One eye size covers the Ray-Ban RB4263: 55mm, matched to a square plastic front and 145mm plastic arms on this unisex frame. The compatible aftermarket range spans solid, gradient, mirror, and photochromic tints, plus a clear AR lens, so a single frame size still gives you the full color decision without worrying about a size mismatch.

Because the RB4263 only comes in one size, fit isn't really the question when replacing its lenses — tint is. Mirror finishes suit this square shape for daytime glare, while a photochromic grey is the more practical pick if you move between bright outdoor light and shaded or indoor spaces during the same day, and the clear AR option covers anyone using the frame mainly for prescription lenses rather than sun protection, with no need to double-check a second measurement.

Frequently asked questions

Will these lenses actually fit my exact Ray-Ban or Oakley frame?

These lenses are cut to the 55mm eye size and Square shape of the Ray-Ban 4263, so they seat into your existing frame's groove without trimming, heating, or any modification on your part.

Are these genuine Ray-Ban or Oakley lenses?

No — these are aftermarket lenses, independently made to match the 55mm dimensions of the Ray-Ban 4263. They aren't produced or endorsed by Ray-Ban; they're engineered purely to fit that frame correctly.

Do replacement lenses block UV rays as well as the ones they're replacing?

Every lens we sell, including each option among the over 15 lens colours, including mirrored and polarized options, blocks 100% of UVA and UVB radiation, so changing the color or finish on your 4263 never means sacrificing sun protection.

How hard is it to install replacement lenses myself?

Most Square frames use a simple press-fit: flex the frame slightly, seat one edge of the 55mm lens into the groove, then work your thumb around the rim until it clicks into place — no tools needed.