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For me and my fabulous thrift-store sunglasses, this commonsense advice comes far too late. But hopefully my mistake can help you keep your favorite sunnies from suffering a similar fate in the future.

If you’d rather not carry a case, you can instead keep your sunglasses secured around your neck with a sporty retainer strap or a stylish chain.

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This hard-sided case folds flat to become smaller than a cell phone when not in use. The magnetic closure is strong but not as secure as a zipper.

This might seem obvious, but the best way to keep your sunglasses scratch-free is the old-fashioned way—by storing them in a case when you don’t have them on your face. A hardback case that snaps closed offers your sunglasses more overall protection, but even a soft eyeglass pouch can help to mitigate scrapes.

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Nadorff concluded that you’re better off replacing the sunglasses entirely or learning to live with the scratched lenses, so long as they don’t impair your vision. (You could also get the lenses replaced, but that would require considerable time and effort, and it seems like a last resort.)

“All these methods are going in the right direction and might help slightly for very fine scratches,” Nadorff said. “But they won’t work for deep [ones].”

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Novus Fine Scratch Remover, a cream made with aluminum oxide and propylene glycol monomethyl ether, is meant to remove heavy scratches from acrylic and most plastic surfaces, but the $10 solution also disappointed. Like my homemade toothpaste and baking soda slurries, the Novus formula merely made the scratch less prominent.

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The internet is rife with do-it-yourself hacks claiming that everyday items like toothpaste and baking soda can buff out minor imperfections. There’s also a proliferation of sprays, creams, and pencils specifically marketed as scratch-removing cure-alls, promising to erase scrapes from plastic lenses.

My favorite sunglasses have a funky cat-eye shape, with translucent green frames made of plastic molded into three-dimensional crinkles. It was love at first sight: I noticed them on display in a small thrift shop in St. Louis and immediately ran to the cashier to buy them.

But even though scratched sunglasses can still protect your eyes from sunlight, Nadorff warned that they may be rendered unusable, especially if your lenses are covered in any kind of mirrored or decorative coating. Trying to “repair” a scratch on this type of coating might ruin it by further stripping it away, leaving behind a cloudy haze.

One of my lenses suffered this fate after acetone stripped the coating, but the other DIY techniques I tried didn’t harm the coatings on any of the other sunglass lenses. However, if you really don’t believe me and the expert, and you plan on trying any of the hacks above on your own scratched sunglasses, don’t say we didn’t warn you. Depending on your glasses, you could end up making the problem worse.

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For the next 15 minutes, I thought it was the best $10 I’d ever spent. But then, I stuffed them carelessly in my purse, where they scraped against the sharp teeth of my keys. I’d barely stepped out of the sun before my newfound favorite sunglasses were marred with surface-level scratches on one of the lenses.

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While I was excited to see a noticeable difference after using the LensBuff, I still wouldn’t recommend it. This $14 pencil might be able to change the aesthetics of scratched sunglasses, but the lenses remain scratched in a way that can be visually distracting for the wearer. Buying a new pair of Sungait Vintage Round Sunglasses for $13—that you can see clearly through—is a better use of that money.

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There’s not much you can do at home to fix a pair of scratched plastic lenses. In fact, Nadorff told me that I would likely do more damage to my sunglasses if I tried to buff out the scratches, and even if I did manage to remove them, I’d likely leave a cloudy haze in their place.

To test all of the methods, I needed more scratched lenses to work with—so I purposefully scraped up four pairs of cheap sunglasses, including two pairs of Wirecutter-recommended Sungait sunglasses, with the intention of ruining them. I felt like a criminal as I dragged the lenses against my concrete porch.

A hard-sided case that zips securely closed keeps glasses protected. The convenient carabiner on this model allows you to clip it to your bag for easy access.

I spoke with Georg Nadorff, an optical engineer who has designed lenses for the Ray-Ban division of Bausch + Lomb, to figure out if what I was attempting to do was even possible.

