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A group of Australian scientists from the University of New South Wales (UNSW) Sydney is exploring the possibility of implanting miniature solar panels into people’s eyeballs, which could revolutionize the treatment of incurable eye diseases.
Solar-Powered Eyes for the Future?
Neuroprosthetics, devices that restore lost functionality interacting with the nervous system, offer promising avenues for enhancing quality of life.
The concept drew parallels with the widely recognized cochlear implant, which converts sound into electrical signals to stimulate the auditory nerve in individuals with severe hearing impairment.
Researchers from various areas, including engineers, neuroscientists, clinicians, and biotech experts, envision leveraging this technology to address visual impairments caused damaged photoreceptors-cells responsible for detecting light and color.
Dr. Udo Roemer, a specialist in photovoltaics, or solar panel technology, led the investigation at UNSW. Individuals afflicted with conditions like retinitis pigmentosa and age-related macular degeneration experience gradual vision loss as their photoreceptors deteriorate.
Roemer proposes a novel approach to bypass damaged photoreceptors harnessing solar technology to convert light entering the eye into electricity, facilitating the transmission of visual information to the brain.
Traditional methods involving electrode-based implants necessitate complex procedures with wires inserted into the eye. In contrast, Roemer’s concept involves affixing a miniature solar panel to the eyeball, eliminating the need for cumbersome wires.
This self-powered and portable solution aims to convert light directly into electric impulses, which the brain interprets as visual stimuli.
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Solar Cell Integration for Vision Restoration
While previous research has explored solar cell integration for vision restoration, Roemer’s focus now shifts toward semiconductor materials like gallium arsenide and gallium indium phosphide.
These materials offer greater flexibility in tuning properties compared to conventional silicon-based devices. Roemer emphasizes the need for higher voltages to stimulate neurons, necessitating the stacking of multiple solar cells.
The current research is in the proof-of-concept stage, with initial experiments demonstrating the successful stacking of two solar cells on a large surface area in the lab.
The next phase involves miniaturizing these cells into pixels suitable for vision restoration, followed integrating additional solar cells to enhance voltage output.
Roemer envisions future iterations of the technology to be approximately 2mm² in size, with pixel dimensions of around 50 micrometers. However, significant hurdles remain before clinical implementation, including extensive laboratory testing and validation in animal models.
Moreover, challenges related to the intensity of sunlight necessitate supplementary devices like goggles or smart glasses to amplify solar signals for reliable neuronal stimulation.
While the prospect of solar-powered vision restoration offers hope for individuals with degenerative eye diseases, practical implementation awaits further advancements and rigorous evaluation.
“One thing to note is that even with the efficiencies of stacked solar cells, sunlight alone may not be strong enough to work with these solar cells implanted in the retina,” Roemer said in a statement.
“People may have to wear some sort of goggles or smart glasses that work in tandem with the solar cells that are able to amplify the sun signal into the required intensity needed to reliably stimulate neurons in the eye,” he added.
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