Short answer: all three sell blue light glasses in Canada, but they are not selling the same thing. Amazon.ca is a marketplace of thousands of separate sellers, so the specs, the quality and the return process change from listing to listing. Walmart.ca stocks outside brands such as Cyxus and Cloudfield. Costco sells its blue light eyewear through the optical department, and the ready made pairs are sold as readers, which means magnification. If what you want is a plain non magnified lens with the measurements published, that is a smaller part of the market than it looks.
Most comparisons of this kind end with “buy ours, theirs is bad.” That is not useful and it is usually not true. Costco has opticians on staff and we do not. Amazon can get a pair to you tomorrow and we cannot. What we can do is tell you exactly what each one puts on the shelf, and give you the one number that decides whether any pair will actually fit your face.
If you are new to the category, start with what blue light glasses are and whether they work. This page assumes you already know you want a pair and are deciding where to get it.
What each retailer actually sells
| Amazon.ca | Walmart.ca | Costco.ca | |
|---|---|---|---|
| Who is selling | Thousands of independent sellers plus Amazon itself | Walmart plus outside brands | Costco, through its Optical Centre |
| Typical product | Non prescription frames, enormous range | Branded non prescription frames | Readers with blue light filtering, sold in a two pack |
| Measurements shown | Varies from seller to seller | Not on the brand page we checked | Yes, in full |
| Prescription | Not usually offered | Not usually offered | Yes, and it accepts a prescription from your own optometrist |
| Returns | Usually through the individual seller | Walmart policy | Costco policy, membership required |
One thing in that table deserves credit rather than criticism. The Costco listing we checked publishes the lens width, lens height, bridge, frame width, temple length and weight. That is a complete spec sheet, and it is better than most of what is online. We are not going to pretend otherwise.
Costco’s optical page also confirms you do not need to have your eye exam there to buy eyewear, and that it accepts current prescriptions from outside doctors. If you need a prescription with a blue light filter, that is a genuinely good route and we cannot serve you at all. We only sell non prescription frames.
The Costco detail most people miss
The ready made Costco pairs are sold as readers, in the reading glasses category. Readers are magnified. That magnification is built for something held about 35 centimetres from your face, like a book or a phone.
Your monitor is not there. It sits closer to 60 centimetres. Put reading magnification on at monitor distance and the screen can go soft, and anything past it goes blurry. If you wear them all day at a desk you may end up leaning in, which is the posture that causes the neck and shoulder ache people blame on their eyes.
This is the single most common buying mistake in this category, and it is worth five minutes before you spend anything. We wrote the whole thing up in computer glasses vs reading glasses. The short version: if you do not already need help reading small print, you do not want magnification.
Every frame we sell has a plain non magnified lens. That is the entire computer glasses range. No diopters, no strengths to choose.
The number that decides fit: frame width
This is where buying eyewear online goes wrong, and it has nothing to do with the lens. A pair that filters perfectly and pinches your temples will sit in a drawer.
Frame width is the total outside width of the frame, hinge to hinge, in millimetres. It is the number that decides whether a pair grips, sits right, or slides down.
How to find yours in thirty seconds. Take any pair of glasses or sunglasses you already own and like. Lay them flat and measure straight across the front, from the outer edge of one hinge to the outer edge of the other. That millimetre figure is your target. Match it within about 3 mm and a new pair will feel familiar.
If you own nothing to measure, the rough guide is that most adult frames land between 135 and 145 mm, narrower faces below that, wider faces above.
Our full range by frame width
We publish the frame width, bridge, lens size, temple length and weight on all 63 frames. Here is the whole catalogue sorted by the number that matters, so you can go straight to the band that fits you.
| Frame width | Frames | Who it usually suits | Examples |
|---|---|---|---|
| 124 to 129 mm | 11 | Children, and adults with narrow faces | Indland 124, Hillside 124, Hudson 127 |
| 130 to 134 mm | 7 | Smaller adult faces, older children | Clarity 132, Tech 132 |
| 135 to 139 mm | 14 | The common middle | Pacific 139, Atlantic 137, Monarch 135 |
| 140 to 144 mm | 24 | The most common adult size | Shadow 140, Study 142 |
| 145 to 151 mm | 7 | Wider faces | Station 145, Boreal 146, Drama 151 |
A useful comparison, since the Costco listing gives us real numbers to work with. That pair measures 138 mm across, with a 54 by 35 mm lens, an 18 mm bridge and a 142 mm temple, at about 18 grams. Our Atlantic is 137 mm across with a 54 by 34 mm lens and a 140 mm temple at 20 grams. If the Costco fit suits you, that is nearly the same frame geometry, without the magnification.
