Maui Jim Kahana MJ640 Replacement Lenses by Revant Optics

	Non-Polarized	Polarized	Elite Polarized
Polarization Cuts 99% of reflected glare, increasing contrast and color perception.	Non-Polarized No	Polarized Yes	Elite Polarized Yes
Oleophobic Coating Repels Oil and Smudges	Non-Polarized No	Polarized No	Elite Polarized Yes
Backside Oil & Water Repellent Coating Repels water and oil left by fingerprints, sweat, and the elements.	Non-Polarized No	Polarized No	Elite Polarized Yes

Replacement Lenses That Don't Feel Like Replacements

Polarized for the Win

Life can be polarizing, but polarized sunglasses aren't. They reduce glare so you see the good times better.

You Only Get One Set of Eyes

Our replacement lenses protect against 100% of those damaging UVA and UVB rays. No staring contests with the sun though.

Tough Enough for Spicy Stuff

We've put our lenses through all kinds of science-y tests and a few not so science-y ones too.

Revant Replacement Lenses for Dark Brown

Make your old Maui Jim Kahana MJ640 lenses like new with our replacement lenses for Maui Jim sunglasses. These lenses perfectly fit Maui Jim Kahana MJ640 sunglasses with the model number MJ640. And because our lenses meet or exceed the quality of your original Kahana MJ640 lenses, you’ll get the same performance you’ve come to expect.

The perfect all-rounders. Our Dark Brown lenses work as well for your go-to hobbies like fishing or driving as they do for hanging out. Plus, their tint makes everything warm and cozy.

Other Features We Like to Nerd-Out About

Best for bright light (15% light transmission)
Warm tint looking through the lens
Anti-scratch protective coating
Lens material: optical polycarbonate

Comes With

1 pair of replacement lenses (left & right) for your Maui Jim Kahana MJ640 sunglasses
Protective microfiber bag for storage and cleaning
Maui Jim Kahana MJ640 lens care instructions
Note: sunglass frame not included

Better Performance.
Half the Price.

Revant
Lenses

Starting at

$24.99

Polarized Available

UV Protection

Impact Resistant

Optically Corrected

Anti-Reflective Available

60-Day Trial

Maui Jim
Lenses

Starting at

$75.00

Polarized Available

UV Protection

Impact Resistant

Optically Corrected

New Maui Jim
Sunglasses

Starting at

$199.00

Polarized Available

UV Protection

Impact Resistant

Optically Corrected

Do I Really Need Polarized Sunglasses?

Polarization cuts glare, increases visibility, and lets you see underwater. In short, it helps you do the things you love better. And once you’ve taken that hairpin without getting blinded or looked a fish straight in the eye, you’ll never go back.

Unmatched Quality

We don’t know everything, but we know lenses. The last ten years have been all about testing, testing, testing. Every single material, coating, and manufacturing method has been evaluated. Only the best are used for our lenses.

High Impact Resistance
Polarized to Block Glare
100% UV Protection

About Our Testing

Find replacement lenses for any activity

A Color for Every Activity

It makes a difference and there are a lot of them. So we put together a short quiz to help you decide.

Questions About Replacing Your Maui Jim Kahana MJ640 Lenses?

Can I replace the lenses in my sunglasses?

Yes, most name-brand sunglasses have lenses that can be replaced. Revant lenses are custom-cut for specific frame models and include installation instructions. In most cases, you can replace the lenses at home in under two minutes.

How do I know if Revant lenses will fit my frame?

Check the model name or number printed on the inside temple of your sunglasses. Revant lenses are made for exact frame models, not just similar styles. If the model on your frame matches the one listed on our product page, you’ll get a perfect fit.

If you're unsure or don't see a model name or number, contact us and we can help make sure you get the right lenses for your sunglasses.

What’s the difference between Revant lenses and my original lenses?

Revant lenses are aftermarket, not OEM, but they’re engineered to meet or exceed the performance of original lenses. Each lens is traced from the original frame model using high-precision digital scanners that capture its unique curvature and edge geometry down to fractions of a millimeter. That means you get a lens cut to fit your frame exactly. No guesswork, no gaps, and no rattle.

Beyond fit, Revant lenses are tested for optical clarity, impact resistance, and durability. We also offer upgrades like polarization, MirrorShield® tints, anti-reflective coatings, and hydrophobic layers that go beyond what many stock lenses provide.

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Limited Edition

Keeper™ Lite Sunglass Case

Maui Jim Kahana MJ640 Replacement Lenses by Revant Optics