For a round face. “Edge up the inherent wholesome, gal-next-door look with shades that add angularity to facial features.” Square or rectangular lenses do the trick for men with round faces too.
For a square face. Think Jackie Onassis, who softened the sharp line of her square jaw with round or oval-shaped frames.
For an oval-shaped face. “Call it the goes-with-anything face shape”: If you have a highly symmetrical, oval-shaped face, you can pull off just about any style that fits your mood.
For a heart-shaped face. Choose lenses, like those in aviator-style Ray-Bans, that mirror the same heart shape—wide at the top and narrower at the bottom.
For a long face. Add a sense of width by wearing cat-eye sunglasses or any large frames that draw a viewer’s attention.
Source: Pittsburgh Post-Gazette