FRAME MEASUREMENT GUIDE
Standard Frame Size Coding
The sizes you can see with each of the frames on this website are of the same format. They are all given in millimeters, and the numbers are separated by a /. For example 46/20/135.
The first number is the lens diameter.
The second is the bridge width.
The third will be the arm length.
|Measurements For a Frame
A frame has 4 basic frame sizes ( eye, bridge, temple, vertical ):
- Eye Size - refers to the horizontal width in millimeters of one of the frame's lenses.
- Bridge Size - measurement is the distance in millimeters between the two lenses. It is measured between the two closest points of the two lenses.
- Temple Size - is measured along the length of the temple, from one end to the other, including the bend.
- Vertical Size (B) - refers to the vertical height of an eyeglasses lens, and is measured from the tip to the bottom of the lens aperture of the frame. The measurements are taken from a horizontal line intersecting with the top of the lens, to the horizontal line intersecting with the bottom edge of the lens. The B measurement is only important when ordering multifocal lenses
MEASURING PUPIL DISTANCE (PD)
What is Pupil Distance (or PD for Short)?
It is the distance in millimeters from the center of the pupil of the right eye to the center of the pupil of the left eye. To give you optimum vision, this measurement must be accurate so that the center of the lens is in line with the center of your eye.
To get your pupil distance, you need to ask your optician for this measurement at the time of your eye test, measure it yourself with a mirror, or ask a friend to help you. If your optician measures your PD, make sure it is marked on your prescription.
You can measure your own PD using a mirror and a millimeter ruler
Place the ruler flat against your forehead and with your right eye closed, line up the zero on the ruler with the center of your left pupil.
With your left eye closed, take a reading of the ruler at the center of your right pupil.
If you have difficulty seeing what you are doing, then use a magnifying mirror. If it is easier, line up the outside of the iris of one eye with the inside of the iris of the other eye and use that
We need your distance PD on the order form if you are ordering distance or bifocal glasses, and your near PD on the order form if you are ordering reading glasses
Your near PD is 3mm less than your distance PD, as your eyes move closer together when you read. For adults, the typical PD measurement is from 54 to 66. If you do not supply your PD measurement, we will set distance optical center at 65mm for men and 63mm for women.
Only one measurement is necessary. Any adjustments needed for reading or bifocal glasses will be made by us.
If you enter incorrect prescription information such as an inaccurate papillary distance measurement, you may not be able to see well with your new glasses. We cannot be responsible for mistakes in prescription information provided by you or your optometrist or ophthalmologist. We guarantee that your prescription safety glasses will be made exactly to the specifications that you provide.