eyebobs Square Root Polarized sunglasses are a perfect pick to balance out a round face.
eyebobs Reading Glasses Official Site • Square Root Polarized
Round faces have soft curves with almost equal width and length. To downplay roundness, choose frames with straight or angular lines (think rectangles and squares). Classic colors like black and tortoise shell can minimize fullness by accentuating the lines of the glasses. Thin metal frames (like the ones worn by Michelle Williams) are also a great option since they draw the attention toward the center of the face.
For trendy look to balance a round face, take a page from Drew Barrymore's look book and try eyebobs Square Root polarized sunglasses.