Although it offers full-frame/lens packages, Lensabl puts its lens replacement service front and center and ranks highly in search results for “lens replacement.” Its motto is “Your frames, our lenses,” with prices starting at $97 for a basic pair of single-vision lenses. The budget new lens options are decent enough, but it does make a difference (in terms of sharpness and clarity) to step up to lenses more in the $150-plus range.

You upload your prescription online and pick the type of lens you want, and then Lensabl sends you a box with a prepaid return shipping label. You simply mail in your old frame in the box (shipping is free). First-time prescription lens customers get 15% off.

Lensabl does make prescription lenses for Bose Frames and other audio sunglasses.

Notable site features: For $25, you can renew your prescription online through the vision prescription platform Visibly. Not everybody qualifies to take the online eye exam — you have to answer some questions to see if you qualify — but if you do, Lensabl says, “All you need is your computer, [your] smartphone and about 15 minutes of time.” Your results will be reviewed by an eye doctor or optometrist licensed in your state who will then issue you a new prescription via email.

Current deals and coupons: All of Lensabl’s deals and promo codesare displayed on its homepage.

As its name implies, Overnight Glasses can make you a new set of prescription glasses quickly — and really quickly if you’re willing to pay extra for a new pair of glasses. For lens replacements, you get free USPS round-trip shipping. For orders over $150, you get free two-day air shipping. (It takes slightly longer for progressive lens and bifocal lens types.) The quality of the lenses I got was as good as that from other replacement lens sites, so there’s no sacrifice of prescription eyewear quality for speed.

As for new lenses for your current frame, you ship your frames to Overnight Glasses, and it’ll replace your lenses with new ones in as few as five days. The service can do polarized, blue light, transitions and many other types, although progressives require additional time.

If you’re looking for a truly overnight option, there is a 24-hour rush service. Bifocal, no-line bifocal and progressive lenses can take an extra day to manufacture.

Overnight makes lenses for Bose Frames and Amazon Echo Frames audio glasses.

Notable site features: The site has a clean, easy-to-navigate design. There are multiple shipping options.

It’s had shops in the New York area for a while, but ReplaceRxLenses is somewhat new to the online replacement-lens arena. My experience using this retailer was smooth, with a relatively quick turnaround time (about a week, but I was in New York). Its prices are competitive and slightly cheer for some lens types, starting at $55.

The site says what differentiates it from competitors is that it doesn’t have an assembly-line format for fulfilling orders, where one worker is responsible for manufacturing the lenses, another is responsible for tracing the frame and edging the lenses to fit the frame, and another might handle the final eyeglass inspection. “With us, one technician works on a customer’s order from start to finish,” a rep told me. “We believe this format results in a better end product, because there is almost no chance of information being lost or mistakes being made along the way.”

ReplaceRxLenses says it can do a replacement for prescription eyewear or replace nonprescription lenses for Bose, Amazon Echo, Snchat Spectacles and many other audio/smart frames.

Notable site features: The site says it has experience working with frame types and lenses that some other places can’t handle. “We have plenty of experience working with sports frames, wraround frames, vintage frames and extended range prescriptions,” a rep told me. “Many other online replacement services can only work with certain frame types and up to certain prescriptions.”

The site tries to get as much information about a customer’s frame beforehand so it can begin working on the order even before receiving the frame, which helps expedite the order. (I submitted a photo of my frame.)

Current deals and coupons:10% off for new customers in exchange for your email address.

LensDirect says it can make quality lenses for a wide array of frames — “practically any frame unless it just absolutely doesn’t make any fundamental sense like putting a +7.5 prescription on a semi rimless frame” — and has its own machine in-house that can cut the lenses anytime (other retailers have this as well). “We make lens replacement more affordable than our competitors without sacrificing quality,” a rep told me.

LensDirect now makes replacement lenses for Bose and Amazon audio glasses, although it does require you to sign a waiver to work on them.

My lens replacement took about a week, and the lens was of high quality. After using discount codes, the cost for the lenses I got was a bit less than that from some competing sites like Lensabl.

Notable site features: The site has a virtual try-on feature if you’re buying a frame and lens package.

For an older audience (people who wear progressive or bifocal lenses), lens options tend to be more affordable (with discount codes plied), especially for the 1.67 high-index lens, which is 40% thinner and lighter than a standard CR39 lens.

“Even to a younger audience who wants to take a che eyeglass frame and get exactly the lens they need, our CR39 and Polycarbonate lenses start off more affordable even for them,” a rep said.