Lensabl | Finding Your Pupillary Distance and Segment Height
How to find your PD (Pupillary Distance) and your Segment Height.
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Finding Your Pupillary Distance and Segment Height

Lensabl: Additional Measurements Required

Received one of these “additional measurements required” emails from us about your order? Or maybe you’re interested in placing an order with us, but are concerned as to how we would be able to get these measurements from you! But fear not! These are both actually incredibly simple measurements to get!

What Do I Need?

For pupil distance, you would only need a credit card and a camera. Finding your segment height requires the same, but you will also need to have the frames you are interested in sending to us handy. Credit cards have a standard size of 85.60 mm × 53.98 mm. We use this information to digitally measure the distance between each pupil, as well as where to begin your reading addition for bi-focal and progressive lenses.

Pupillary Distance (PD):

This is the distance between the center of each pupil. We use this measurement to indicate where the optical center of each lens is. Without an accurate PD measurement, correcting vision can be difficult, as lenses need to be aligned over the center of your pupil for proper clarity. When taking your eye exam, this measurement is usually taken, but is also often times withheld from your script by your doctor. To find this measurement, you may do any one of the following:

1. Check with your doctor.
2. Submit a photo of yourself holding a credit card (sample photo below).

The card should be held by two fingers — placed directly beneath your nose, and pressed against your lips. Please be sure that the camera is eye-level, so that you are not looking downwards or upwards at it. Look directly forward into the camera, so that we may take the most accurate measurement!

Segment Height (SEG):

This is the vertical measurement in millimeters from the bottom of the lens in your frames, to the beginning of the progressive addition on a progressive lens, or the top line of a lined bifocal. If you’d like us to use just below center, or the bottom third of the lens, we may. But it’s always best to get an exact measurement. To get this, you may submit a photo of yourself wearing your glasses (the ones you’ll be sending in), while holding a credit card (sample photo below).

The card should be placed vertically, parallel to your head, as straight as possible. Look straight forward, and directly into the camera. Please hold the card (with two fingers) by the edges, so the full length and width of the card is visible. 

No Credit Card or Camera?

Not able to provide us with a photo? Not to worry! With the help of a friend and a sharpie, you can let us know where each measurement is!

  1. Wear your glasses.
  2. Have a felt-tip marker or sharpie handy.
  3. Focus on a single object in the distance (20+ feet).
  4. Raise the marker to your right lens and place a dot on your lens, directly over the distant object.
  5. Repeat for your left eye.If done correctly, with both eyes open the two dots should overlap into a single dot over the distant object. If not repeat making the markings until they do form a single dot.
  6. Measure the distance between the two dots on your lenses with a millimeter ruler.
  7. That’s your distance PD.
  8. If you need a near PD for reading or computer glasses, just do the same procedure but focus instead on the object you will be looking at, either reading material or computer monitor.

• For segment height, a small horizontal line will suffice. On progressive lenses, you will mark where the center of the pupils are. For bi-focal lenses, you will want to mark where the bottom of the eyelids are.

Can You Take Them From the Existing Lenses?

We do not find that this method is entirely accurate, depending on the condition of the lenses. For your orders, we will require a photo or measurement to work with, and will not take the from the existing lenses.

Simple enough, right?! Order new prescription eyeglass lenses now!