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Frame measurements: what do I need to know?

So, you’ve decided to buy a new pair of glasses via Superdrug Glasses Online - hello, welcome! Before we can send you your new stylish specs, you will need to know the correct size frame to order to ensure they are a snug fit when they arrive.

In this handy guide we will teach you how to figure out the frame size you’ll need to ensure a hassle-free buying experience.

The numbers on your glasses

If you’re already a proud owner of a pair of glasses, you may have noticed there are numbers on the arms or on the bridge. These numbers reflect the frame model, colour code and measurements - clever, hey?

They will look a little like this…  55 18 145

55 (mm) represents the width of the lens and will usually range from 40-62mm.

18 (mm) represents the width of the bridge and will usually range from 14-24mm.

145 (mm) represents the overall length of the arm and will usually be in the 110 – 155mm range.

Understanding the measurements 

Bridge width

Getting the bridge width right is probably the most important part to consider when choosing your frames. It should have a comfortable and supportive fit that sits naturally in line with your eye gaze.

Lens width

The lens width is the distance between the vertical sides of a rectangle containing your lenses - simple!

Arm width

The arm length is measured from the very start of the arm which is attached to the frame (known as the dowel point) to the tip of the arm at the end of the drop.

Overall frame width

This is as it sounds; you need to consider the width of 2 lenses plus the bridge width and it’s important to take into consideration the thickness of the frame rim.  If the frame style you’re considering has an out swept lug, you’ll need to consider this too – so, don’t forget!

Note: If this is the first time you have been prescribed glasses, it might be a good idea to try on some frames at your local opticians. While trying them on try noting down the size of the ones that felt the most comfortable. This information is on the inside of the arm of the glasses.

So, you’ve got the size sorted, what about the shape?

Check out our face shape guide here.



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