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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 →

Original product Original lenses Ray-Ban RB4840S
Ray-Ban

Original Ray-Ban RB4840S lenses

Bring your Ray-Ban RB4840S 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 sizeChoose your lens size
Choose the color and coatingChoose a color

Material: Polycarbonate

Optional
Your configurationOriginal lenses RB4840S
$ 52.69 per pair
Model
Ray-Ban RB4840S
Material
Polycarbonate
Product
Original pair · with Ray-Ban logo
Choose the options to see availability
Quantity: 1 Total $ 52.69
3-year warrantyOn all replacement parts
Check the model and lens size. 50 and 52 mm lenses are not interchangeable. This pair is only for the Ray-Ban RB4840S.
Before you choose

Find the right lens size for your RB4840S

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: RB4840S ··· 50□·· 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 RB4840S ··· 50□·· 145, each part has a purpose:

RB4840SModelMust match this product.
···Frame colorIdentifies the finish of the frame front.
50Lens 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:

  • 50□ → 50 mm
  • 52□ → 52 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 RB4840S

The RB4840S has an acetate frame. This pair of original lenses keeps the shape, thickness, beveling and fit designed for this frame; you just need to confirm that the reference and lens size match.

Reference
RB4840S
Available lens sizes
50 and 52 mm
Identification
Original logo
MaterialPolycarbonate
Compatible frameAcetate
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 RB4840S and how to tell the 50 and 52 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 RB4840S

This model has a dedicated guide because its acetate frame requires a special procedure.

We guide you step by stepIf you have any questions during installation, write to us and we'll help you with your model.
Guide specific to the RB4840SStep-by-step installation
Specialist support
More information

Everything about this replacement part for the Ray-Ban RB4840S

Restore Your Ray-Ban RB4840S with Original Replacement Lenses

Bring your Ray-Ban RB4840S sunglasses back to life with these 100% original replacement lenses. Manufactured and distributed by Ray-Ban/Luxottica, these lenses guarantee a perfect fit, official quality, and the signature RB logo when applicable. Choose authenticity and enjoy the full Ray-Ban experience with genuine parts designed specifically for your model.

Whether your original lenses are scratched, damaged, or you simply want to refresh your sunglasses, these replacement lenses are the ideal solution. Maintain the integrity and value of your Ray-Ban RB4840S by trusting only official replacement parts made to the brand’s exacting standards.

Technical Specifications and Materials

  • Compatibility: Exclusively for Ray-Ban RB4840S. Not compatible with other models.
  • Available sizes: 50 mm and 52 mm (check the exact size on your temple arm).
  • Lens diameter: 55 mm and 57 mm depending on variant.
  • Lens material: Plastic (polycarbonate), as specified by Ray-Ban and color variants.
  • Shape: Square.
  • Base curve: 4.
  • Available colors: 87 – Dark Grey, 71 – Dark Green, 4L – Grey Gradient Blue, T3 – Grey Gradient Polarized, T5 – Polar Brown Gradient. Check your original reference for the exact color.
  • Use: Sun.
  • Audience: Adult.
  • Product: Original Ray-Ban replacement.

How to Check Your Exact Model and Size

To ensure compatibility, follow these steps:

  • Locate the model code (RB4840S) on the inside of your temple arm.
  • Verify the size, usually listed next to the model (e.g., 50 or 52).
  • Check the color code, which may appear after the size (e.g., 87, 71, 4L, T3, T5).
  • If in doubt, compare your current lenses’ measurements and shape with the specifications provided.
Original Ray-Ban RB4840S Replacement Lenses
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We answer your questions

FAQ

Are these identical to the lenses my sunglasses came with?

Yes, these are original Ray-Ban/Luxottica replacement lenses, manufactured to the brand’s official standards. There may be minor updates in materials or shades depending on variant and production year, but they always meet the original quality.

What exactly is included in my order?

You will receive one pair of original Ray-Ban RB4840S lenses. The frame is not included.

Are they guaranteed authentic?

All our replacements are genuine and officially distributed by Ray-Ban/Luxottica, ensuring authenticity and quality.

Discover our full range of original Ray-Ban replacements.

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 RB4840S model and the exact lens size of your frame.

How do I know if I need 50 or 52 mm?

Look for the reference on the inside of the arm. In an inscription such as RB4840S ··· 50□··, the number 50 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 RB4840S 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.