India, March 25 -- Buying sunglasses sounds simple until you actually try them on. If you have a round face, chances are you have had this moment. One pair disappears into your cheeks. Another makes your face look even rounder. A third almost works but still feels slightly off.

Round faces have a soft charm. Full cheeks, a gentle jawline and very few sharp edges. The width and length of the face are usually quite similar. The trick with sunglasses is not to match that softness. It is to balance it.

The guiding idea is simple. Stronger lines create contrast. Angular frames introduce a shape where the face is naturally curved. Think of them as the stylistic opposite that makes everything work.

Before frame hunting begins, it helps to con...