This Retinal Implant Lets Humans See Near-infrared

Beyond Natural Vision: Yonsei University’s Liquid-Metal Artificial Retina Pioneers Infrared Perception in Blind Patients

Estimated reading time: 10 minutes

Key Takeaways

• The infrared retinal implant developed by researchers at Yonsei University and South Korea’s Institute for Basic Science (IBS) can detect near-infrared (NIR) light and convert it into electrical signals that stimulate surviving retinal cells.
• It uses 3D liquid metal micropillar electrodes designed to reduce mechanical tissue damage while improving contact with retinal ganglion cells.
• Early testing in retinal tissue and blind mice showed neural responses in the visual cortex and behavioral responses to light stimuli.
• The device may open a new sensory channel for humans: the ability to perceive infrared light.
• Further safety, durability, signal refinement, and regulatory work is needed before human trials and patient availability.

Introduction: A New Era for the Infrared Retinal Implant

The infrared retinal implant developed by researchers at Yonsei University and South Korea’s Institute for Basic Science (IBS) is not just a step forward in restoring sight — it is a leap into entirely new territory for human perception.

Published in Nature Electronics on April 12, 2026, this breakthrough device can detect near-infrared (NIR) light and convert it into electrical signals that stimulate surviving retinal cells. For millions of people living with blindness caused by photoreceptor degeneration, this could mean regaining the ability to sense light — and possibly much more.

What makes this device truly extraordinary is that it does not just attempt to rebuild what was lost. It may open a new sensory channel that humans have never had before — the ability to perceive infrared light, a capability found naturally in snakes and some other animals, but never in people.

This article breaks down how the device works, what the early results mean, and why this matters for the future of bioelectronic vision restoration.

Section 1: What Is Near-Infrared Vision Restoration and Why Does It Matter?

The Problem: Retinal Degeneration Destroys Photoreceptor Cells

The retina is a thin layer of tissue at the back of the eye. It is packed with photoreceptor cells — rods and cones — that catch light and turn it into electrical signals the brain can read.

Diseases like retinitis pigmentosa and age-related macular degeneration (AMD) destroy these photoreceptor cells over time. Once they are gone, the person becomes blind.

But here is something important: in most cases of retinal degeneration, retinal ganglion cells (RGCs) — the cells that carry visual signals from the eye to the brain — often survive. They are still functional. They just have nothing to work with because the photoreceptors are gone.

This is exactly the gap that near-infrared vision restoration technology aims to fill.

Why Near-Infrared Light?

Near-infrared light sits just beyond what the human eye can naturally see. It is invisible to us but is all around us — emitted by warm bodies, electronics, and the sun.

By designing an implant that detects NIR light and converts it into electrical signals for surviving ganglion cells, the Yonsei team found a way to:

• Bypass the damaged photoreceptors entirely
• Stimulate the healthy ganglion cells directly
• Avoid interfering with any remaining natural vision

This approach is a major advance over earlier retinal prosthetics, which often competed with or disrupted whatever residual vision a patient had left.

A Growing Global Need

The scale of this problem is enormous:

• Retinitis pigmentosa alone affects approximately 1 in 4,000 people worldwide
• The global retinal prosthetics market was valued at USD 271.31 million in 2024
• That market is projected to reach USD 644.39 million by 2032, growing at an 11.40% CAGR
• The broader artificial retina market is expected to grow from USD 238.5 million (2024) to USD 1,586.6 million by 2035 — an 18.8% CAGR

These numbers reflect a world urgently searching for solutions to vision loss caused by photoreceptor degeneration.

global retinal prosthetics market
artificial retina market

Section 2: How Liquid Metal Electrode Implants Work in the Artificial Retina

The Device: Three Core Components

The Yonsei artificial retina is thin, flexible, and designed to sit directly on the epiretinal surface — the inner surface of the retina. It is made up of three integrated components:

1. NIR-sensitive phototransistor array — A grid of tiny, light-sensitive devices that detect near-infrared light and convert it into electrical signals.
2. Ultrathin NIR-transmission filter — This filters out visible light interference so the device responds specifically to NIR signals without disrupting the patient’s remaining natural vision.
3. 3D liquid metal micropillar electrodes — Soft, pillar-shaped structures made from a conductive liquid metal alloy that physically reach toward and stimulate the retinal ganglion cells.

