Round and compact, the Ray-Ban RB4297 takes a 51mm aftermarket lens for its plastic front and 150mm arms — the longer arm length relative to lens size is typical of this round-frame family. The color range covers the same solids, gradients, and mirror finishes sold across the catalog, plus a photochromic grey and clear AR lens.

Round frames at a compact 51mm like the RB4297 tend to suit narrower faces better than the larger round sizes do, so if the frame has always sat a little wide, it's worth confirming 51mm is actually the size on the lens currently in the frame rather than assuming round means one universal fit. A green G15 or brown solid tint keeps the round shape closer to its classic styling than a mirror finish would.