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how to choose the right glasses size

The Perfect Pair: How to Choose the Right Glasses' Size

Are you afraid of making a mistake in choosing the size of your glasses when you shop online? Are you the kind of buyer that goes to the store first to try them on for safety?
From now on, enough with the insecurity, comes the definitive guide on how to choose the right size for your glasses.

Do you struggle to choose the right glasses size when shopping for eyewear online? Are you one of those who prefer to go to the store to try on glasses before making a purchase to avoid any size-related issues? Say goodbye to these concerns as we present to you the definitive guide on selecting the right glasses' size. Read on and learn how to optimize your glasses' fit with our expert tips!

1. Glasses size: key for both comfort and style

Your glasses' size is a crucial factor when it comes to both your comfort and style. Wearing the right size glasses ensures that they fit well and sit properly on your face, providing the necessary support and avoiding discomfort.

A proper fit is especially important if you wear your glasses all day long, as ill-fitting glasses can lead to headaches, pressure points, and even strain on your eyes. Glasses that are too tight can also cause discomfort and leave marks on your skin. On the other hand, glasses that are too loose can slide down your nose, causing constant readjustment and increasing the risk of losing them.

Your glasses size also affects your overall style. Glasses that are too big or too small for your face can throw off the balance of your features and make your face look disproportionate. Choosing the right size of glasses enhances your features, balances your facial structure, and adds a touch of sophistication to your look.

Fortunately, there are many different glasses' sizes available in the market, so you can easily find the perfect fit for your face shape and size. You can also choose from a variety of frame styles, such as round, rectangular, or square, depending on your preference and personal style.

When selecting glasses' size, it's essential to consider your face shape, as different sizes and styles suit different facial structures. For example, if you have a round face, rectangular or square-shaped glasses can create a more elongated appearance, while oval or round-shaped glasses can soften your features. Similarly, if you have a square-shaped face, round or oval glasses can balance out your features and add some softness. Care for some expert advice? Check out the image below!

different face shapes for sunglasses

In conclusion, choosing the right glasses' size is crucial for both comfort and style. Take the time to measure your face, understand your face shape, and experiment with different sizes and styles to find the perfect pair of glasses for you. With the right eyewear, you can see better but also look and feel your best.

2. Understanding glasses' size & measurements

When it comes to finding the perfect glasses size, understanding how eyewear measurements work is crucial. By knowing how to interpret these measurements, you can ensure that you choose the right size and style of glasses that will provide optimal comfort and support for your eyes. There are several key glasses' size measurements that you need to be aware of.

Glasses size chart

The 3 most important measurements are:

Lens width

Bridge width

Temple length

These 3 measurements are always present in the eyewear specifications you find in the product pages of any legit online stores. They should also be printed, engraved, or etched on the inside of the glasses' temple. If you already have a pair of glasses that fits you well, you’re ahead of the game!

Glasses size measurements

1. Lens width (glasses' size chart)

The lens width is the distance between the two outermost points of the lenses, measured in millimeters (mm). This measurement is essential for ensuring that the lenses cover the right area of your eyes and provide optimal vision correction. It is the most important measurement of them all. You definitely want to get it right!

Measure the lens horizontally, at its widest point. Make sure the lens width accommodates your pupillary distance so that your eyes align with the “optical center” of the lens using a ruler or measuring tape. The average lens width for adults is between 48mm and 56mm, but it can vary depending on your face size and shape.

40 - 46
48 - 50
52 - 54 - 56
58 - 60

2. Bridge width (glasses' size chart)

The bridge width is the distance between the two nose pads that support the glasses, also measured in mm. This measurement is crucial for ensuring that the glasses sit comfortably on your nose and don't slide down or pinch. To find the right bridge width for you, measure the width of the bridge of your nose at its widest point. The average bridge width for adults is between 14mm and 20mm, but it can vary depending on your nose shape and size.

