Key Takeaways
If you're wide awake at 1 am and without energy by 7, the problem usually isn't willpower or your mattress. It's light.
Your body clock needs a strong dose of it early in the day to keep proper time, and most of us go weeks without getting one.
Re-Timer has been selling a wearable fix for that since 2012 and this review will help you understand whether it works — and whether it's the pair you should buy.
Re-Timer 3 at a Glance

| Best for | Night owls, winter blues, jet lag, shift work, and glasses wearers looking for a frame-friendly option |
| Stand-out feature | 500nm green-blue light that passes through blue-blocking lenses untouched |
| Price | ~$220 (Re-Timer 3, direct) |
| Pros | Deep research history; light at 36g; usable with many glasses, though fit varies by frame |
| Cons | LEDs sit in your line of sight; the look; no evening mode; 30-day returns |
| Light | Green-blue, 500–504nm, UV-free |
| Brightness | Two levels — roughly 315 and 506 lux at the eye |
| Session | 30–45 minutes a day, with 20/30/60-minute timers |
| Battery | Up to 5.6 hours per charge, USB-C |
| Guarantee | 30-day money back; 1-year warranty |
Who Are the Re-Timer Glasses Best For?
No device suits everyone, and saying otherwise just wastes your money. But there's a clear group that tends to get real value here.
You're a good fit if you're:
- Someone who wears glasses, with a caveat. Independent reviews show Re-Timer works well with some frames and poorly with others: smaller or thicker-rimmed frames can cast a shadow over the pupil, cutting into how much light actually reaches the eye.
- Depending on your frame's shape and size, an alternative on the market may fit better. Where Re-Timer does have a genuine edge is with blue-light-filter reading glasses — because its 500nm light sits outside the blue range, it isn't blocked much by a blue-light coating, assuming the fit underneath works for you.
- A night owl. Late sleep timing is exactly what Professor Leon Lack spent decades on at Flinders University, and it's what this device was built around.
- A shift worker. Rotating shifts wreck your clock, and a light you can wear can significantly help your circadian rhythm.
What You're Actually Paying For

Green-blue light at 500nm
Most of the field sits at 460–470nm blue, because that's near the peak of melanopsin — the pigment your eye uses to tell the brain it's daytime. Re-Timer sits just to the right of that peak.
The research on which wavelength wins isn't settled: one study found roughly 497nm produced the larger phase delay (useful for evening-type adjustments). In contrast, another found 470nm blue pulled ahead for phase advance (useful for morning-type adjustments).
The broader clinical consensus still leans toward narrow-band blue as the most reliably potent stimulus for melanopsin, and which wavelength performs better likely depends on what you're trying to achieve.
And, as noted, green-blue light holds up better against blue-blocking lens coatings than blue light does. Lab testing has put Re-Timer's melanopic EDI between 539 and 1098, depending on setting and fit.
The v2 versus Re-Timer 3
The first Re-Timer (2012, later tweaked into what people call v2) weighed 75 grams, charged over a mini-USB cable, and looked like a prop from a mid-budget sci-fi film. The Re-Timer 3, which landed after a 2024 crowdfunding round, weighs 36 grams, charges via USB-C, ships with three nose-piece sizes, and includes an app.
The app
Re-Timer 3's app logs your sleep, syncs with Apple Health and Android Health Connect, and shows you how steady you've been. It goes beyond simple tracking, too: it includes tools for planning phase-advance and phase-delay timing, walking you through adjusting to a new time zone ahead of travel, and guidance for shift workers managing rotating schedules.
UV-free, and hands-free
You can make toast, clear email, or lose an argument with a toddler while wearing them. That's the real edge over a lightbox, and it holds up.
Re-Timer Pricing
| Item | Price | What's included |
| Re-Timer 3 | ~$220 | Glasses, travel case, soft pouch, USB-C cable, three nose pieces, 1-year warranty |
| Re-Timer (v2) | Often discounted | The older 75g model — check the listing first |
The device is usually FSA/HSA-eligible in the US, comes with a 30-day money-back guarantee, and carries a 1-year warranty against defects.
What the Research Actually Says
The device was developed at Flinders University in Adelaide, invented by Professor Leon Lack and Dr Helen Wright. Lack has published on light and sleep timing since the late eighties, with peer-reviewed work in 2001, 2003, 2004 and 2007 showing that short-wave light shifts melatonin better than longer wavelengths. The company was formed in 2011. The product launched in November 2012. It now ships to more than 40 countries.
Re-Timer Positives
- A real research history. More than a decade on sale, university roots, and a stack of outside studies. A solid option for some glasses wearers. The 500nm light is less affected by blue-light-blocking lens coatings than a blue-light rival — though fit still depends on your specific frame, and not every pair of glasses works well with it.
- Great option for glasses wearers. The 500nm light passes through blue-blocking coatings that would blunt a blue-light rival.
- Actually light now. At 36 grams, the Re-Timer 3 finally killed the weight complaint that dogged the old model.
- USB-C at last. A small thing that stopped being small around 2019
- Dead simple to run. One button, three states. Nothing to set up, nothing to break.
Re-Timer Negatives
A few things to weigh:
- The LEDs are in your way. This is the big one, and the redesign didn't solve it. The four lights sit low, so they're right there when you read, type, or check your phone. Some people adapt within a week. Others report dark spots in their vision for a while after a bright session.
- You will get looked at. The frames were shaped so your eyebrows don't block the light so some people may not like the design.
- Only two brightness levels. No 10–100% dial, no custom session length beyond the timers.
- A tighter returns window. Thirty days, against sixty from several rivals.
- Marketplace muddle. Old v2 stock still floats around, and it isn't always labelled clearly.
The Verdict: Are the Re-Timer Glasses Worth It?
For the right person, yes.
If you wear prescription glasses with a blue-light filter, the Re-Timer is worth a look — it's less affected by that kind of coating than a blue-light rival, though how well it fits still depends on your specific frame. Add the research history and the simple controls, and at around $220, you've got a solid device that does what it says it will.
Who should think twice? Anyone bothered by glare, because the LED placement is a design choice you either adapt to or you don't, and anyone who wants to wear them through a long morning at a screen.
The Best Alternative: Why the AYO+ Fixes Re-Timer's Weak Spots

