The blue-light market is filled with confusion, exaggerated claims and misleading numbers. Our goal is simple: explain what we know, what we do not know, and how our lenses are engineered.
“Blue light” is often marketed as one specific threat. In reality, it spans a broad spectrum of visible wavelengths between 380 and 500 nanometers. Think of it like UV light: it is a category, not a single wavelength.
Treating all blue light as identical is scientifically inaccurate, as different wavelengths have different effects: shorter wavelengths are more closely associated with visual comfort, while longer wavelengths play a role in circadian responses to light. Eyegis addresses both dimensions within a single lens.
Research on photobiological hazards uses a wavelength-weighting function that peaks in the blue-violet region. This peak is linked to retinal light-hazard.
Different wavelengths interact differently with the human body, resulting in two different challenges.
Because the biological mechanisms and wavelength regions are different, Eyegis treats them as two complementary dimensions within every lens.
A headline such as “blocks 40%” or “blocks 90%” does not tell you where filtration happens.
Two lenses can show a similar overall percentage while behaving very differently across the blue-light spectrum.
What matters is not just how much is filtered, but where.
Color perception depends on the balance of visible wavelengths reaching the eye. As filtering becomes stronger, brightness and colour fidelity can be affected.
For some uses, that trade-off is acceptable. For others, it is not.
At Eyegis, the goal is not to block the highest possible percentage of blue light. It is to filter more selectively where it matters, while controlling the impact on brightness, colour and everyday comfort.
E-Guard Retina™ and E-Guard Circadian™ are complementary technologies integrated into every Eyegis lens, addressing both visual comfort and light exposure throughout the day.
The blue-violet region around 435–440 nm corresponds to the highest-energy part of the visible spectrum and is often associated with retinal photobiological concerns. E-Guard Retina™ targets this region with an intensity tailored to each lens, reducing exposure while preserving brightness and colors as much as possible.
Certain blue-light wavelengths also contribute to light signals that influence our biological clock. E-Guard Circadian™ targets this region of the spectrum, with stronger filtering when digital use extends into the evening.
The E-Guard Retina™ and E-Guard Circadian™ scores are proprietary Eyegis indicators.
They are inspired by published scientific literature, including work from the Commission Internationale de l’Éclairage (CIE) and research on circadian light exposure.
They are not medical certifications and should not be interpreted as medical claims. Instead, they provide a simple way to compare how different lenses perform on two distinct dimensions.
→ blue-violet filtering
→ circadian-related blue-light filtering
Because blue light is more complex than most brands make it sound, we believe understanding the science matters.
At Eyegis, we do not rely on marketing claims or estimated filtering percentages. Every lens design is verified through independent laboratory testing to measure how it performs across the visible spectrum.
We measure what actually matters—not just the numbers that look good in advertisements.
Measures exactly how much light passes through the lens at every wavelength, allowing retinal and circadian filtering performance to be evaluated.
Verifies that UVA and UVB radiation is effectively blocked while maintaining the intended visible-light transmission.
Determines how much visible light reaches the eyes, confirming the intended balance between comfort and brightness.
Evaluates chromatic performance using internationally recognized colorimetric criteria, including traffic-signal recognition where applicable, to preserve accurate recognition of red, yellow and green signals.
Confirms performance against the applicable requirements of recognized eyewear standards.
A single “Blue Light Blocked %” tells only part of the story.
A complete transmission spectrum reveals which wavelengths are filtered, how much visible light remains, how colors are preserved and whether the lens meets applicable safety requirements.
The laboratory spectrum is then used to calculate our proprietary E-Guard Retina™ and E-Guard Circadian™ scores, making complex optical measurements easier to understand without oversimplifying the science.
We do not engineer lenses to maximize marketing numbers.
We engineer them to maximize the balance between science, comfort and everyday usability.