Measure Ypur PD
What is
PUPILLARY DISTANCE? (PD)

Your PD is the distance between the center of each of your pupils. The pupil is the black hole in the center of the iris. The iris is the colored, muscular ring of the eyes. Your PD is measured when you are looking straight ahead. This measurement helps make sure that your prescription lenses are properly centered in your eyeglass frames.

Why is PD important and how does it affect your glasses?

Your pupillary distance measurement is an important part of your eyeglasses prescription. It is needed for correct placement of the lenses in your frames. For example, if your PD measures 60mm, the center of the lenses should be placed 60 mm apart in your frame. This ensures you are looking through the clearest part of the lens for accurate, comfortable vision.

Binocular PD or Monocular PD

There are two primary methods for PD measurement: binocular PD and monocular PD.

Binocular PD is the measurement from pupil to pupil between each eye.

Monocular PD is the measurement from the center of the bridge of your nose to the center of each eye.

Monocular PD is the most accurate since the nose-to-pupil measurement may not be equidistant on both sides.

PD is especially critical when fitting glasses with progressive lenses, which requires precise lens-to-pupil alignment to ensure comfortable vision at all distances.

3 ways to measure your PUPILLARY DISTANCE

Using a Ruler

Ruler

Instructions

  1. Stand about 8" from a well-lit mirror.
  2. Close your right eye.
  3. Align a millimeter ruler to the center of your left pupil across your brow.
  4. Open your right eye.
  5. Measure the distance to the center of your right pupil. This is your binocular PD.
  6. To measure your monocular PD, measure the distance from each pupil to the center of the bridge of your nose. There will be 2 numbers. For example, if the distance from your right pupil to the bridge of your nose is 33 mm and the distance from your left pupil to the bridge of your nose is 31 mm, your monocular PD is 33/31.
Download Vint & York PD Ruler

Tips

  1. Ruler measurements are in millimeters.
  2. Repeat this exercise 2-3 times for best accuracy.
  3. Hold still; the result is more accurate when there is less movement.

What's needed:

  • MirrorMirror
  • RulerRuler
  • PencilPencil

Using your Eyeglasses

Ruler

Instructions

  1. Put on glasses. Have a felt tip marker handy!
  2. Focus on an object at least 20 feet away.
  3. Mark on your right lens directly over the object.
  4. Mark over the object on your left lens.
  5. With both eyes, make sure the markings overlap into a single dot.
  6. Measure the distance between the two dots with a millimeter ruler.
  7. For a monocular PD, measure the distances from each dot to the center of the bridge of the frame.

Tips

  1. Ruler measurements are in milimeters.
  2. Repeat this exercise 2-3 times for best accuracy.
  3. Hold still; the result is more accurate when there is less movement.
  4. If measuring for reading glasses, focus on a close object like a book or computer screen.

What's needed:

  • EyeglassesEyeglasses
  • RulerRuler
  • PencilPencil

Get Help from a friend

Get help from a friend

Instructions

  1. Face your friend and look straight ahead with both eyes open.
  2. Have your friend hold the ruler up to your right so the zero end lines up with the center of your pupil. Measure the distance from the center of your right to the center of your left pupil. The number that lines up with your left pupil is your PD.
  3. Have your friend repeat the process on your left eye by measuring the distance from your left pupil to your right. That's your PD.
  4. To measure your monocular PD, have your friend measure the distance from each pupil to the center of the bridge of your nose.

Tips

  1. Ruler measurements are in milimeters.
  2. Repeat this exercise 2-3 times for best accuracy.
  3. Hold still; the result is more accurate when there is less movement.

What's needed:

  • FriendFriend
  • RulerRuler
  • PencilPencil
  • PaperPaper

How Do You Calculate Near PD For Reading Glasses?

The methods described above measure the distance PD. You can calculate a near PD for reading glasses by subtracting 3mm from your distance PD For example, if your distance PD is 63mm, then your near PD is 60mm.
If you are using Dual PD to calculate near PD, then subtract 15mm from each eye's measurement. For example, if your monocular PD is 33/31mm then your near PD would be 31.5/29.5mm.

Average pupillary distance for

FEMALES

46mm to 65mm

MALES

59mm to 74mm