A new generation of calibrated lenses for sensory modulation in people with electro-hypersensitivity (EHS) and central sensitivity syndromes: an integrative approach based on light, spectrum and regulation
Introduction:
From a functional and neurophysiological perspective, light is much more than just a visible phenomenon: it is a set of electromagnetic frequencies, where each color of the spectrum represents a specific range of frequencies with unique properties. The nervous system, in its complexity, requires the sum and interaction of all these frequencies to optimize its adaptive capacity and maintain homeostasis. Thus, each shade from violets to reds constitutes an essential sensory nutrient that must arrive in appropriate proportions.
Not only the eyes, which act as the main access to the brain, but also the skin, are actively involved as light receptors. While the skin captures light information for peripheral processes, the eyes channel most of the light stimuli directly into the higher nerve centers, decisively impacting hormonal regulation and circadian synchronization.
When there is a desynchronization in the arrival of these frequencies, either due to excessive exposure, inadequate filtering or lack of certain spectral components, the adaptive capacity of the nervous system is reduced. This alteration affects self-regulation, resilience to environmental changes and the balance of hormonal axes, increasing the probability of symptoms typical of central sensitivity syndromes and electrohypersensitivity. Therefore, the intelligent modulation of the perceived light spectrum is essential to preserve integral well-being in environments overloaded with electromagnetic stimuli.
Based on field experience and observation of clinical casuistry in populations with electromagnetic hypersensitivity, including central sensitivity syndromes (CSS), selective filtering of the blue spectrum versus its total elimination is emerging as a central element for the restoration of sensory resilience.
J. Joaquín Machado · February 2026
BACKGROUND
Electrohypersensitivity (EHS), also known as electromagnetic sensitivity, is a syndrome in which an individual experiences physical discomfort as a result of exposure to wireless technologies, electrical devices, telecommunications towers, Wi-Fi, mobile phones, and artificial electromagnetic fields in general. The symptoms are diverse: chronic fatigue, headaches, insomnia, tachycardia, concentration problems, feeling of cranial pressure, dizziness and of particular relevance for this document extreme sensitivity to artificial light, especially that which contains high levels of emission in the blue spectrum (cold LEDs, screens, fluorescent lighting).6,16,17
People with EHS, can have great problems adapting to changing environments, and nerve dysregulation can modify the cardiorespiratory coherence of the individual and reduce the Swedish focus on social functionality and in work environments, as well as social can mean a greater propensity to episodes of body decompensation and effects of cumulative micro traumas. The key here is how to promote better conditions of self-regulation and adaptive resilience to sudden environmental changes in sound, light and electromagnetics.
Although the WHO does not formally recognize it as a disease, countries such as France, Spain and Sweden already consider it a functional disability. Cases of EHS have increased exponentially in recent years, and recent research proposes the term "environmental associated symptoms" to describe these conditions more accurately and neutrally.16 This syndrome is part of the CSS (Central Sensitivity Syndrome) which involves a nervous system with low adaptive capacity and a constant state of hypervigilance. In the author's experience, working directly with more than 37 case studies and collaborating in the follow-up of more than 1,000 additional cases, these people have shown that proper management of electromagnetic pollution, including care for the light environment, healthy habits of use of technologies, conscious distancing from major appliances, Healthy lifestyle in diet and habits (exposure to sunlight, regular grounding practice and correct hydration), as well as the management of healthy lifestyles in artificial blue light.17.18
EXECUTIVE SUMMARY
When protection becomes fragile
The consensus on blue light and its nuances in sensitive populations
In recent years, the widespread idea that blocking blue light as much as possible is positive for visual health, sleep quality, and overall well-being has taken hold. This premise has led to the popularization of the use of lenses with orange and red filters that eliminate practically the entire spectrum between 400 and 500 nm.
The use of this type of filter has provided significant benefits in circadian regulation for a growing number of users. However, it is important to note that there is a group of people who, after an average period of use of these lenses, have experienced only a partial and variable improvement. This group is made up especially of individuals with electrohypersensitivity (EHS), chronic photophobia, central sensitivity syndrome and neurodivergent disorders.
