Cat eye frame are with rounded-out edges that work wonders for a square face or diamond shaped face. A round face can benefit from sharper edges, or large frames that curve upwards subtly. All that said though, the rules are never hard and fast: the best option is always to try, try, try on pairs until you work out what is right for your face shape and hairstyle. Get the right pair of 50s-inspired glasses or sunglasses and you will find they can work with many an outfit, from the very modern to the utterly vintage. If you are going for a vintage inspired look, stick to anything from the 40s through to the 60s. While 70s fashion is also seeing a major comeback, it is an era best suited to round frames. If you want to make a strong statement, try a pair of cat-eye or harlequin glasses with diamond-shaped lenses that point sharply out. For an everyday pair pair that will last, keep low-key and subtle with a slight flare out at the edges. Sources: http://www.fashionising.com/trends/b--cat-eye-glasses-sunglasses-4924.html
