Re-Timer Green Light Visor

£166.66(Exc 20% VAT)

£199.99(Inc VAT)

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Product Inclusions

The Retimer is designed to realign your body clock to optimise sleep, assist shift workers, help frequent flyers or help you fight the winter blues. We’ve included everything you need to get optimal use from your Retimer.

1 x Re-Timer light device

25 years of university research and 2 years of product development has resulted in the Retimer. Retimer was designed by sleep psychologists for use by the public. Retimer has the following features:

  • Fits over your reading glasses
  • Ergonomic and light weight design (just 75 grams or 2.64 ounces)
  • Folding arms for compact travelling
  • Soft glow for reading or computer work
  • Convenient rechargeable battery in the frame
  • USB connection for battery charging


1 x Premium embossed travel case

Protect your Retimer with this compact travel case. The case insert keeps your Retimer securely in place whilst the hard shell protects Retimer from the rigours of international travel. An essential accessory for frequent flyers, this case comes standard with each Retimer.

1 x USB recharging cable

Whilst the Retimer has 4 hours of battery life, we’ve included a USB recharging cable so you are never caught out. Simply plug this cord into your laptop. For those of you do not want to use your computer USB port to charge the unit, we also offer a USB recharger for the re-timer which enables you to charge it from your mains electricity supply. CLICK HERE for more information.

Product reviews

Aug 02, 2013 by Nancy

I noticed a difference after just a couple of days. feel more awake during the day and am finally able to get to sleep at a normal bedtime!

Jun 19, 2013 by Ben

Slept properly on night one after getting into LA from Sydney. Never happened before. Cheers!!

May 23, 2013 by Stacey

I work odd hours and feel really sleepy in the mornings. I use my retimers to perk myself up so I can function properly. So far it's worked well for me.

Re-Timer Research


Re-Timer uses a peak of 500nm which is in the blue-green spectrum. Professor Leon Lack is the sleep psychologist from Flinders University whom invented Re-Timer. There are a few reasons he chose green light:

1.      In one of our university trials we found that blue-green light of 497nm to be more effective than blue light (470nm) in phase delaying the circadian rhythm (attached),

2.      The lens in our eyes becomes cloudy as we age. This clouding effect allows less blue light into the eye. This may mean that devices relying on blue wavelengths, particularly those in the range of 430nm – 470nm, are sub-optimal in re-timing the circadian clock given that the blue and green wavelengths are needed to suppress melatonin production. A recent study from the Netherlands appears to support the hypothesis that green would be a more effective wavelength in the older population.

30 minutes each morning for 4 mornings in a row will advance the circadian clock of the user (wake up earlier). This will also be accompanied by an earlier bed time. So early morning use assists users feel sleepy in the evening and go to bed earlier.


In research to be published shortly, we have found that over 78% of trial participants realised both an advance of their circadian clock to an earlier time (fall asleep earlier and wake up earlier) whilst also realising an extension of their total sleep duration by almost an hour.


Background to invention

Professor Leon Lack and Dr. Helen Wright are the inventors of Re-timer. Since 1987 they have studied the use of light to treat sleeplessness in the Sleep Research Laboratory at Flinders University.

A summary of select research is provided below.


Research summary: studies with Re-Timer prototypes

Wright HR, Lack LC, Partridge KJ. Light emitting diodes can be used to phase delay the melatonin rhythm. J. Pineal Res. 2001; 31:350–355 

Objective: The aim of this study was to compare the effect of a portable light source with that of a conventional light box in suppressing nocturnal salivary melatonin and phase shifting dim light melatonin onset (DLMO), a phase marker of the circadian system [Lewy and Sack, 1989].

Method: Two portable light sources, comprising light emitting diodes (LEDs) of two different wavelengths, were compared to a standard light box in suppressing and phase shifting nocturnal salivary melatonin. All light sources were equated for illuminance of 2000 lux. Sixty-six volunteers participated in the 2-day study and were randomly allocated to one of four conditions; light box, white LED, blue/green LED, or no light control group. Light was administered to the experimental groups from midnight to 02.00 hr on the first night.

Half-hourly saliva samples were collected from 19.00 to 02.00 hr on night 1 and until 01.00 hr on night 2. Percent melatonin suppression on night 1 and dim light melatonin onset (DLMO) for each night were calculated.