A bottle of Lens Scratch Removal Spray, a $9 mixture of water, coconut oil, and aloe extract, proved to be completely ineffective (not to mention it took about a month to arrive after Wirecutter ordered it).

I had the best results with the LensBuff, a $14 as-seen-on-TV pencil designed to fill in light scratches to make them less noticeable, rather than removing them. The substance is dark and waxy, and the pencil makes it easy to apply. And to my surprise, the scratches were a lot less visible after I applied the LensBuff and rubbed the substance in with a paper towel before wiping it off. I can still see the scratches across my field of vision when I wear the sunglasses, but the effect is less distracting than before.

Nadorff pointed me toward a few scratch-removal kits, though he wasn’t optimistic that they would work. “You’re probably wasting your money,” he said, “but if you’re curious and experimental—and have money to burn—why not try?”

Elissa Sanci is a senior staff writer. She has found that clear ice makes carbonated drinks taste better, and citronella candles don’t work.

Wirecutter is the product recommendation service from The New York Times. Our journalists combine independent research with (occasionally) over-the-top testing so you can make quick and confident buying decisions. Whether it’s finding great products or discovering helpful advice, we’ll help you get it right (the first time).

After performing 120 hours of testing, we think the versatile, high-value Ryders Seventh photochromic glasses are the best outdoor eyewear for most people.

Nevertheless, unable to accept that this could be a problem without a solution, I put a series of at-home DIY scratch-removal techniques and scratch-removing kits to the test to see for myself.

Fortunately, attempting to buff out scratches from your lenses won’t make your sunglasses any less effective. That’s because the UV-blocking properties are activated through the absorption of the UV light in the bulk material of the lens, not by any surface treatment, Nadorff explained.

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After scouring the corners of the internet for the most popular at-home remedies, I decided to put the following methods to the test, using things I already had lying around the house:

He added that you might have more luck restoring scratched glasses lenses on your own by filling the scratch with superglue and then buffing it out with sandpaper, but if done incorrectly, this process could lead to even more scratches. “The solvents in superglue would dissolve the plastic in a plastic lens, or at least craze it, so that wouldn’t work,” he said.

Distraught and determined to restore my glorious new-to-me sunnies, I set off on a mission to learn how to remove scratches from plastic sunglass lenses at home.

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Looking for your forever sunglasses? For just a few bucks, Sungait Vintage Rounds give you all the quality and style of pairs that cost 12 times as much.

The toothpaste and both baking soda slurries dulled the scratches a bit, making them less prominent but failing to eliminate them. The baby oil did nothing for the scratches, leaving behind a greasy mess to clean up. But these techniques didn’t damage the lenses further or leave behind a hazy cast, which felt like a minor victory even though the scratches remained.

I cover a little of everything, from travel gadgets and car-organizing tools to label makers and reusable tumblers. I have an affinity for testing the buzzy products you’ve probably seen clogging your social media feeds—my goal is to figure out which trending items are actually worth your time, and which are a waste of money.

The clear nail polish seemed promising at first—the polish filled in the scratches, making them disappear. But they reappeared when I wiped away the excess polish with acetone, which also left a hazy cast on the lens. This process effectively ruined that pair of sunglasses: Not only was the scratch still obscuring the lens, but I couldn’t see through the cloudy haze, either.

Event in Albacete, Spain by Unveiling Poe on Friday, May 19 2017.

Kohärenz eines Lasers lässt sich somit auch in Einheiten der Linien- breite ... Die breitesten Dioden (zugegebener- maßen keine echten Laser) sind.

As the world’s leading trade fair for smart automation and robotics, automatica brings together all key technologies in the technology hub of Munich. This makes it a meeting point for constructive and visionary exchange between industrial, research and political representatives. And there is more: It offers an overview of developments, topics, innovations, and solutions, thus providing the necessary orientation and investment security in these times of upheaval. So that the vision of gradual advancement from automated to autonomous production may become reality – providing an opportunity to grow for you and your company.