How does blue light affect your health?

Introduction:

As a dietitian – phytotherapist and natural medicine specialist – and winner of the Eagles of Medicine 2025 competition – I see every day how seemingly small environmental factors affect health. One of the most ignored is the blue light that accompanies us throughout the day — from screens, LED lighting and mobile devices, car lights after dark.

After personal experience of photophobia after a head injury, I reached for NoBlue solutions: glasses, light bulbs and lamps without blue light. The effect was stunning. I could enter the living room and kitchen, where the light was on; I could go to the market for shopping; I could go out for a walk after dark; I was able to drive a car and return to many other daily activities.

You’re probably thinking, oh I don’t have such an injury, so I don’t need such glasses… And here you are wrong. Reducing blue light means deeper sleep, better recovery, less fatigue, fewer migraines, and a visible improvement in concentration. Today I know that this is not a fashion — it is science, prevention and therapy in one.

In this article, you will find out for whom, how to use it and what benefits you will get when using NoBlue products. I will present you with scientific research, but also my own observations and practice. I will combine EBM (Evidence Based Medicine) and PBM (Practice Based Medicine) here.

What is blue light and why does it disrupt your biological rhythm

Blue light is a spectral range with a wavelength of 380–500 nm. It tells your brain: “it’s daytime, be active”.
The problem arises when its exposure lasts late — from computers, phones, LEDs, car lights. Then the body cannot properly produce melatonin – the hormone of sleep and regeneration. The so-called blue light reduction or night mode on devices will not help you either, because it only adds red light without blue reduction!

Studies show that:

As little as 6.5 hours of exposure to blue light (compared to green) doubles the decrease in melatonin and delays sleep by 3 hours. (Harvard Medical School)
Even short sessions in the evening cause melatonin suppression depending on the dose and light intensity. (PubMed ID: 21164152)
Reducing the blue component in light improves circadian rhythm, sleep and energy levels, increases the number of delta waves (deep sleep), which has a positive effect on brain regeneration (ScienceDirect, 2021)

Conclusion: Your body can’t tell the difference between monitor light and sun — and the NoBlue filter “turns off the day” at the right time.

Conclusion: It is already clear who should take special care of the reduction of blue light: office workers, children and young people, people with chronic fatigue, people working night shifts, drivers, people working in closed rooms without access to daylight – people in warehouses, halls, conference and trade fair centers, television studios. I hope I didn’t leave anyone out.

How Blue Light Affects Melatonin, Sleep, and Hormones

Melatonin is a hormone that informs the body that it’s time to sleep. Its deficiency leads to disorders of regeneration, immunity and hormonal balance, insomnia.

Studies show:

Blue light reduces the amount of delta waves (deep sleep waves) and shortens REM phases. (ScienceDirect, 2021)
Retinal cells containing melanopsin transmit signals to the supra-sacral nucleus (SCN), the brain’s “biological clock.” The activation of these cells by blue light delays the sleep cycle and the secretion of melatonin. (Chronobiology in Medicine, 2023)

For you, this means a simple equation:
Less blue light = More melatonin = Better sleep, recovery, mood and concentration.

NoBlue products – glasses and bulbs that filter the blue band – help your body get back into its natural rhythm. In the evening, they calm the nervous system, in the morning they do not disturb alertness.

Conclusion: Another group consists of people suffering from insomnia, experiencing “dry eye syndrome”, suffering from retinal dystrophy, people under chronic stress.

Retinal and eye protection – scientific evidence

Blue light is also a factor of oxidative stress for the retina, especially in people with high screen exposure, photophobia or after injuries.

Scientific reviews show:

Short-wave light (400–450 nm) damages retinal pigment epithelium (RPE) cells, which accelerates degenerative processes. (PubMed, 2024)
The use of a filter that blocks 94% of the blue spectrum protects the structure of the photoreceptors and the function of the macula. (PLOS ONE, 2018)
RPE cells exposed to blue light exhibit increased oxidative stress and apoptosis. (PMC11685196, 2024)

Why is it important?

Children and adolescents have clearer lenses than adults, which is why their retina absorbs more blue light. Prolonged exposure can increase the risk of micro-damage and visual sensitivity.

Using NoBlue glasses with a blue light filter is an investment in eye protection – today and for the future.

Conclusion: At the moment, there are no studies that unequivocally say that blue light causes macular degeneration, but observations unequivocally say that reducing blue light reduces symptoms.

Conclusion: If you suffer from retinal diseases, corneal diseases, eye inflammation, you have undergone eye surgery, it is beneficial for you to limit blue light. Consider NoBlue filters and glasses.

Blue light and the nervous system – a special role in ADHD, migraines and TBI, photosensitive epilepsy

Studies from recent years point out that the reduction of blue light has therapeutic significance in people with sensory hypersensitivity, ADHD and after brain injuries (TBI – post-traumatic brain damage).