In early studies and clinical experiences, any manifestation of adverse effects associated with the use of extreme blue light filters was attributed to purely psychological factors of some users. However, the author's accumulated experience, both in the clinical field and in fieldwork with people with electrohypersensitivity (EHS), provided clear evidence of a worrying phenomenon: the higher the level of blue light blockage, the more pronounced the decompensation of the nervous system is when the filter is removed or there is a sudden change in the light environment.
This pattern reveals that the nervous system, far from developing resilience, experiences progressive fragility. Thus, episodes of nervous dysregulation not only increase in intensity, but also last over time. Therefore, extreme protection by completely blocking blue light can lead to greater vulnerability to environmental variations, generating a lower adaptive capacity and, consequently, a negative impact on the quality of life of the people affected.
|
Central thesis: Instead of completely extinguishing blue light, this paper proposes to selectively protect the most phototoxic range (400–455 nm) while preserving a functional fraction of circadian blue (≈455–500 nm) by 50/50 type lenses. The proposed strategy prioritizes the strengthening of adaptive resilience over the simple mitigation of acute exposure, focusing on populations with electrohypersensitivity (EHS), neurodivergent profiles, and individuals who, in contexts of chronic stress, present nervous systems in persistent states of hypervigilance and convergent patterns of nervous sensitivity. |
SECTION 01
The biology of blue: two spectra, two radically
different functions
The generic term "blue light" encompasses a range of about 100 nanometers (400–500 nm) that, biologically, contains opposite functions. Treating it as a homogeneous entity is a conceptual error with real clinical consequences.3,4,7
High-energy blue-violet (400–455 nm): Higher photonic energy per short wavelength. It is associated with retinal phototoxic potential. Matches the narrow emission peaks of cool white LEDs (≈450 nm). Physiological role: poor.7,3,8
Circadian functional blue (455–500 nm): Lengths close to 480 nm stimulate intrinsically photosensitive ganglion cells (iPRGC) and melanopsin with maximum efficiency. This pathway projects to the suprachiasmatic nucleus (SCN), modulating circadian rhythms, melatonin/cortisol secretion, autonomic tone, and emotional regulation. Physiological role: critical.4.3
A study published in Ophthalmic & Physiological Optics showed that reducing transmission by about 430 nm by as little as 50% can decrease approximately 80% of the risk of retinal photochemical damage, preserving a significant proportion of functional blue.7
|
The optimal goal is not to eliminate exposure to blue light, but to apply intense and specific filtering on the blue-violet spectrum considered phototoxic (400–455 nm). This strategy allows to significantly reduce the potential for retinal damage and nerve dysregulation associated with overexposure, especially in individuals with increased sensitivity such as those with electrohypersensitivity (EHS) or profiles with central sensitivity syndrome (CSS).
At the same time, it is critical to maintain the transmission of a functional fraction of circadian blue (approximately 455–500 nm). Thus, the selective approach guarantees the necessary protection against phototoxic risks, without sacrificing the critical physiological benefits provided by functional blue for internal homeostasis and the processes of self-regulation and body compensation in the face of light changes. |
Figure 1 — Typical emission spectrum of a cool white LED (6500K)
Note the narrow and intense peak at ≈450 nm compared to the more distributed phosphorus emission (green-red)
SECTION 02
The paradoxical effect of total blockage in people with hypersensitized nervous systems
In people without diagnosed hypersensitivities, a red or dark amber lens can work as an effective and clear nighttime circadian hygiene tool. However, it is relevant to note that the prolonged and routine use of these filters can progressively induce a loss of physiological adaptation to blue light frequencies.
This maladaptation can manifest itself as a gradual increase in light sensitivity, generating a potential risk of developing hypersensitivity to light, especially if it is not accompanied by adequate hygiene in exposure to natural light. Practices such as sky gazing, which promote the regular stimulation of blue-sensitive photoreceptors under controlled and natural conditions, are essential to preserve spectral tolerance and avoid maladaptive responses. It is important to emphasize that those who use these lenses may tend to neglect this type of exposure, remaining mostly in indoor environments where the inhibition of blue light is practically constant, which contributes to aggravating the process of adaptive loss.
