These Smart Glasses Read Your Mental Health Through Your Pupils — Without a Camera

A 24-year-old biomedical engineer has built glasses that detect anxiety, depression, and ADHD by tracking your pupils — and they don't use a camera. Carolina Instruments, a startup spun out of UNC-Chapel Hill, uses infrared light instead of video to measure pupil size and eye movement in real time, turning the oldest window into the human mind into a wearable you could mistake for regular glasses.

Here's what makes this matter beyond the lab: your pupils change before your behavior does.

Your Eyes Know Before You Do

Most mental health diagnosis still works like this: you feel bad, you tell someone, they ask you questions, and you get a label weeks or months later. It's slow, subjective, and misses people who don't know they need help — or won't ask for it.

Your pupils don't wait for you to make an appointment.

When your brain enters a heightened state — stress, fear, cognitive overload — your pupils respond within milliseconds. They dilate when you're aroused, constrict when you're calm. This isn't new science. Eckhard Hess described the link between pupil dilation and mental effort in 1964. What's new is making that measurement portable, continuous, and cheap.

"The eyes give us a window into how people experience the world," says Ellora McTaggart, Carolina Instruments' co-founder and CEO. "My hope is that making pupil measurements more accessible will add context beyond performance-based assessments, which often don't tell the full story."

McTaggart knows this personally. She was diagnosed with ADHD during her sophomore year at UNC. For years, she'd handed in exams with blank answers — not because she didn't understand the material, but because timed tests didn't match how her brain processed information.

Camera-Free Is the Breakthrough

Eye-tracking technology has existed for decades. The problem has always been the same: cameras are bulky, sensitive to lighting, and miss data when people blink or look away. Clinical eye-trackers can cost tens of thousands of dollars and require controlled lab conditions.

Carolina Instruments solved this by skipping the camera entirely. Their "Pupil-Light" system converts infrared light signals directly into pupil measurements. No video processing. No lighting sensitivity. No gaps.

The result looks like ordinary black-rimmed glasses with a few metallic components along the bridge. You'd walk past someone wearing them and never know they were being neurologically monitored.

Dr. Jose Rodríguez-Romaguera, a neuroscience professor at UNC and Carolina Instruments co-founder, explains why the portability matters: "We're trying to identify the neural circuits that modulate arousal, which then go on to modulate behavior. To do that, we need to be able to record and track internal bodily states before behavior happens."

Before. That's the key word. Not after someone has a panic attack. Not after months of depressive episodes. Before the behavior becomes visible at all.

The Science Is Already There

A 2025 review in Acta Psychologica confirmed what neuroscientists have been building toward for years: pupillometry is a "uniquely sensitive biomarker" for cognitive functions, emotional states, and individual differences in how brains work.

The applications stretch further than you'd expect. Researchers at Stevens Institute of Technology built PupilSense, a system that uses smartphone front-facing cameras to detect depressive episodes from pupil responses. Their best model hit 76% accuracy at flagging when someone was genuinely depressed — using just their phone's selfie camera during normal use.

A January 2026 study in Sensors combined AI with iris identification and pupillometry for real-time depression detection. Nature published research showing pupil dilation predicts self-regulation success. Another study found pupil size reflects memory encoding — your eyes literally widen when you're learning something well.

Each finding points in the same direction: your pupils are broadcasting your mental state constantly. The technology to listen just needed to catch up.

A $17.9 Billion Question

The mental health wearables market was worth $4.3 billion in 2024 and is projected to hit $17.9 billion by 2035, growing at nearly 14% annually. Stress tracking devices alone represent a $3.5 billion market in 2026.

Most of that market runs on heart rate variability, skin conductance, and sleep patterns. Whoop, Oura, and Apple Watch all track stress through your body. None of them look at your brain through your eyes.

That's Carolina Instruments' gap. Pupil data sits closer to the source — the neural circuits themselves — than any wristband measurement. Heart rate tells you something happened. Pupils tell you what's happening neurologically, and they do it faster.

The startup is currently focused on research customers: university labs, clinical trials, pharmaceutical companies running drug efficacy studies. McTaggart and her co-founders see applications stretching into VR/AR, defense, automotive safety, and eventually direct-to-consumer mental health monitoring.

The Part That Should Make You Pause

One in five American adults experiences mental illness each year. Global depression rates have climbed 25% since 2020. And the average delay between onset of mental illness and treatment is still 11 years.

Eleven years.

A pair of glasses that catches the neural signature of a depressive episode before the person knows they're in one could collapse that gap dramatically. Not as a replacement for psychiatrists — but as an early warning system that says something has shifted, pay attention.

McTaggart didn't build this in a vacuum. She built it because the system that was supposed to catch her ADHD took years to do so, and the tools that existed to measure brain states were too expensive and too fragile for the real world.

The glasses on her face right now cost a fraction of a clinical eye-tracker and work outside a lab. They're not a consumer product yet. But the science behind them has been validated for sixty years, and the engineering just caught up.

Your pupils have been telling your story the whole time. Someone finally built something small enough to listen.