1. Choose a frame that's the opposite shape to your face. For example, if you have a square face, avoid square or sharply angled frames as this will accentuate the sharp angles of your face. Instead, opt for oval or round frames to soften your face.
2. Make sure the following criteria are met: Pupils in the right position within the frame, bridge width giving a comfortable fit, arm lengths just long enough for the bend to caress the ears. Several manufacturers offer an alternative bridge for Asian faces to prevent the frame slipping.
3. Pay attention to your brow line. Contours of the frame should follow the general shape of your brow and should never ride above the brow line.
4. Don't be scared to go bold with the frame colour. Otherwise, the safe option is to choose a colour frame that doesn't contrast too much with your hair colour or skin tone. Subtle but unique colours are now being added to every style as spectacle wearers seek a more individual look without missing out on the current shapes.
5. Using a thinner (and hence lighter) lens will make wearing your glasses a lot more comfortable. Such as Mykita, whose frames are made from incredibly light laser cut steel. These shouldn't cost the earth and some companies such as Iris Optical even offer them free of charge with all frames.
Iris Optical offers a curated selection of the world's best eyewear via its website and three London stores; since opening in 1999, Iris has always offered prescription lenses free of charge with all frames - doing its bit to make fine eyewear more affordable.