Sunglasses are measured by three aspects; lens width, bridge width and temple length. Usually labelled on the inner temples (arms) of your frame, these measurements are in millimetres and may be separated by a small square, dash or space. Eg: 63 [] 18 145.

 

If you have well-fitting spectacles or sunglasses, it can be really helpful to take a note of these measurements and use them as a guide for your next new pair. As your facial dimensions won't change, you can even memorise these like your shoe size.

But what if you struggle to find sunglasses that fit?

Scroll below for a helpful guide on how to measure sunglasses for your head size.

 

How do I know my sunglasses size?

To know your sunglasses size, hold a ruler horizontally across your face to measure the distance between your temples in either cm or inches. You can check your ideal sunglasses size via the table below.

Your temples are the soft skin located just outside your eyes towards your ears (above your cheekbones).

It’s best to use a ruler for this measurement because it stays straight like a sunglasses frames; unlike a tape measure which can bend and needs two hands to use.

Face size (cm)	Face size (inches)	Sunglasses size
11.5cm – 13cm	4.5” – 5.1”	Small
13.5cm – 14cm	5.25” – 5.5”	Medium
14.5 – 16cm	5.75” – 6.25”	Large

 

 

 

 

What do the 3 numbers on sunglasses mean?

The 3 numbers on sunglasses denote the key measurements of the frame which include the lens width, bridge width and temple length. In this particular order, these 3 sets of digits are usually labelled on the interior surface of the frame, most commonly on the temple arms. For example 55 [] 22 145

55 = lens width (in mm)

22 = bridge width (in mm)

145 = temple length (in mm)

For a more detailed explanation about how to measure these aspects of a sunglasses frame, scroll below.

 

How do I know my lens width?

To know your lens width, use a plastic ruler (to prevent scratches) to measure one of your sunglasses lenses from their widest outer-edges. This measurement is always taken in millimetres and is the first set of digits labelled on your frame. Eg: 55 [] 22 145.

Adult sunglasses lens widths typically range between 49mm and 63mm.

Lens width	Sunglasses size
49 - 54mm	Small
55 - 57mm	Medium
58 - 63mm	Large

 

 

How do I know my bridge width?

To know your bridge width, measure the inner-most distance between your lenses in millimetres. Then minus this number by 3. Your bridge width is the second set of digits labelled on your frame. Eg: 55 [] 22 145.

For example, if the distance between your lenses (DBL) is 23mm, your frame has a 20 mm bridge width.

Adult sunglasses bridge widths typically range between 14mm and 25mm.

Bridge width	Sunglasses size
14mm - 17mm	Small
18mm - 21mm	Medium
22mm - 25mm	Large

 

 

How do I know my temple length?

To know your temple length, measure (in mm) from the hinge to the bend and then from the bend to the temple tip. Combined, these measurements are your temple length which are the last set of digits labelled on your frame. Eg: 55 [] 22 145.

Adult sunglasses temple length typically range between 120mm and 150mm. However, it is common that temple lengths aren’t always stated by certain brands and manufacturers.

Temple length	Sunglasses size
120mm - 130mm	Small
130mm - 140mm	Medium
140mm - 150mm	Large
>150mm	Extra Large

 

 

What is UV400?

UV400 means sunglasses lenses can protect your eyes up to the 400-nanometre wavelength of ultraviolet (UV) light. With regards to skin and eyecare, UV400 sunglasses protect you from the most dangerous range of electromagnetic exposure. UV400 and UV40 mean the same thing.

UV light sub-type	Frequency (nm)	Danger to eyes & skin
UVA	315 - 400	High
UVB	280 - 315	Medium
UVC	100 - 280	Low

 

Are darker sunglasses better?

No, the darkness of your sunglasses is purely for visual comfort and has no relevance to UV protection. Darker sun lenses simply absorb more visible light which can reduce strain on your eyes. UV protection (UV400) is a mandatory requirement of any sunglasses frame which blocks UVA and UVB light from damaging your eyes.

So you know, the darkness of sunglasses is classified by their level of absorption. Darker lenses absorb more visible light, whilst lighter lenses absorb less. This is what denotes the 5 sunglasses categories.

 

What does CE mean on sunglasses?

CE stands for Conformité  Européenne. (French for "European Conformity.) Spectacles and sunglasses which are compliant with EU health, environment and safety regulations must bear the CE mark. This emblem is usually labelled on the inner surface of the temple or frame, marked via pad printing or laser etching.

 

 

What measurements do I need to order glasses online?

To order glasses or sunglasses online, it’s good to know your ideal lens width, bridge width and temple length. These measurements help you select the correct size of frame for a proper fit. For ordering prescription lenses, you’ll need an up to date prescription and your pupillary distance (the distance between your pupils in mm.)

Hopefully you found this article helpful. Please check out our other sunglasses blogs for more useful advice. Thanks for stopping by.