us a photo so we can take your PD measurement.
After you’ve placed your order for prescription eyeglasses or prescription sunglasses on FramesDirect.com, note your order number.
Make sure nothing is blocking your eyes: Remove your eyeglasses, pull your hair back, etc.
Place a CD or DVD under your chin, holding it straight up and down, with the label side facing the camera (as shown in the photo).
Take a photo looking straight ahead at the camera. Your photo should include a FULL view of your head and the CD/DVD.
Send photo to email@example.com.
IMPORTANT: Include your order number in the subject line.
FramesDirect.com can measure a patients' PD (Pupil Distance) from a photograph. Using proprietary facial recognition and imaging technologies, the system automatically recognizes known objects and reflections from the cornea, called Purkinje images.
If no Purkinje image is available, the system is able to recognize the borders of the iris to achieve the same stunning level of accuracy.
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