Why Liquid Metal Electrodes Are a Game Changer

Previous retinal implants used rigid electrodes — hard, stiff structures that pressed against delicate retinal tissue. The problem? Rigid materials cause mechanical damage over time. The tissue gets irritated, inflamed, or scarred.

The liquid metal micropillar electrodes in this new device solve that problem through material science:

• They have a low Young’s modulus — meaning they are soft and elastic, not stiff
• This allows the electrodes to conform to the natural curves and contours of the living retinal tissue
• They make closer, more intimate contact with the ganglion cells, improving signal delivery
• They cause significantly less mechanical tissue damage than conventional rigid prosthetics

The result is a bioelectronic retinal prosthetic that is both more effective and safer for the biological tissue it is embedded in.

Targeting Ganglion Cells — Not Photoreceptors

A key strategic decision in this design is the target cell type. Rather than trying to replace or regenerate photoreceptor cells — which is enormously complex — the device skips straight to the retinal ganglion cells.

RGCs are the final output layer of the retina. They collect processed visual information and send it via the optic nerve to the brain’s visual cortex. By targeting RGCs directly, the implant:

• Avoids the complexity of replicating all the intermediate retinal processing layers
• Works with the natural neural architecture that is still intact
• Delivers electrical stimulation that the brain can interpret as visual input

“The liquid metal electrodes enhance proximity to retinal ganglion cells, providing effective charge injection while minimizing tissue damage, owing to their low Young’s modulus.” — Won Gi Chung, Inhea Jeong et al., Nature Electronics, 2026

Nature Electronics article

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Section 3: Bioelectronic Retinal Prosthetics — Early Results and What They Showed

Testing the Device: From Lab Tissue to Living Animals

The research team ran two types of tests to validate their bioelectronic retinal prosthetic:

Ex vivo testing (outside a living body):

• The device was attached to extracted retinal tissue
• Results confirmed biocompatibility — the device did not cause toxic reactions, cell death, or inflammation in the tissue
• This is a critical safety milestone for any implanted medical device

In vivo testing (inside living animals):

• The device was tested in both healthy mice and blind mice with photoreceptor degeneration
• Researchers monitored cortical recordings (brain activity in the visual cortex) and observed behavioral responses to light
• In blind mice fitted with the implant, both visible and NIR light triggered neural responses in the visual cortex
• Behavioral tests showed the blind mice responding to light stimuli — evidence that light perception had been meaningfully restored

End-to-End Neural Pathway Confirmed

One of the most significant findings was the confirmation of an end-to-end neural pathway:

• When NIR light hit the implant, the phototransistor array generated electrical signals
• Those signals traveled through the liquid metal electrodes to the ganglion cells
• The ganglion cells fired and sent signals up the optic nerve
• The visual cortex of the brain activated in synchrony with the retinal stimulation

This simultaneous activation between the implanted retina and the visual cortex is powerful evidence that the device is not just stimulating random electrical noise — it is creating a functional visual signal chain from implant to brain.

Safety Profile: A Key Differentiator

Industry analysts point to safety profile as one of the most important factors in patient adoption of retinal implants. This device stands out because:

• Its soft, flexible construction avoids the mechanical irritation common with rigid prosthetics
• It does not interfere with residual natural vision, preserving whatever sight the patient retains
• Early biocompatibility data suggests a low risk of tissue rejection or damage

These properties distinguish it from competing technologies like the IRIS II system from Pixium Vision (which uses 150 electrodes) and Stanford-led subretinal arrays, which are advancing in parallel but often face greater biocompatibility challenges.

Nature Electronics article
nanotech visual implant
ScienceDaily release

Section 4: Expanding Human Senses — The NIR Visual Channel and Beyond

Not Just Restoration — Expansion of Human Perception

Here is where this technology becomes genuinely extraordinary.

The human eye has never been able to see infrared light. But with this implant, people with photoreceptor degeneration could potentially gain a brand new sensory channel — the ability to perceive NIR light.

What would that feel like? Researchers are honest: they do not yet know exactly what the brain would experience when ganglion cells are stimulated by NIR-derived signals. The visual perceptions arising from this kind of artificial stimulation are still being studied.

