Prescription Glasses Size Guide

Whether you are purchasing your first pair of prescription glasses or shopping for a replacement set for the pair you’ve currently got taped together, we’ve designed this size guide to make purchasing your next pair of glasses online easier.

 


 

Eyeglasses Frame Measurements

Every frame has 4 key measurements: eyesize, bridge width, temple length, and lens height. If you currently own a pair of glasses, usually the first 3 measurements are printed on the inside of one of your temple arms, or on the inside of the bridge. 

 

Eyesize is the the most critical measurement, as it determines 90% of total frame width. For this reason, it is also the most frequently referenced measurement. If you notice a brand has 2 of the same frames, but one is labeled a 51 and the other a 53 (or similar numbers) following the name, that refers to the width of the lens.

Because most manufacturers do not measure total width of the frame, for general reference you can double your eyesize, and add your bridge.

LENS WIDTH x 2 + BRIDGE WIDTH = ESTIMATED TOTAL WIDTH

This means that a frame sized 51 is approximately 4 mm narrower, total width, than the frame sized 53, or about a half a centimeter. Most companies frames are sized in increments of 2mm if they offer frame size variation.

 


Measuring Your Own Frames

Don't see any numbers that look like the ones pictured above printed on your frames? No worries; let's measure the pair you have. You will need a millimeter ruler for this. If you don't have one nearby, download our printable ruler HERE):

 

 


No Frames To Measure?

Maybe this is your first pair of prescription glasses. Maybe the only pair you had was thrashed by your dog. Regardless, you can still start fresh shopping online by using our handy size guide, in conjunction with our Face Shape Guide.

1. Grab a ruler with either inches or centimeters, preferably centimeters and preferably a flexible one. Don’t have one? Download our printable ruler HERE.
2. You will need to look in a mirror to measure the width of your face from temple to temple. This is where a flexible or printed ruler is helpful, and will provide the most accurate measurement. 
3. Use the following chart to translate your measurement into your ideal lens width:

Temple to Temple Width in Inches

Temple to Temple Width in Millimeters

Suggested Eyeglass Eye Size

4.25”

110mm

47-48mm

4.50”

115mm

49-50mm

4.75”

120mm

51-52mm

5.00”

125mm

53-54mm

5.25”

130mm

55-56mm

5.50”

140mm

57-58mm

5.75”

146mm

59-60mm

 

Have additional questions on how to find the best size glasses frames for you? Call or email one of our Salt City Optics professionals at 1-888-507-1230 or info@saltcityoptics.com and we will be happy to further assist you.