In a groundbreaking advancement poised to redefine visual prosthetics, researchers have developed an innovative artificial retina capable of extending human visual perception into the near-infrared (NIR) spectrum. This novel implantable device integrates cutting-edge NIR-sensitive phototransistor arrays with ultrathin optical filters and soft, three-dimensional liquid metal (3D LM) electrodes. Together, these components create a seamless interface that can effectively stimulate retinal neurons under NIR illumination, offering new hope for individuals suffering from photoreceptor degenerative blindness.
At the core of this artificial retina lies the strategic fusion of NIR-sensitive phototransistors and flexible 3D LM electrodes. Unlike traditional rigid and solid-based electrodes, these liquid metal electrodes boast an exceptionally low Young’s modulus, closely matching the mechanical properties of biological tissues. This softness drastically reduces mechanical invasiveness, mitigating tissue damage that has long challenged implantable retinal devices. The result is a prosthesis that can be securely and comfortably implanted on the epiretinal surface with minimal disruption to the surrounding neural architecture.
Integral to the device’s unique functionality is the incorporation of an ultrathin near-infrared transmission filter. This sophisticated filter effectively blocks visible light wavelengths while allowing NIR light to pass through with high fidelity. By selectively filtering out visible spectrum light, the device can operate silently beneath a patient’s natural vision, ensuring that the implant does not interfere with any residual sight. This aspect is particularly crucial for users with partial visual function, preserving the delicate balance between artificial assistance and natural sensory input.
The efficacy of this artificial retina has been validated through rigorous ex vivo experiments conducted on both healthy and degenerated retinal tissues. These tests demonstrated that the device reliably elicits retinal responses upon NIR stimulation, indicating its potential to restore or at least supplement damaged photoreceptor function. Furthermore, chronic in vivo studies involving retinal ganglion cell (RGC) recordings and behavioral assays in murine models reveal that animals implanted with the device exhibited perception not only of visible light but also of near-infrared stimuli. This dual-spectral responsiveness opens unprecedented avenues for visual restoration and enhancement.
Clinically, one of the most compelling applications of this technology targets patients with advanced retinitis pigmentosa, a debilitating condition marked by progressive loss of photoreceptors while preserving the inner retinal neuronal layers. For such patients, conventional prostheses often fail to deliver functional vision due to the absence of residual photoreceptor activity. The newly developed NIR-perceptive artificial retina circumvents this limitation by establishing an independent visual channel based on near-infrared light. This functionality enables affected individuals to perceive their environment in low-light or dark conditions using the implant, dramatically improving their quality of life.
To optimize the device’s performance in real-world, dynamic lighting environments, the researchers are exploring multilayer optical filtering strategies that harness advanced photonic engineering concepts. By stacking alternating thin films of silicon dioxide (SiO2) and amorphous silicon, these multilayer filters can selectively modulate wavelength transmittance and incident angle sensitivity. Such precise bandpass control significantly suppresses background noise from solar NIR radiation and artificial sources, enhancing signal specificity and maintaining stable device operation amid challenging ambient lighting.
Although the current prototype is meticulously tuned for near-infrared light detection, the underlying architecture exhibits remarkable adaptability across the electromagnetic spectrum. By tailoring the phototransistor’s semiconductor channel material and reconfiguring the filter design, the device can be engineered to sense other wavelengths, including ultraviolet and visible light. This spectral versatility lays the foundation for customizable visual prosthetics that can be fine-tuned to match a user’s residual vision or desired perceptual enhancement.
Looking forward, the research team emphasizes the need to miniaturize the implant further and improve its flexibility by replacing conventional silicon channels with novel semiconducting nanomaterials. These materials not only offer heightened sensitivity to NIR light but also promise reduced power consumption, addressing two critical engineering challenges in wearable ocular prosthetics. Additionally, longevity and biocompatibility will be focal points of future in vivo longitudinal studies to ensure the device’s safety and stable performance over extended implantation periods.
This artificial retina exemplifies a synthesis of multidisciplinary innovation, drawing upon materials science, optoelectronics, neuroengineering, and biophotonics. It offers a minimally invasive yet highly effective interface between incoming optical stimuli and retinal neural circuits. By enabling NIR perception, the device transcends natural retinal limitations and opens possibilities for augmented human vision, as well as novel therapeutic interventions that harness non-visible electromagnetic spectra.
Furthermore, the use of bioinspired soft 3D LM electrodes revolutionizes electrical stimulation paradigms in ophthalmic prosthetics. Their liquid metal composition and 3D configuration improve charge injection efficiency while ensuring compliant mechanical coupling with retinal tissue. This breakthrough addresses the chronic challenges of electrode rigidity and scar formation, which have historically limited functional longevity and patient acceptance of retinal implants.
The ultrathin NIR-transmission filter incorporated into the device is a marvel of nanofabrication precision. Despite its minimal thickness, the filter exhibits exceptional optical selectivity, facilitating high transmittance of infrared light while maintaining near-complete opacity to visible wavelengths. This careful optical engineering protects the user’s natural vision and allows the device to operate transparently beneath or alongside native photoreceptors—a synergy critical for maximizing overall visual function.
Experimental results from animal models are promising, indicating not only the successful activation of retinal ganglion cells by NIR stimuli but also corresponding cortical responses consistent with visual perception. Behavioral tests further reinforce these findings, as mice implanted with the device actively respond to NIR illumination environments. These outcomes suggest the implant’s potential use beyond mere sensory restoration, possibly as an augmented vision platform harnessing wavelengths inaccessible to the human eye.
The social impact of this technology could be profound, particularly for patients with degenerative retinal diseases for whom current treatment options remain limited. By providing an additional spectral channel that supplements diminished natural vision, the implant could dramatically enhance independence and environmental awareness. Moreover, its compatibility with epiretinal implantation techniques facilitates relatively straightforward clinical translation, with minimized surgical risk and enhanced patient comfort.
Intriguingly, the device’s design principles could inform future development of multispectral or broadband retinal implants capable of perceiving a wide spectral range. This capability could enable novel sensory modalities or augmented reality experiences, merging biology with tailored optoelectronic enhancements. Fundamental advancements in optical filtering, soft electrode engineering, and semiconductor channel materials will be central to realizing these next-generation devices.
In summary, this epiretinal implant marks a significant leap toward practical, adaptable, and minimally invasive retinal prosthetics that function beyond the visible spectrum. Through sophisticated integration of NIR-sensitive phototransistors, ultrathin optical filters, and soft 3D liquid metal electrodes, it offers a promising avenue for restoring meaningful visual function in patients with severe photoreceptor loss. As research progresses, the device’s flexibility, biocompatibility, and spectral tunability hold great promise for expanding human visual capabilities and revolutionizing sensory neuroprosthetics.
Subject of Research: Development and evaluation of an implantable artificial retina capable of near-infrared light perception for visual restoration.
Article Title: An implantable epiretinal device for near-infrared light perception
Article References:
Chung, W.G., Jeong, I., Lee, E.J. et al. An implantable epiretinal device for near-infrared light perception. Nat Electron (2026). https://doi.org/10.1038/s41928-026-01601-8
Image Credits: AI Generated
DOI: https://doi.org/10.1038/s41928-026-01601-8
Tags: 3D liquid metal electrodesadvanced visual prosthetics designepiretinal implant devicesflexible retinal prostheticsimplantable artificial retinamechanical compliance in retinal implantsnear-infrared vision technologyNIR-sensitive phototransistor arraysphotoreceptor degenerative blindness treatmentretinal neuron stimulation technologysoft neural interface materialsultrathin optical filters for retina