Every fair gripe above is a design problem, not a physics problem. The AYO+ was built around those exact gripes. Here's how they line up.
| Re-Timer 3 | AYO+ | |
| Weight | 36g | 32g, weighted at the back, so little rests on your nose |
| Light | Green-blue 500nm, four bright LEDs low in view | Narrow-band turquoise 463nm, softened and low-glare |
| Brightness | Two fixed levels | 10–100%, your call |
| Session length | Preset timers | 5–90 minutes, your call |
| Guidance | Jet lag & shift-work planning tools, sleep logging | A rhythm test, plus timing for light, sleep, meals and caffeine |
| Evening mode | None | Red-light wind-down (630–655nm) |
| Guarantee | 30 days | 60 days |
| Price | ~$220 | $299 |
The gap that matters isn't the four grams. It's the kind of guidance: AYO' app maps your personal rhythm through a built-in test and then tells you when to take your light, rather than working from general scenarios. Re-Timer's app is genuinely useful for situations like jet lag or shift work — it's just not built around a personalized baseline the way AYO's is.
If your glasses have a blue-blocking coating, AYO's 463nm light is more affected by it than Re-Timer's 500nm. In practice, this is easy to work around with AYO — you simply wear the glasses between your face and your reading glasses, so light reaches your eyes directly rather than passing through the coated lens.
It's worth knowing about, but it doesn't give Re-Timer a real edge for most glasses wearers.
How to Choose Light Therapy Glasses

Not sure how to weigh one against another? Only a few things move the needle.
- Wavelength and clock effect, not lux. Brightness on its own is a misleading number. What you want is light that your eye's clock cells respond to, strong enough to clear the bar without hurting to look at. Re-Timer gets there through green visibility. Narrow-band designs get there through aim. Both work. The question is which one feels bearable at 6:45 am.
- Comfort and glare. A device you dread wearing won't get worn, and an unworn device works exactly 0% of the time. Weight matters, but where the lights sit matters more.
- Guidance. If you already know your ideal window, a simple device is fine, and you'll save money. If you don't — and most people don't — an app that maps your rhythm is worth the extra cost.
- The returns window. Give yourself long enough to find out.
The Light Is Only Half the Answer
Re-Timer gets the physics right, and a bunch of research backs that up. Where it comes up short is everything around the light: the glare, the look, no evening wind-down. If you want to see how a wearable can close those gaps, take a look at the AYO+ →.