Examples:

A 2020 study showed that blue light filtration reduced the severity of hyperactivity symptoms and concentration problems in children with ADHD.
In concussion patients, the use of Blue-Blocker filters reduced photophobia and headaches by up to 60%.
In migraines, blue light activates retinal ganglion cells that transmit stimuli to the thalamus — blocking this band reduces the frequency of seizures. (Nature, 2019)

Practical benefits:
NoBlue products support not only the eyes, but also the nervous system. Less exposure = less tension, migraines and sensory fatigue.

Light for health – how to use NoBLUE in practice NoBlue glasses

Put on 1-2 hours before bed or at work in the evening. They reduce arousal and support melatonin production.

Based on my personal experience, I can see that blue light stimulates the sympathetic system, maybe even increases the amount of cortisol, causes tension and nervousness, increases alertness. Such stimulation is unfavorable for neurological regeneration, ADHD or migraines.

I have been wearing NoBlue glasses since dark, I have been using them for 3 years. I can say that they are very effective, neatly made, have a nice protective box. I also bought them for my children. I take them with me everywhere – to work, to the car, to the store, even on vacation, and I encourage you to take care of your eyes and regeneration, and above all your nervous system. My accountant and many of my patients also wear them, join us 🙂

NoBLUE bulbs and lamps

Use in the bedroom, living room, or study in the evening. They emit a warm, friendly light (1200 – 1700 K) with a limited blue band. I have such bulbs in the 3in1 bathroom (bright morning light, orange – medium light and red light for late evening); in the kitchen and in the children’s rooms. I also use NOBLUE night lights, because in addition to having 3 types of light, they also adjust its intensity. I think this can be a great gift for you or someone close to you.

The most unfavorable for the nervous system is a strong and rapid change of lighting, so imagine – you get up at night to go to the toilet, or the child woke up and a light bulb loots in the eyes. And I have a warm, soft red light 🙂

Daylight in the morning

In the morning, use natural light – it strengthens the circadian rhythm and improves well-being. The combination of bright light in the morning and blue reduction in the evening is the most effective natural regulation of the biological rhythm.

When blue light filtration is particularly advisable

People with head injuries (TBI, concussion) –> Light reduction reduces photophobia and central hyperactivity, allowing you to return to normal functioning.
Children and adolescents –> Protection of the developing retina and endocrine system.
People with migraines or epilepsy –> Reducing light stimuli reduces the frequency of seizures and headaches.
Office workers, gamers, screen users –> Reduce eye strain and eye stress.
Warehouse workers, night shift workers –> Eye and nervous system protection, reduces arousal, relieves stress.
Media and TV workers –> Reduce eye strain and eye stress, protect the retina.
People with retinal diseases –> Eye protection.
Drivers, driving at night –> Eye protection, eye strain.
People with ADHD –> Improved sleep quality, better recovery and calmness, less agitation.
People with insomnia, seasonal depression –> Support natural sleep rhythm and mood.

Light and holistic health – the NoBlue approach

In natural medicine, we say that light is biological information.
Bad information (excess blue spectrum after dark) disrupts hormones, sleep rhythm and regeneration.
Good information (balanced and warm light) supports self-repair processes. NoBlue products are designed to:

protect your eyes from phototoxicity,
support the nervous and endocrine systems,
improve comfort and quality of life without having to give up technology.

But that doesn’t mean that now you can watch Dr. House with impunity until the morning of the 🙂 All with moderation and a golden mean.

Summary

Blue light is essential during the day but harmful at night.
Limiting its exposure improves the natural rhythm of sleep and hormones, gives better regeneration, has a positive effect on calming the nervous system, protects the retina and eyesight, reduces the symptoms of dry eye syndrome.
Protecting your eyes and nervous system is not a luxury, but a necessity in the world of LEDs and screens.

NoBlue glasses, bulbs and lamps help to regain biological balance – they protect the eyes, calm the nervous system and support regeneration after a long day.

I will add from myself – I consider it necessary to reduce blue light among young people, who often spend evenings with their phones in bed, until late at night. Parents come to the visit for help and say, HE/SHE is constantly tired, does not want to do anything, has trouble concentrating and cannot sleep. Hmm? I wonder why?
All it takes is really 2 weeks of NoBlue protection and going to bed at human time (parental control) and the problem is out of your mind. And if not, you can always deepen the diagnostics.

About the author:

Hanna S. Miller – certified dietitian, phytotherapist and bioresonance therapist (occupation code 322001), since 2011 professionally associated with natural medicine. Owner of BIOPORADNIA. She specializes in diet therapy, orthomolecular and functional medicine, combining these approaches in her work with patients. In the functional health clinic run by her, nearly one thousand five hundred patient cards have already been created, who have regained health and balance thanks to personalized therapy and diagnostics.

She has participated in numerous international scientific conferences and trainings in the field of neurology, gastroenterology, lipidology, immunology and mitochondrial medicine.

In her practice, she combines bioresonance, phytotherapy and functional dietetics, emphasizing an individual approach, holistic diagnostics and balance between body and emotions. Honored with the Eagles of Medicine 2025 award, known for her empathetic approach and effective, multidimensional therapies.

How Blue Light Affects Your Health – Why Choose NoBlue Glasses, Bulbs and Lamps