Conclusion: The experimental groups showed significant melatonin suppression during light stimulation, with the blue/green LEDs producing the greatest (70%) suppression. There was no significant difference between the light box at 63% and white LED at 50% suppression. Similarly, the blue/green LED had a significantly greater DLMO delay of 42 min and no difference between the light box of 23 min and the white LED of 22 min. These data suggest the portable LED light source is an effective way of delivering light to phase shift the melatonin rhythm, with the blue/green LED being the more effective of the two LEDs.


Helen R. Wright, Leon C. Lack and David J. Kennaway, 2004: Differential effects of light wavelength in phase advancing the melatonin rhythm. Journal of Pineal Research, J. Pineal Res. 2004; 36:140–144

Objective: Shorter wavelength light has been shown to be more effective than longer wavelengths in suppressing nocturnal melatonin and phase delaying the melatonin rhythm. In the present study, different wavelengths of light were evaluated for their capacity to phase advance the saliva melatonin rhythm.

Method: Light was administered via a portable light source comprising two light-emitting diodes per eye, with the irradiance of each diode set at 65 lW/cm2. Forty-two volunteers participated in up to six conditions resulting in 15 per condition. For the active light conditions, a 2-hr light pulse was administered from 06:00 hr on two consecutive mornings. Half-hourly saliva samples were collected on the evening prior to the first light pulse and the evening following the second light pulse.

Conclusion: The shorter wavelengths of 470, 495 and 525 nm showed the greatest melatonin onset advances ranging from approximately 40–65 min while the longer wavelengths produced no significant phase advance. These results strengthen earlier findings that the human circadian system is more sensitive to the short wavelengths of light than the longer wavelengths.


Leon LACK, Toby BRAMWELL, Helen WRIGHT and Kristyn KEMP. Morning blue light can advance the melatonin rhythm in mild delayed sleep phase syndrome. Sleep and Biological Rhythms 2007; 5: 78–80 

Objective: We investigated the effectiveness of morning blue light in advancing the sleep and melatonin rhythm of individuals with mild delayed sleep phase syndrome.

Method: The participants (n = 18) were randomly allocated to a light or control group. Wake-up times were gradually advanced to 06:00 hours over a week, during which the light group also received two hours of blue light immediately after waking. During the treatment week that followed, the blue light group was exposed to two hours of blue light each morning, starting immediately after waking up. The portable light source comprised blue light LEDs (470 nm peak wavelength with irradiance of 65 μW/ cm2) attached to the lower rims of spectacle frames.

Conclusion: The blue light group showed a significant 2.53-h advance of dim light melatonin onset, compared to no change in the control group. However, neither group had a significant advance of sleep times following treatment. Effective delayed sleep phase syndrome treatment may require adjunct behavioral instructions.


Wright HR, Lack LC. Effect of light wavelength on suppression and phase delay of the melatonin rhythm. Chronobiology Int. 2001 Sep; 18(5):801-8. 

Objective: Different wavelengths of light were compared for melatonin suppression and phase shifting of the salivary melatonin rhythm. The wavelengths compared were 660 nm (red), 595 nm (amber), 525 nm (green), 497 nm (blue/green), and 470 nm (blue).

Method: They were administered with light-emitting diodes equated for irradiance of 130 muW/cm2. Fifteen volunteers participated in all five wavelength conditions and a no light control condition, with each condition conducted over two consecutive evenings. Half-hourly saliva sam ples were collected from 19:00 to 02:00 on night 1 and until 01:00 on night 2. Light was administered for the experimental conditions on the first night only from midnight to 02:00.

Conclusion: Percentage melatonin suppression on night 1 and dim light melatonin onset (DLMO) for each night were calculated. The shorter wavelengths of 470, 497, and 525 nm showed the greatest melatonin suppression, 65% to 81%. The shorter wavelengths also showed the greatest DLMO delay on night 2, ranging from 27 to 36 min. The results were consistent with the involvement of a scotopic mechanism in the regulation of circadian phase.

How it works

How will Re-Timer help me sleep?

Your sleep-wake rhythm is naturally timed by sunlight. But working indoors and long winter months block much of the sun’s light from reaching you. As a result your sleep-wake rhythm can become disturbed making it difficult to fall asleep and leaving you tired the next day.