But the potential applications are already clear:

• Thermal signature perception — Warm bodies and objects emit infrared radiation. A person with NIR vision could potentially sense people or animals in complete darkness.
• Night-vision capabilities — Near-infrared is used extensively in night-vision technology. An implant that perceives NIR could function as a biological night-vision system.
• Military and industrial applications — Surveillance, navigation in low-light environments, and detection of heat signatures are all areas where NIR perception would be valuable.
• Everyday safety — Detecting the heat of a fire or a hot surface before making physical contact.

A Sensory Frontier That Has Only Existed in Animals

Until now, perceiving infrared light has been a capability reserved for certain animals:

• Pit vipers and pythons have specialized heat-sensing pit organs
• Some insects can perceive near-infrared wavelengths
• Vampire bats have warm-receptor neurons tuned to infrared

The Yonsei implant could potentially give humans a version of this capability for the first time — not through genetic modification or surgery to the brain, but through a thin, flexible device attached to surviving retinal tissue.

The Market and Strategic Landscape

The commercial landscape for this technology is heating up rapidly:

• The smart retinal implants market is projected to reach USD 79.11 billion by 2032 from USD 48.22 billion in 2025 (an 8.11% CAGR)
• Competitors including Pixium Vision, Stanford research teams, and others are racing to bring retinal prosthetics to market
• The PRIMA subretinal system reported over 80% meaningful central vision recovery in a 2026 clinical trial
• South Korea’s collaborative research ecosystem — spanning Yonsei University, IBS, and multiple partner institutes — is positioning the country as a global leader in bioelectronic vision restoration

Three enabling trends are converging to accelerate this field:

1. Miniaturization and AI integration — smaller, smarter devices improving patient outcomes
2. Biocompatible material science — reducing rejection and mechanical damage
3. Expanding clinical trial pipelines — more devices moving toward human testing and approval

smart retinal implants market
retinal implants market
artificial retina market

Section 5: What Comes Next for the Infrared Retinal Implant

The Road to Human Trials

The current findings are promising but still preliminary. The researchers are clear about what still needs to happen before this device can be used in humans:

• Extended in vivo safety studies — longer-term animal testing to confirm the device remains safe and effective over months and years
• Durability testing — confirming the liquid metal electrodes and phototransistor arrays maintain function inside a biological environment
• Signal quality refinement — improving the resolution and clarity of the visual information the device can deliver
• Regulatory approval pathways — navigating medical device approval processes in South Korea, the US FDA, and the EU

Challenges Ahead

The team and broader industry face several honest challenges:

• Cost reduction — current retinal implant technology is expensive, limiting access to wealthy markets and well-funded healthcare systems
• Broader accessibility — ensuring this technology reaches patients in low- and middle-income countries where retinal disease burden is also high
• Understanding NIR perception — researchers need to better understand what humans actually experience when ganglion cells are stimulated by NIR-derived signals before designing effective user interfaces or training protocols
• Long-term biocompatibility — even with the soft liquid metal design, multi-year implantation studies are needed

Why This Research Represents a Major Shift

What sets the Yonsei infrared retinal implant apart from earlier prosthetics is its dual capability: it does not force a patient to choose between restoring lost vision and gaining new sensory capability.

Because the device targets ganglion cells using NIR light — rather than attempting to reconstruct the full photoreceptor cascade — it operates alongside remaining natural vision, not in competition with it.

This design philosophy reflects a broader shift in bioelectronic medicine: instead of trying to perfectly replicate biological systems, the best devices are learning to work with the surviving biology in smarter, more targeted ways.

Nature Electronics article
global retinal prosthetics market

FAQ: 10 Questions About the Infrared Retinal Implant

Conclusion

The infrared retinal implant from Yonsei University and IBS is one of the most exciting developments in bioelectronic medicine in years.

It does not just offer a path to near-infrared vision restoration for people blinded by photoreceptor degeneration. It hints at something bigger: a future where medical implants do not just fix what is broken, but expand the boundaries of human sensory experience.

The convergence of soft liquid metal electrode implants, precision targeting of retinal ganglion cells, and a design that preserves remaining natural vision makes this device stand out in a rapidly advancing field.

As the retinal prosthetics market races toward billions in value and clinical pipelines fill with promising candidates, the Yonsei team’s work represents a clear marker of where this technology is heading — not just toward seeing again, but toward seeing more.

Published in Nature Electronics, April 12, 2026. DOI: 10.1038/s41928-026-01601-8