Therefore, professional intervention must contemplate not only the selection of the optical filter, but also the active recommendation of healthy light exposure habits, integrating daily routines of eye contact with the sky at appropriate times and avoiding the complete suppression of the blue stimulus during the day. 9.1
2.1 The Loop of Hypervigilance and Sensory Avoidance
EHS and many forms of neurodivergence share a common neurological substrate: hyperreactivity of sensory circuits. This manifests as:5,6,4
— Amplified response to stimuli that do not cause discomfort in the general population (light, noise, electromagnetic fields, certain smells).
— Autonomic nervous system oscillating between chronic sympathicotony and parasympathetic collapses (extreme fatigue, disconnection).
— Reduced sensory tolerance thresholds, which are dynamically modified according to the context and the accumulated load.
When a filter is introduced that almost completely cancels out blue light (100% blocking between 400–500 nm), a biphasic phenomenon is triggered:2,1,9
Phase A — Acute relief (days/weeks 1–3)
The stimulus load on hyperreactive visual and circadian pathways is drastically reduced. The person experiences a perceptible "rest": less photophobia, a feeling of calm, a reduction in headaches. This relief positively reinforces the continuous use of the filter.
Phase B — Adaptive Detraining (3+ weeks)
By remaining many hours, a day without a blue signal, the visual and autonomic system stops training its tolerance to that spectral range. When the person takes off their glasses or transitions to an environment with cold LEDs, the difference in stimulus is perceived as a sensory shock, triggering dysregulation crises: dizziness, anxiety, tachycardia, extreme fatigue. In addition, it must be considered that human skin also responds to and regulates itself in the face of light, functioning as a biological "solar panel". However, this regulation depends on the signals that the brain receives through the light that reaches the eyes. If the eyes constantly block blue light, the brain's synchronization order to these light frequencies is not transmitted correctly to the skin, thus losing the proper physiological adaptation to ambient light.
|
Clinical analogy: This mechanism is structurally identical to total avoidance in post-traumatic stress disorders. Modern trauma therapy does not seek to eliminate the stimulus, but to graduate the exposure to rebuild tolerance, exactly what the 50/50 lenses propose. In addition, this phenomenon is also observed with the prolonged use of sunglasses that block ultraviolet light and significantly reduce ambient luminosity: by constantly filtering out key light signals, the brain receives altered information about the time of day and the actual intensity of the light present. This can lead to a lack of coordination between the skin and ambient light, as the skin depends on brain commands synchronized with the ocular's perception of light. As a result, alterations in the skin's circadian rhythms and damage associated with inadequate physiological adaptation to natural light can occur. |
2.2 Neuroplasticity as indirect evidence
Work on adaptation to ophthalmic lenses has shown that the visual system requires weeks to consolidate plastic changes. Chronically modifying the spectrum that reaches the eye is not a neutral act: it forces a neuronal reorganization that, in a hypersensitive system, can crystallize maladaptive patterns.10
Figure 2 — Transmission Profile Comparison: Full Block vs. 50/50 Filter
Spectral transmission curves (%) for a conventional red/amber lens and the proposed 50/50 design
SECTION 03
The logic of the 50/50 lens: modulating the signal, not anesthetizing the system
A lens designed to strongly block the 400–455 nm band but allow a significant fraction (≈40–60%) of the 455–500 nm blue to pass through, generates a qualitatively different clinical response profile than extreme blocking lenses.
3.1 Vendor Convergence
Multiple manufacturers have converged towards this same logic:11,8,1,3,12
— Blokz+ Tints (Zenni): ~92.7% blocking at 400–455 nm, not the full blue spectrum.
— BlockBlueLight "DayMax": blocks 100% of 400–455 nm but preserves blue of 455–500 nm.
— BPI Diamond Dye 460/510 dyes: pronounced absorption at 400–450 nm, recovery from 500 nm.
3.2 Partial blocking also works
A pediatric clinical trial13 evaluated partial-blocking glasses (~40% cut-off) before sleep: significant advance of bedtime, improvement in daytime behavior, and more pronounced effects in the second week, suggesting stable and progressive adaptation.
|
Clinical implication: Absolute lockout is not needed to obtain significant benefits. A well-calibrated partial filter can modify circadian physiology without imposing an extreme break with the actual light environment. In addition, it seeks to ensure that, especially after sunset, the dominant frequency of ambient light is around 600 nm or more, favoring warm lighting with color temperatures below 2000 kelvin.
