About Your Pupillary Distance (P.D.)
This measurement is necessary to ensure the correct positioning of your lenses within the frame you have chosen. Have a friend* measure the distance from the center of the pupil (black dot) in one eye to the center of the pupil in the other eye. It's like measuring a line connecting the two black dots.
To measure your PD:
- Place the millimeter ruler on the bridge of your nose.
- Have a friend face you about arms length away.
- Have your friend measure the distance between the center of your pupils (the black dots in the middle of your eyes).
- (Or you can do it yourself simply by looking in the mirror).
You can also get this information from your doctor or from a licensed optician.
As a guideline:
- Most adults' PD's are between 55-65.
- Most kids' PD's are between 42-54.
Download a printable Ruler here (pdf)
* NY and MA residents must have their PD measured by a doctor or licensed optician.
If you had your PD measured for you but there's more than one number:
If you have two different numbers, you have either been given both the Distance/Reading or Right Eye/Left Eye:
- If the numbers are higher (and different), like 62/59, then the first number is your Distance PD and the second is your Near PD (for reading-only glasses).
- If the two numbers are lower (and different), like 30.5/31.5, then you had someone take your PD one eye at a time (called "monocular PD"). The first number is for the right eye (O.D.) and the second number is for the left eye (O.S.). If you have a monocular PD available, put it in the "Customer notes" section of the order form and we'll use it.
- If the two numbers are the same, like 30.5/30.5, you can just add them together (61 in this example) and we'll automatically divide it equally.