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Certified EssilorLuxottica distributor An international benchmark for Ray-Ban and Oakley replacement parts Over 600,000 glasses restored in 50+ countries New High-precision custom engraving on your lenses 3-year warranty on all replacement parts Compatible Quality and savings to renew your glasses Certified EssilorLuxottica distributor An international benchmark for Ray-Ban and Oakley replacement parts Over 600,000 glasses restored in 50+ countries New High-precision custom engraving on your lenses 3-year warranty on all replacement parts Compatible Quality and savings to renew your glasses

All Ray-Ban replacement lenses →All original Ray-Ban lenses →

Ray-Ban

Original Ray-Ban RB3721 lenses

Bring your Ray-Ban RB3721 glasses back to life with a pair of original lenses, made for this model and bearing the original logo.

Complete pair Polycarbonate Original logo
$ 52.69 from · price per pair
Select the lens size59 mm
Choose the color and coatingChoose a color

Material: Polycarbonate

Optional
Your configurationOriginal lenses RB3721
$ 52.69 per pair
Model
Ray-Ban RB3721
Material
Polycarbonate
Product
Original pair · with Ray-Ban logo
Choose the options to see availability
Quantity: 1 Total $ 52.69
Check the model. This pair is only for the Ray-Ban RB3721.
Before you choose

Find the right lens size for your RB3721

The inscription on the inside of the arm lets you confirm the model and exact lens measurement without visually comparing frames.

Inscription on the inside of the arm: RB3721 ··· 59□·· 145Example for guidance only. The position and order of the codes may vary depending on the frame.

How to read the inscription

In an inscription such as RB3721 ··· 59□·· 145, each part has a purpose:

RB3721ModelMust match this product.
···Frame colorIdentifies the finish of the frame front.
59Lens sizeThis is the size you need to select.
··BridgeThis is not the lens size.
Quick rule: the lens size is the number right before the □ symbol. If you read 59□··, select 59 mm.
Product and model

Ray-Ban RB3721

The RB3721 has a metal frame. This pair of original lenses keeps the geometry, beveling and fit designed for the model; you just need to confirm the exact reference and lens size.

Reference
RB3721
Available lens sizes
59 mm
Identification
Original logo
MaterialPolycarbonate
Compatible frameMetal
Packaging1 pair
ManufacturingOriginal Ray-Ban
Product contents

What you'll receive with your order

1Original right lens with Ray-Ban logo
2Original left lens with RB engraving
3Selected color, coating and lens size
CristalesRepuesto technician checking a lens in the Granada workshop
Specialists since 2018Original product with specialist support
Why choose ReplacementLenses

Origin, compatibility and contents explained before you buy

We work with original replacement parts and help you confirm the model and lens size to reduce mistakes before we prepare your order.

EssilorLuxottica Ray-Ban Certified distributor
since 2018
Certified distributor

ReplacementLenses has been a certified EssilorLuxottica distributor since 2018.

Verifiable original

Ray-Ban pair with the original markings for the variant.

Guided compatibility

We explain where to find RB3721 and how to tell the 59 mm lens sizes apart.

3-year warranty

Coverage against manufacturing defects and after-sales support.

Installation guide

How to replace the lenses on your RB3721

The metal frame uses a rim closed with a screw. Work on a protected surface and avoid forcing the lens or bending the frame front.

Guide specific to the RB3721Step-by-step installation
ReplacementLenses · YouTube
More information

Everything about this replacement part for the Ray-Ban RB3721

Are your Ray-Ban 3721 lenses scratched or have they lost visual clarity? Restore your vision and style with Genuine Replacement Lenses for the 3721 model—your official and secure solution against counterfeits. Protect your investment with Original spare parts, designed precisely for the 3721, ensuring optimal optical performance, perfect fit, and lasting durability.

Polycarbonate Technology & UV Protection

The Genuine Replacement Lenses for the 3721 are crafted from impact-resistant, lightweight polycarbonate, guaranteeing clarity and uniform light transmission. Standard UV protection shields your eyes daily from harmful ultraviolet rays, as expected from Ray-Ban quality.

3721 Model Compatibility

  • Check your frame’s inner temple for the 3721 model code and 59 size, ensuring total compatibility before replacing.
  • Original spare parts by Luxottica, precisely engineered for the 3721 model.
  • Available in: 87 – DARK GREY – PLASTIC, 11 – GREY GRADIENT – PLASTIC, 13 – BROWN GRADIENT – PLASTIC, 71 – DARK GREEN – PLASTIC.
  • Dimensions: Diameter 67 mm / Height 45 mm / Base curve 6.
  • Restore both function and appearance for your Ray-Ban 3721 with only official replacement lenses.
Original Ray-Ban RB3721 replacement lenses
Real experiences

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We answer your questions

FAQ

Is the price for one lens or for the pair?

The price is for a complete pair: original Ray-Ban right and left lenses.

Can I choose a different color from the original?

Yes. You can choose another available variant as long as you select the RB3721 model and the exact lens size of your frame.

Do the polarized versions have a logo?

Yes. On polarized variants, the marking may appear as Ray-Ban P, in addition to the discreet RB engraving.

Will they fit another similar model?

No. Shape doesn't determine compatibility: these lenses are only for reference RB3721 and the lens size you choose.

Search by reference

Find your glasses' reference

Look on the inside of one of the temple arms. That's where you'll find the details needed to find the right replacement part.

Inside of a Ray-Ban temple arm showing reference RB2140, color 901, lens size 50, bridge 22 and arm length 150
RB2140Frame model
901Color code
50Lens size
22Bridge width
150Arm length
●

To find lenses: the model and lens size are usually enough. For arms: we also recommend checking the color and length.