Spectacle frames have a size printed on them, usually on the inside of the side arm or across the inside of the bridge. This will read something like 50/20. The first number, which may range from 44 – 68, is the size in millimetres across the lens. This governs how big the frame itself will be. The second number, ranging from around 12 – 26, is the width in millimetres of the spex  bridge.

The current trend for frame size is around the 48mm mark for women, 50 for men, although fashion and style can influence this. In the Seventies when frames were huge the average size was about 58mm, and for sunglasses it’s usually larger. So what does this mean to you? Unlike with clothes, you won’t always have the same frame size, although looking at the size you currently wear is a good guideline.

Some frames are deliberately styled to look good in different sizes, such as the aviator shape for men, which is worn oversized. In the Eighties when round frames were trendy we wore these super small. It’s a good idea to find an online optician who will let you try at home before you commit to ordering, as this gives you the option to experiment with different looks.