Your eyes contain cells which detect bright light; your body responds by signalling your brain to be awake and alert. This process also helps your body to understand when it’s time to sleep. Re-Timer sleep glasses help you maintain a consistent sleep-wake rhythm to maximise sleep quality.

How long will it take for Re-Timer to work?

Wearing Re-Timer sleep glasses for 30-50 minutes a day gives your body the bright light you need to maintain a healthy sleep-wake rhythm. Using Re-Timer in the morning shortly after waking will help you fall asleep earlier. Typically, you will notice a change in your sleep-wake rhythm within 4 days.

What scientific evidence exists?

See the Research Section of this Product. 

Will Re-Timer benefit me if I live in a sunny location?

Yes, there are 3 reasons:

  • Re-Timer provides bright light at the right time for your body. Re-Timer replicates the natural response your body receives from the sun. To adjust your sleep pattern to an earlier time, you must receive bright light stimulation in the early morning. Research indicates the optimal time of use is shortly after waking up. It is not feasible to receive bright sun light this early in the day.
  • Green light is the optimal light source. The sun contains a broad spectrum of wavelengths (colours). It is the green wavelength which is the most effective at creating the physiological processes that manage your sleep-wake rhythms.
  • Re-Timer is 100% free of UV Rays.

 Can Re-Timer help with issues other than sleep?

Our research at Flinders University is predominantly on improving sleep. However, our testimonials indicate Re-Timer is also useful to:

  • Reduce jet lag by retiming your sleep-wake rhythm in small steps before you travel
  • Increase energy during the long winter months
  • Manage fatigue if you are a shift worker

Watch here to see the Re-Timer on the recent ALan Titchmarsh Show:



Can I read or work whilst I use my Retimer?

Yes. The Retimer is designed to fit over your reading glasses. The light source is soft so that you are not inhibited from reading or working.

Will the Retimer fit me?

The Retimer is designed to fit 95% of the population. If you have an average or slightly large or small head, the Retimer will fit. The device is also made from a material which flexes and contours to your head. This ensures it is stable and comfortable

How long does it take for the Retimer to start working?

Results vary from person to person. Generally, you will notice a shift in your body clock within 3 days of use. A similar timeframe is required to realize a benefit for the winter blues.

How long does the battery last for?

Approximately 4 hours (if the battery has been fully charged). This will fluctuate depending on status of battery charge and temperature.

Am I allowed to take the lithium rechargeable battery on a plane?

Yes. The battery used complies with international requirements for passenger hand luggage or stowed luggage containing a lithium battery. If you are carrying multiple Retimer’s with you, please check with airline to ensure this meets their rules. The battery cannot be removed from the product.

Does the RE-TIMER come with a carry case?

Yes. Each Retimer comes with a premium case for transportation.

Can I re-charge my RE-TIMER if I do not have a USB port for charging?

The Retimer comes with a USB cable for recharging. If you would like to re-charge your device from a wall outlet, you will need to obtain a wall adapter from your local retailer. Ensure you obtain a wall adapter which is compatible with the USB cable.

Can I use the device more than once a day?

For most people, it is sufficient to use the Retimer once a day. We recommend you only use the device for 50 minutes or less each 24 hour period.

Is RE-TIMER safe for children?

The Retimer is not suitable for children younger than 13 years old as the crystalline lens has not yet matured. Their eyes do not yet filter light in the same way that it does for adults. The result is a sensitivity to light that is too great.

I am on a light sensitive (photosensitizing) medication, is it okay for me to use the light?

Although the Retimer does not produce the wavelengths that photosensitizing medications react to, we recommend that you avoid using any light therapy, and avoid direct sunlight until you are no longer using photosensitizing medication.

I suffer from an eye condition, can I use the Retimer?

If you suffer from a medical condition you should consult your doctor before using this product. The Retimer is not a medical device. We recommended you do not use the Retimer if you have or have had any of the following: Any eye disease such as, but not limited to, cataracts, glaucoma, retinal disorders (e.g. macular degeneration) or have undergone eye surgery. Consult an ophthalmologist before use if you have any concerns

Is the light source safe for the eyes of an adult?

Yes. The Retimer has undergone independent ocular safety testing.

Looking for a spare instruction manual? Here is a digital copy

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