Frequently Asked Questions

Here you can find the answer to the most common questions regarding our Masked 40 hz Light.

General FAQ

What is 40 Hz light stimulation?

It is exposure to light pulsing at 40 hertz (40 times per second) designed to synchronise a particular type of electrical activity in the brain known as gamma waves.

High gamma activity is associated with good memory and learning. In situations where we are under great pressure and need to provide greater performance, gamma activity in the brain increases.

Recent studies suggests that gamma could even slow certain medical conditions, such as Alzheimer’s disease.

Visit our science page to learn more about it.

Why is there a black dot in the middle of the screen?

The black dot helps you focus the gaze on the light without causing eye fatigue.

What conditions does the Masked 40 Hz light help with?

Please be aware that our device is still experimental. The Masked 40 Hz light is not a medical device – it is not intended to diagnose, treat, cure, or prevent any disease or health condition.

We are currently conducting a clinical trial as well as several research studies with recognized institutions to investigate the efficacy of our solutions.

Is the Masked 40 Hz light dangerous?

Our electronic device is CE marked, meaning that we have verified compliance with the essential safety requirements as indicated in the applicable European Directives and Regulations. That being said, it must be mentioned that we are still investigating the safety of the intervention in our current clinical study ALZLIGHT Pilot.

Moreover, people who suffer from light sensitivity or are susceptible to epileptic seizures might negatively react to the stroboscopic effect of the light, albeit invisible. Therefore, wstrongly encourage anyone who might be at risk to first contact their doctor before using the light stimulation device.

Usage FAQ

How do I use my Masked 40 Hz Light?

OptoCeutics Masked 40 Hz light is quite simple to use.

➤ Sit down, turn on the light and look at it for 1 hour
(it can also be used for 15 minutes 4 times a day; or you can split the total usage time in as many sessions as you please)-

➤ The light is most effective when used for approximately 60 minutes a day
(preferably in the first half of the day – ie. 8 hours before going to bed).

Please refer to our user manual for more details.

Why do you recommend to use the light in the first half of the day?

Exposure to bright light at the wrong times alters the body’s internal clock and can make it harder to fall asleep.
That’s why, for example, we should avoid using our mobile phone or laptop before bedtime.

A good sleep-and-wake cycle is extremely important for many functions in our everyday life; therefore, we recommend that you use the light stimulation device in the first half of the day.

How do I make myself comfortable while using the device?

➤ Choose a comfortable chair to sit on.

➤ Place the device at an appropriate height, so you do not have to strain your neck to look at it.
Remember that you must sit at approx. 50-100 cm distance from the light .

➤ Make sure that the device is placed on a stable and secure surface.

How do I make the time go faster while using the light?

You could, for example, listen to an audiobook / podcast, listen to music, radio, or have a conversation with friends and family.

If you or your loved ones have any ideas or suggestions that we have not mentioned here, please feel free to contact us at for guidance.

Can I knit while looking at the light?

You may only knit if you can do so without looking at the knitting.

Can I talk on the phone while using the device?

You are welcome to talk on the phone while using the device.

However, if you are using our device as part of a research experiment, we recommend that you do not hold the phone up to your ear – use a headset or speaker instead.

Can I watch TV while receiving light stimulation?

You should preferably look directly at the device screen, which should ideally be the main source of light during the session.

Therefore, we recommend that you do not watch TV during the light stimulation.

What can I do if using the device makes me feel sleepy?

➤  If you have a hard time staying awake you can try some gentle physical exercises with your arms, hands, and feet (without moving your head). Here’s two examples:

(1) Flex and point your right foot 3 times; (2) repeat with the left foot; (3) then repeat with both feet together. This is one full repetition. Perform 5 repetitions in total.

(1) Slightly lift your left leg 3 times, so that your foot doesn’t touch the floor; (2) Repeat with the right leg. This is one full repetition. Perform 5 repetitions in total.

➤  After 2 minutes of such activities you should feel more alert. We suggest you to build a routine of different exercises and, if needed, ask your relative / helper to guide you through it.

➤  You can also ask your relative / helper to open a window so you can get some fresh air.

➤  Or you can ask your relative / helper to pick up something sweet for you to eat or drink.

Eye Tracking FAQs

Why does the device have an eye-tracking function?

It is important that you look directly at the light as long as possible. It is also important that you do not keep your eyes closed all the time. That’s why we have developed the “eye-tracking” function, so that it can measure how much time you actually look directly at the screen.

Although the device is already equipped with eye tracking technology, this feature is only used in clinical trials to date. In the next software updates, ordinary users will also have access to and benefit from such data.

How does "Eye-tracking" work?

Eye-tracking is used to measure how long you look directly at the light.

Through the small camera installed on the device, your face is photographed, and a small program assesses whether you are looking directly in the direction of the light. That information is saved, but the image is deleted immediately. This process is repeated throughout the whole light stimulation session.

This number is used by the researchers in the clinical studies, as it is assumed to be of great importance of how effectively the subjects look at the light. If you are not in a clinical trial, the data won’t be collected and the information will not be used for anything.

Eye-tracking does NOT collect personal information or images.

Does the device store pictures of me?

No, it instantly changes your image into a number to assess how long and from which angle you look into the light.

Didn’t find an answer?

Please, don’t hesitate to get in touch with us, we are very approachable!