Extra Small
Extra Large
Double Extra Large

3. Temple length (glasses' size chart)

Selecting eyewear with the right temple length is essential for comfort and a secure fit. The temple length refers to the distance between the back of the ear and the end of the temple arm that attaches to the frame. It's important to get the correct temple length to avoid discomfort, slippage, or the eyewear feeling too tight.

For adults, the most common temple length measurements range from 135mm to 150mm. However, since everyone's head shape and size is unique, it's crucial to take accurate measurements before selecting eyewear. Getting the right temple length ensures that the eyewear fits comfortably and securely behind the ear, without slipping or causing pressure. Remember to measure from the hinge—where the arm connects in the front— to the spot where the arm begins to bend down around the ear. Then measure from the top of the bend to the bottom tip. Add the two sections together for the total temple arm length.

Extra Small
Extra Large
Double Extra Large

4. Lens height & frame width

Most people focus on lens width and temples length, when trying to find the right glasses' size, but lens height and frame width are equally important. The height of your lenses determines the amount of coverage they provide, and the frame width affects the overall fit and style of your glasses.

  • Lens height is the vertical measurement of your lenses, and it's important to choose the right height to ensure that your eyes are fully covered and protected. If your lenses are too short, they won't provide adequate coverage, leaving your eyes vulnerable to UV rays, wind, and debris. On the other hand, if your lenses are too tall, they can interfere with your natural field of vision.
  • Frame width refers to the distance between the two temples of your glasses. The right frame width will ensure a comfortable and secure fit that won't slide down your nose or pinch your temples. It's also important to consider the style of your glasses when choosing the frame width. A wider frame width can give a bold and trendy look, while a narrower frame width can offer a more classic and sophisticated style.

3. Ray-Ban: a case study on glasses' size

Some eyewear brands make several size variants for one particular model. Some make just one. Some don't include glasses size measurements in their specifics, and some others will do as they please 😛

Knowing this, when shopping online make sure to read product pages well and search for glasses' size info. More times than not there is going to be a table with the relevant information. But sometimes perhaps you'll find the size just next to the model's name. You never know!

We include here a series of popular best-selling Ray-Ban models, so as to show that even within one brand (and not just any brand...) you can find different sizing standards.


When it comes to legendary sunglasses the Ray-Ban Aviator RB3025 is first on the list.

This famous model (gold with green polarized lenses) comes in 3 sizes: 55, 58, 62. This measurement refers to the lens width. But there's no way of knowing the other 2 dimensions!

In this case this is no big deal because bridge width is the same for all 3 variants: 14mm.

Temples, though, are 135mm long on both the 55 and 58, but 140mm on the 62.

How about that?



Ray-Ban Original Wayfarer Classics, model RB2140, are the most recognizable style in the history of sunglasses.

The black RB2140 with polarized lenses comes in only 2 sizes: 50 & 54.

Once again, the number refers to the lens width. But for this model Ray-Ban only makes 150mm long temples. The bridge width is longer, 22mm, for size 50; and shorter, 18mm, for size 54.

Go figure!



Here for another gorgeous RB2140 variant: the unisex 902/57. A classic tortoise frame with brown polarized lenses. This one is the same exact model as the one we just saw but guess what?!

Only one size: 22-50-150.

You're being cheeky, Ray-Ban!


If Ray-Ban has all these differences in sizing, imagine what it could mean to choose the right size when buying eyewear from minor brands! Our suggestion is, first of all, to pay close attention to the information presented on the product page. In case you cannot find sufficient information regarding size, write an email. Eyewear experts and professionals will be surely able to help you. Just a few lines will suffice: "Hey, I am interested in buying this pair of glasses. Can you kindly provide me with accurate information about the dimensions?" That's all it takes!

If you have found a great price (which you will definitely find, if you buy on LookerOnline 😉 ), do not miss the opportunity to get your favorite pair of glasses!

Also, remember: well-trusted online stores like LookerOnline typically offer a 30-day free return policy. Take advantage of it! 

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