You shouldn’t need a $2,000 photometer to know if your desk light is ruining your eyes.

We are EYEIO. We build the light measurement tools that belong in every pocket, not every lab.

The Problem We See

Every day, 2.5 billion people stare at screens for more than eight hours. They sit under office lights that were designed for paper, not pixels. They read on phones in bed with ambient illuminance below 10 lux — and wonder why their eyes burn.

The science is settled. ISO 8995-1 demands 500 lux on every office desk. CIE S 008 defines the spectral weighting for circadian health. GB 40070 in China sets strict limits on display luminance for children. And yet, nobody measures.

Why? Because the tools are locked away. A professional lux meter costs as much as a used car. A spectroradiometer requires a PhD to operate. The people who suffer — office workers, students, gamers, parents — have no way to check.

“Up to 90% of digital device users experience symptoms of Computer Vision Syndrome. But we still treat light like it’s invisible.”

This is not a product gap. It is a knowledge gap. And it is costing us our vision.

What We Believe

We believe that every human being has a right to know the light they live in. Not in vague terms like “bright” or “dim” — but in exact, traceable, scientific units.

We believe that ISO 8995-1 is not a suggestion. It is a baseline for human dignity. 500 lux on the desk. 200 cd/m² wall luminance for comfort. A screen-to-background ratio below 60:1. These numbers should be as familiar as the speed limit.

We believe that a parent should be able to check a child’s desk lighting in ten seconds — not hire a lighting engineer. That a gamer should know their HDR display is actually delivering 600 nits, not 400. That an architect should be able to validate their design with a device that fits in a shirt pocket.

“The SLL Code defines standard color rendering index values of 20, 40, 60, 80, or 90. Cosine correction is essential for accurate illuminance measurement. These are not secrets. They are rights.”

And we believe that the iPhone in your hand — with its calibrated display, precise ambient light sensor, and computational power — is the most underutilized scientific instrument ever built.

The Bridge: From Standards to Seconds

We read the 200-page technical documents so you don’t have to. ISO 8995-1, CIE S 008, GB 40070, the SLL Code, the latest peer-reviewed research from Vision Research and Building and Environment. We distilled them into a single, universal truth: light can be measured with your phone.

EYEIO’s LuxMeter is not a toy. It uses the iPhone’s rear ambient light sensor with cosine correction — exactly as the SLL Code requires. It reports illuminance in lux, luminance in cd/m², and correlated color temperature in Kelvin. It checks your desk against ISO 8995-1 in a single tap. It measures your screen’s peak brightness in nits — without a separate photometer.

Research from 2024 shows that eye-level illuminance from VDT screens can vary by hundreds of lux depending on content and background. The VEET study from Meta Reality Labs proved that wearable light sensors can quantify visual experience with 20-gram devices. We took that same philosophy and put it in software.

“We turned 200 pages of ISO standards into a 5-second measurement on your iPhone. No extra hardware. No calibration certificate. Just truth.”

This is not a hack. This is the logical endpoint of a decade of sensor miniaturization and computational photography. The hardware is already there. We just gave it a voice.

The Future We’re Building

Imagine a world where no child develops myopia from bad desk lighting — because every parent can check lux levels in seconds. Where no gamer sacrifices eye health for ray tracing — because they know their screen is calibrated to 500 cd/m². Where no office worker suffers from Computer Vision Syndrome — because their employer uses a free app to validate 500 lux compliance.

Imagine a world where display calibration is as normal as checking the weather. Where HDR content actually looks like the creator intended — because viewers measure their peak luminance. Where architects design for human circadian rhythms — because they can measure melanopic EDI on site with a phone.

Research from 2017 showed that a non-uniform wall luminance of 200 cd/m² can reduce preferred desk illuminance by a statistically significant amount — enabling energy savings without sacrificing comfort. That insight should be actionable by every building manager, not just research labs.

“The VEET device achieves over 24 hours of continuous runtime at 0.5 Hz sampling with a 350 mAh battery. We don’t need a wearable. We need a philosophy.”

EYEIO is not a replacement for a $10,000 spectroradiometer. It is a replacement for ignorance. It is the democratization of measurement. It is the end of the era where light is a mystery.

The Invitation

This is not a call to buy a product. This is an invitation to join a movement.

If you have ever squinted at a screen and wondered why your eyes hurt — you are already part of the problem. Now you can be part of the solution.

Download LuxMeter. Measure your desk. Measure your child’s desk. Measure your phone at night. Compare it to ISO 8995-1. Compare it to the research that says ambient illuminance should be between 13.08 and 62.16 lux in the evening. Compare it to the finding that 500 lux ambient and 500 cd/m² display luminance deliver maximum visual comfort.

Then share what you find. Because the most powerful tool against ignorance is not a better sensor — it is a better question.

“The difference between a guess and a measurement is the difference between suffering and control.”

We are EYEIO. We build the light measurement tools that belong in every pocket, not every lab.