|
SECTION 04
Field casuistry: differential responses
|
Clinical dimension |
Red/amber lens (full block) |
50/50 lens (selective filtering) |
|
Acute relief |
HIGH — Intense, immediate relief |
MODERATE — Noticeable, less dramatic |
|
Transition tolerance |
LOW — Crisis when changing the environment |
HIGH — Smooth Transitions |
|
Filter dependency |
CRECIENTE — "Without them I can't function" |
LOW — Non-Dependency Tool |
|
Long-term resilience |
DECREASING — Progressive fragility |
GROWING — Sustained Adaptation |
|
Circadian regulation |
COMPROMISED — Signal loss |
PRESERVED — Sufficient signal |
|
Mood |
VARIABLE — Oscillation without lens |
STABLE — Calm without "blackout" |
|
Multiple transitions/day |
PROBLEMS — Cumulative fatigue |
MANAGEABLE — Greater adaptation |
SECTION 05
Proposed mechanism: resilience through dosed exposure
The mechanism of action of the 50/50 lens can be formulated at three complementary levels:
1. Melanopsin/iPRGC signal preservation
The melanopsin pathway projects to the suprachiasmatic nucleus and to autonomic tone regulatory centers. The 50/50 lens maintains sufficient signal—attenuated but present—for this system to continue operating.3.4
2. Progressive sensory education, not isolation
A partial filter acts as "light physiotherapy": it decreases the load on the aggressive band (400–455 nm) but maintains controlled exposure on the functional band.5.6
3. Minimization of deregulation rebounds
By maintaining constant partial exposure to functional blue, the stimulus difference when the lens is removed is significantly smaller than in the total blockage scenario.
SECTION 06
50/50 Design Technical Specifications
The 50/50 concept translates into concrete spectral specifications for a daytime lens:
|
Spectral Range |
Target Transmission |
Physiological reason |
|
400–430 nm |
< 5–10% |
Maximum phototoxicity, no positive biological function |
|
430–455 nm |
< 20% |
LED peak zone; Significant Photoxic Potential |
|
455–480 nm |
40–60% |
"50/50" zone — functional signal for melanopsin |
|
480–500 nm |
≥ 70% |
Complete circadian signal; iPRGC peak sensitivity |
|
> 500 nm |
≥ 80% |
Green-red spectrum; Adjustable according to comfort |
6.1 Available technologies and materials
BPI therapeutic dyes (e.g. Diamond Dye 460/510): Curves with strong absorption in violet/blue; modulable density.12
Materials with built-in pigment (BluTech, Blue Zero, TechShield): Selective reduction from 400–455 nm.14,15,11,3
AR multilayer treatments with blue filter: Selective layers that preferably reflect 420–450 nm.
Figure 3 — Objective spectral specification of the 50/50 lens
Transmission (%) by wavelength with marked functional zones
SECTION 07
Field Cases: The Living Experience of Transitions
The cases that follow come from my direct experience helping people with electrohypersensitivity over the course of more than a decade. Names have been omitted to preserve privacy.
|
Case 1 — Female, EHS diagnosed Severe light sensitivity · Previous use of red/amber lenses for 14 months This person had been wearing red glasses with almost total blocking for more than a year. At first, she experiences enormous relief. But over time, the dependence deepened. If she took them off, even for a minute in a space with LED lights, he felt intense dizziness, tachycardia, and sometimes needed hours to recover. When she first started testing lenses with 50/50 features, the first two weeks she felt that the protection was "insufficient." But gradually, the transitions between environments stopped generating that cascade of symptoms of dysregulation and body decompensation. Today she can do activities that were previously unthinkable without red glasses, now she said: “I go from feeling artificially protected to feeling genuinely stronger.” |
|
Case 2 — Male, severe EHS with full light isolation Complete disconnection from the natural lighting environment · Permanent artificial red light in the home · Consistent yellow/red lenses outdoors This was a man who had made a radical decision to completely disconnect from any source of white or blue light. In his home he lived exclusively under artificial red light: all the light bulbs had been replaced, the windows covered with opaque filters, and the home environment had become a monochromatic camera obscura. When he left the house, he wore yellow glasses during the day and red at night. As the months went by, their tolerance to white light was reduced to disabling levels. The critical point came at a social event. At a party, someone took flash pictures near him and his partner. The flashes of the flashes (stimuli that anyone would tolerate) triggered a severe decompensation crisis: acute dizziness, tachycardia, disorientation, and an autonomic collapse that required hours of recovery in total darkness. This case represents the extreme consequences of total lockdown: a nervous system that, instead of strengthening, became so fragile that any accidental exposure became a physiological emergency. |
SECTION 08
Conclusion: train the nervous system with light, not against it
First: The 400–455 nm range concentrates most of the phototoxic potential of the visible spectrum.1,2,7,4,3
Second: The 455–500 nm range is irreplaceable for circadian synchronization and emotional stability. Chronically eliminating it is not harmless.4.3
Third: Well-designed partial filters can produce clinical benefits equivalent to or superior to those of total blockage.13
Fourth: In EHS and neurodivergent people, transitioning to 50/50 smart filtering can make the difference between constant decompensation and resilience recovery.
