Tailor the frames to highlight your best features. Also, buy more than one style - you wouldn't own one pair of shoes for every outfit so adopt the same approach with sunglasses. Size, depth and width are everything. Here's a basic guide to the right sunglasses for every face shape.
Big nose - A high bridge will make your nose look longer. If you're worried about this it's best to go for a design with a bridge that's lower set or with a double bridge. This has the effect of significantly shortening the nose.
Round face - A round frame will emphasise the shape of the head and draw attention to your cheeks. It's best to go for something with a rectangular or a long oval frame. You want to go for something that has width without too much depth because this will male your face look slimmer.
Square face - If you have a strong lower jaw you need a frame that will draw attention upwards. Something with a tapered edge angled towards the temple will soften the angles of your face. A traditional Aviator style would work well here - something that is tapered around the top edge of the frame will also have the effect of slimming the forehead.
Long face - You want something that has depth but not too much width. The Ray Ban Clubmaster is perfect and will round off your features, while the depth of the frames will also make your face appear shorter.
Oval face - Lucky you. People with this face type can generally pull off almost any style of sunglasses.
Words by Steve Hudson, Director and Stylist at The Eye Company
Illustration by James Graham