The Ray-Ban RB4291 is a single-size frame, 58mm, with a square plastic front and 145mm arms, sold as a unisex model. Its aftermarket tint list matches the wider Ray-Ban range — three gradient shades, eight mirror finishes, a photochromic grey, and a clear AR lens for prescription wear — so there's no size guesswork, only a color decision.

Since there's only one size to worry about here, the real decision on the RB4291 is between a fixed tint and the photochromic grey — useful if you wear the frame both driving at dusk and outdoors at midday, since that lens adjusts instead of forcing one fixed darkness. A plain grey or brown solid is the safer pick if you mainly want to match the tint you already have, rather than change the look of the frame.

Frequently asked questions

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 4291, so you can upgrade to polarized or mirrored glass in the same 58mm size your Ray-Ban frame already takes.

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

These lenses are cut to the 58mm eye size and Square shape of the Ray-Ban 4291, so they seat into your existing frame's groove without trimming, heating, or any modification on your part.

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 58mm lens into the groove, then work your thumb around the rim until it clicks into place — no tools needed.

What's the warranty if a lens pops out or discolors after a few months?

All lenses are independently made and carry a 3-year warranty against manufacturing defects — if a 58mm lens fails to seat correctly or the coating degrades on its own rather than from an impact, we'll replace it free.