Prescription Eyewear Size Guide

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

 


 

Frame Measurements

Every frame has 4 key measurements: eyesize, bridge width, temple length, and vertical lens height. If you currently own a pair of glasses, you can typically find the first 3 measurements 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 largeley determines total width. It is also the most frequently used measurement. If you notice a brand has 2 of the same frames, but one has a 51 and one has 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 incriments of 2mm.

  


Measuring Your Own Frames

Can’t locate any numbers that look like the ones pictured above printed on your frames? Here’s how to 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 you’d like some help selecting your first pair of prescription glasses or sunglasses, or maybe the pair you had flew off your head and into the waters blue, never to be seen again. Regardless, yes, you can still start fresh shopping online by using this size guide, in conjunction with our Face Shape Guide.

1. Grab a handy 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

Suggested Lifestyle Sunglass Eye Size

Suggested Sport Sunglass Eye Size

4.25”

110mm

47-48mm

53-55mm

54mm+

4.50”

115mm

49-50mm

55-57mm

56mm+

4.75”

120mm

51-52mm

57-59mm

58mm+

5.00”

125mm

53-54mm

59-61mm

60mm+

5.25”

130mm

55-56mm

61-63mm

62mm+

5.50”

140mm

57-58mm

63-65mm

64mm+

5.75”

146mm

59-60mm

65-67mm

66mm+

 

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.