For a round face, the key is to add definition and angularity to create a balanced look. Here are some styles that typically work well:

  1. Rectangular Frames: These can help elongate your face and make it look slimmer. The angular lines provide a nice contrast to the roundness of your face.

  2. Square Frames: Similar to rectangular frames, square sunglasses can add some definition to your face. They can make your cheeks appear slimmer and bring a balance to the soft features of a round face.

  3. Cat-Eye Frames: These are excellent for adding a bit of edge and lift to your look. The upswept design of cat-eye sunglasses can draw attention upwards, creating an illusion of a longer face.

  4. Wayfarer Style: This classic design has a slight angular frame which can be flattering for round faces. Wayframes are a versatile choice that balances the roundness without being overly harsh.

  5. Oversized Sunglasses: Large frames can also work well as they cover more surface area and create a sense of balance.

When choosing sunglasses, consider the width of the frame as well. Ideally, it should be slightly wider than your face to create a more balanced look. Also, opting for frames with a bit of color or detailing on the upper part can draw the eye upwards, which is a nice trick to elongate a round face.

Remember, these are guidelines, not strict rules. Personal style and comfort are paramount, so if you find a pair that feels right to you, that's what matters most!