|
Appeal to the scientific community, manufacturers and clinicians It is critical that the scientific community, manufacturers of lenses and optical devices, as well as clinicians, review the way we approach the relationship between the nervous system and blue light. It is not simply a matter of adopting a dichotomous posture of "blue light yes" or "blue light no". This approach is insufficient and, in many cases, counterproductive for long-term health and well-being.
Our main objective should not be to block light completely, but to design optics and filters that interact intelligently and adapted with the real physiology of the nervous system. It is essential to understand that the nervous system needs to learn to live with light, not to reject it completely. An approach based on intelligent and balanced filtering, which considers the different functions and risks of each range of the visible spectrum, will strengthen resilience and adaptation, rather than foster fragility in the face of accidental exposures.
In short, the challenge is to develop optical solutions that respect the biological complexity of human vision, promoting the progressive adaptation and training of the nervous system in the face of light, instead of radically suppressing it. |
References
[1] Blue Light Lens Colour Guide — BlockBlueLight. blockbluelight.com
[2] Lens Color Guide for Blue Light Glasses — Bon Charge. boncharge.com
[3] The Scientific Principles and Purchasing Guide for Blue Light Blocking Glasses. oreateai.com
[4] Blue Light Sensitivity: Causes, Symptoms and Protection Strategies — TheraSpecs.
[5] Blue Light Sensitivity: Common Symptoms and Causes — Insight Vision OC.
[6] Electromagnetic hypersensitivity — Wikipedia.
[7] How Much of Hazardous Blue Light is Transmitted By Spectacle Lenses — PMC.
[8] Combat Digital Eye Strain with Zenni's Blokz+ Tints. zennioptical.com
[9] How To Test Blue Light Glasses At Home — BlockBlueLight.
[10] The Long-Term Effect of Blue-Light Blocking Spectacle Lenses — NIH/PMC.
[11] Zenni's New Colorful Lenses for Blue Light Protection — Review of Optometric Business.
[12] BPI Therapeutic Tints [PDF]. callbpi.com
[13] Partial blue light blocking glasses at night advanced sleep phase in children — PMC.
[14] Blue Light Lenses and Coatings — Laramy-K.
[15] TechShield Blue Light Lenses. techshieldar.com
[16] Haanes JV, et al. "Symptoms associated with environmental factors" (SAEF). J Psychosom Res. 2020;131:109955.
[17] NOXTAK. Electrohypersensitivity (EHS). noxtak.com
[18] Machado JJ. "Prevalence and Effects of Electrohypersensitivity: SPIRO Longitudinal Study of 357 Patients." DOI: 10.13140/RG.2.2.21974.11849
About the author
J. Joaquín Machado L.
Researcher in electromagnetic fields (EMF), inventor and founder of NOXTAK and the SPIRO project. Over the course of more than a decade, he has worked directly with thousands of people with EHS in more than 50 countries. Their longitudinal study with 357 EHS patients is one of the most extensive field investigations in this field. Author of the trilogy Without Fear of Voltage. Silicon Valley Gold Medal, Edison Award, German Innovation Award. The observations presented in this paper come from his direct experience helping populations with electromagnetic sensitivities. Its central position: the dialogue about artificial light must be broadened by seeking an intermediate point of balance that respects the physiology of the nervous system.
www.joaquinmachado.com · www.noxtak.com
Working Paper · February 2026 · v1.0
© 2026 J. Joaquín Machado / NOXTAK. All rights reserved.