Gratis Free shipping on qualifying orders
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 →

Original product Original lenses Ray-Ban RB3757 Kai
Ray-Ban · Kai

Original Ray-Ban RB3757 Kai lenses

Bring your Kai back to life with a pair of original Ray-Ban lenses, made for the RB3757 model and bearing the original logo.

Complete pair Original logo
C$ 68.42 from · price per pair
Select the lens sizeChoose your lens size
Choose the color and coatingChoose a color
Optional
Your configurationOriginal lenses RB3757
C$ 68.42 per pair
Model
Ray-Ban RB3757 Kai
Product
Original pair · with Ray-Ban logo
Choose the options to see availability
Quantity: 1 Total C$ 68.42
3-year warrantyOn all replacement parts
Check the model and lens size. 56 and 59 mm lenses are not interchangeable. This pair is only for the Ray-Ban RB3757.
Before you choose

Find the right lens size for your RB3757

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: RB3757 ··· 56□·· 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 RB3757 ··· 56□·· 145, each part has a purpose:

RB3757ModelMust match this product.
···Frame colorIdentifies the finish of the frame front.
56Lens sizeThis is the size you need to select.
··BridgeThis is not the lens size.

This reference comes in 2 sizes. Find the number right before the □ symbol on your arm and choose that same lens size:

  • 56□ → 56 mm
  • 59□ → 59 mm

The number after the □ is the bridge: it isn't used to choose the lens. Can't read it? Measure your lens from side to side at its widest point; that measurement in millimeters matches the lens size.

Product and model

Ray-Ban RB3757 Kai

The RB3757 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
RB3757
Name
Kai
Available lens sizes
56 and 59 mm
Identification
Original logo
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 RB3757 and how to tell the 56 and 59 mm lens sizes apart.

3-year warranty

Coverage against manufacturing defects and after-sales support.

Meet our team Check compatibility
Installation guide

How to replace the lenses on your RB3757

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 RB3757Step-by-step installation
ReplacementLenses · YouTube
More information

Everything about this replacement part for the Ray-Ban RB3757

Restore Your Ray-Ban RB3757 with Original Replacement Lenses

Bring your Ray-Ban RB3757 sunglasses back to life with these 100% original replacement lenses. Manufactured and distributed by Ray-Ban/Luxottica, these lenses guarantee the same quality, fit, and iconic RB logo as your original pair. They are not compatible or generic lenses, but the official spare parts used in new Ray-Ban sunglasses. If you want to regain the original clarity, protection, and style of your Ray-Ban RB3757, these are the lenses you need.

Authenticity ensures perfect integration with your frame, maintaining the original look and sun protection. Choose the right option for your model and enjoy the peace of mind that comes with an official product, designed for durability and eye protection.

Technical Specifications and Materials

  • Compatibility: Exclusively for Ray-Ban RB3757 (oval shape, adult size).
  • Available sizes: 56 mm and 59 mm diameter. Heights: 34 mm and 36 mm. Check the exact size on the inside of your temple arm.
  • Lens material: High-quality plastic (polyamide), depending on color variant.
  • Available colors:
    • 2 – Green
    • 87 – Dark Grey
    • 73 – Brown
    • 6D – Yellow Mirror Flash Gold
    • 2V – Blue Polarized
    • 69 – Dark Violet
  • Use: Sun protection (non-prescription).
  • Product: Pair of original Ray-Ban lenses, no frame included.
  • Original frame material: Metal (for information, not included in the replacement).

How to Check Your Exact Model and Size

To ensure you select the correct replacement, follow these steps:

  • Find the model code inside your temple arm: it should read “RB3757”.
  • Look for the size, usually listed after the model (e.g., 56 or 59).
  • Identify the color code if you want a perfect visual match.
  • Check that the lens shape matches (oval).

If unsure, compare your current lenses’ measurements with the specifications above.

Original Ray-Ban RB3757 Replacement Lenses | Official Spares
Real experiences

Reviews of these lenses

There are no reviews for this product yet

We only show reviews for this product. If you've already bought it, tell us how the fit, color and installation went.

We answer your questions

FAQ

Are these identical to the lenses my sunglasses came with?

Yes, these are original Ray-Ban/Luxottica replacement lenses, made to the same standards and specifications as your factory lenses. There may be official updates in materials or tints depending on the variant and production year.

What exactly is included in my order?

Your order includes one pair of original Ray-Ban RB3757 lenses. The frame and other accessories are not included.

Are they guaranteed authentic?

We guarantee you will receive original Ray-Ban replacement lenses, officially distributed and fully authentic.

Discover our full range of original Ray-Ban spare parts.

You can also browse all our original Ray-Ban lenses available for other models.

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 RB3757 model and the exact lens size of your frame.

How do I know if I need 56 or 59 mm?

Look for the reference on the inside of the arm. In an inscription such as RB3757 ··· 56□··, the number 56 is the lens size.

Are all colors available in all lens sizes?

Not necessarily. Final availability depends on the lens size and the color and coating combination: when you choose a lens size, you'll only see the colors that exist for it.

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 RB3757 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.