Like the RB4296, the RB4278 uses a 51mm round plastic front, but its 145mm temples run 5mm shorter, a small difference that changes how the frame sits behind the ear. That distinction matters when ordering replacement lenses, since the curve is matched to the specific mold, not just the eye size.

Each lens in this €25 set is shaped to the RB4278's exact 51-145 dimensions, so it fits the existing frame without gaps or pressure points. No prescription is ground into the lens - it's a direct swap for whatever's scratched or discolored in the frame now.

Frequently asked questions

How hard is it to install replacement lenses myself?

Most Redondo frames use a simple press-fit: flex the frame slightly, seat one edge of the 51mm lens into the groove, then work your thumb around the rim until it clicks into place — no tools needed.

Are these genuine Ray-Ban or Oakley lenses?

No — these are aftermarket lenses, independently made to match the 51mm dimensions of the Ray-Ban 4278. They aren't produced or endorsed by Ray-Ban; they're engineered purely to fit that frame correctly.

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

These lenses are cut to the 51mm eye size and Redondo shape of the Ray-Ban 4278, so they seat into your existing frame's groove without trimming, heating, or any modification on your part.

Can I get polarized or mirrored lenses instead of the flat tint that came with my sunglasses?

Yes. Beyond the standard tint, we stock over 15 lens colours, including mirrored and polarized options for the 4278, so you can upgrade to polarized or mirrored glass in the same 51mm size your Ray-Ban frame already takes.