Round sunglasses are originally coined as teashades. These glasses are made up of medium-sized, perfectly round lenses fitted in a slim wire frame and combined with silicone nose pads.

Taking advantage of the new plastic moulding technology, the D-Frame style was first created in the 1950s and the revolutionary modern design was greeted with critical acclaim.

Square glasses are easily identifiable due to their angular corners and are best suited for round, rectangular, oval and some diamond face shapes.