Weight matters more than people expect
Our lightest frame, the Shadow, is 10.2 grams. Our heaviest, the Sail, is 35 grams. That is three and a half times the weight, and across an eight hour day you notice it on the bridge of your nose. If you are at a desk all day, stay under about 20 grams. If you only wear a pair for an evening, it matters much less.
“Fake” blue light glasses, and how you would actually know
This comes up constantly with marketplace listings, so here is the honest version.
There is no certification body for blue light lenses in Canada. No official stamp exists for a seller to forge. So “fake” almost never means a counterfeit. It means a filtering claim that nobody has checked, including ours.
The usual home test is a small blue LED pen. Shine it through the lens and see if the light dims. The problem is in the wavelengths. Those pens tend to peak around 400 nanometres, which is violet. Your monitor puts out most of its blue nearer 450 to 460 nanometres. Clear lenses filter hardest at the low end and much more gently at the end your screen actually lives in. So a pen can dim beautifully and still tell you very little about your monitor.
That applies to our lenses too. We say our clear lenses filter 85 to 90 percent, and that figure describes the strongest part of the range, not every wavelength of blue light. We would rather say that plainly than let you discover it yourself.
We set out the tests that do and do not work, with what each one proves, in how to test blue light glasses at home. If you are weighing up a cheap marketplace pair, read that first. It will tell you more than any review score.
Do cheap ones work?
Price and filtering are not strongly connected. A clear blue light lens is not expensive to make, so a $20 pair and a $90 pair can filter similarly. What you pay more for is frame material, hinge quality, finish and whether anyone stands behind it.
Our range runs from $22.94 to $47.95 and nothing is over $48. We go into what drives the price across the whole category, including the expensive brands, in what blue light glasses cost in Canada.
Worth saying clearly: the evidence that blue light glasses relieve eye strain is weaker than most sellers imply. Screen eye strain is mostly about blinking less, focusing at one distance for hours and dry air. We cover what actually helps in digital eye strain, causes and prevention. Buy a pair because you want the filtering and the comfort, not because you expect it to cure a headache.
So which should you use?
- You need a prescription. Costco Optical, or your own optometrist. We cannot help you, and we would rather say so than sell you the wrong thing.
- You need it tomorrow. Amazon. Speed is a real advantage and we are not going to argue with it.
- You want to try it on first. Walmart or Costco in person.
- You want a plain non magnified lens, in a frame you can match to a measurement before you order. That is what we built. Every frame, every number, published.
Browse by who it is for: men’s frames, women’s frames, children’s frames, or the full range. Gamers should start with gaming glasses, because the clear lens decision matters more there than anywhere else.
Common questions
Are Amazon blue light glasses any good?
Some are and some are not, and the listing usually will not tell you which. Amazon is a marketplace, so quality and specs change from seller to seller rather than being set by Amazon. If you buy there, check whether the listing gives you a frame width, and treat any filtering percentage as an unverified claim.
Does Costco sell blue light glasses in Canada?
Yes. Ready made pairs with blue light filtering are sold through Costco Optical, listed as readers and sold in a two pack. Costco also puts blue light filtering into prescription lenses. A membership is required.
Does Walmart Canada sell blue light glasses?
Yes, mainly through outside brands such as Cyxus and Cloudfield. One Cyxus listing we checked was priced at $52.35, which is above the top of our own range.
How can I tell if blue light glasses are real?
There is no certification to check, so the honest answer is that you cannot verify a filtering percentage at home. A blue LED pen test tells you less than it appears to, because those pens emit violet light near 400 nanometres while your screen emits most of its blue nearer 450. Our home testing guide explains what each test genuinely proves.
What size blue light glasses should I order online?
Measure a pair you already own across the front, hinge to hinge, in millimetres. Match that figure within about 3 mm. We publish the frame width on all 63 of our frames, which range from 124 mm to 151 mm.
About this guide
BlueLightGlasses.ca is a Canadian store selling non prescription blue light glasses. We are not optometrists and nothing here is medical advice. If you have ongoing eye pain, headaches or vision changes, see an optometrist rather than buying glasses.
The measurements in this article come from our own supplier specifications for all 63 frames. The Costco and Walmart figures were taken from their live listings on the date this was published, and retailer pricing changes, so check before you buy. Where we were not able to verify something, such as what a typical Amazon seller publishes, we have said so rather than guessed.
