As millions approach and pass the age of 40, the gradual decline in eyesight becomes a common frustration. This can manifest as difficulty reading small print on menus, screens, or packaging, and a general dimming of vision. This natural aging process, known as presbyopia, occurs when the eye's lens becomes less flexible, making close-up focusing more challenging. While glasses have long been the primary solution, a burgeoning field of research into photobiomodulation, specifically using red light, is showing potential for improving eye function.
Photobiomodulation employs specific wavelengths of light, particularly red light (up to 750nm), to stimulate cells in the retina. The aim is to enhance their function and potentially slow vision loss. A 2021 study conducted at University College London (UCL) with 20 adults aged 34 to 70 found noticeable improvements in vision after participants exposed their eyes to a 670nm wavelength of red light for three minutes each morning over two weeks.
Mitochondrial Function and Red Light
The key to this potential benefit appears to lie in the mitochondria, the energy-producing powerhouses within cells. Previous work by the same UCL team indicated that brief exposure to red light could restore visual function in aging eyes by positively impacting mitochondria. The 2021 study further suggested that a single three-minute morning exposure to red light was sufficient to boost mitochondrial performance, thereby enhancing the sensitivity of rod cells (for low-light vision) and cone cells (for color vision).
Interestingly, the timing of exposure seems critical. Afternoon exposure to the same light did not yield similar improvements, possibly due to shifts in the mitochondria's work patterns, as observed in fruit fly research from 2019.
At-Home Devices and Expert Opinions
These research findings have led to the development of various at-home red-light devices, with prices ranging widely. Professor Glen Jeffery, who led the UCL studies, has advised caution in navigating this market. He noted that many devices, some of which are expensive, often exhibit questionable quality and may emit excessive power. However, he identified one device, the £85 "Eyepower Red glasses," as appearing to be reasonably priced and better calibrated for eye use, stating, "Eyepower Red glasses were one of a few devices I pulled apart – and a rarity, they were good."
The Eyepower Red glasses claim to emit a 670nm deep red light, which they assert promotes long-term eye health and improves mitochondrial efficiency. The manufacturer acknowledges that research in this area is still in its early stages but has produced promising results. While the glasses are promoted for potential use after cataract surgery or for conditions like macular degeneration and glaucoma, there is currently no clinical evidence to support their efficacy for these specific conditions.
Broader Research and Cautious Optimism
Research into photobiomodulation for other eye conditions is ongoing. Some studies have shown promise for dry age-related macular degeneration (AMD), with a device called the Valeda Light Delivery System demonstrating a significant reduction in disease progression in a US study. Additionally, research from China in 2022 suggested red light therapy could slow the progression of short-sightedness in children, though long-term evidence remains limited.
One individual who trialed the Eyepower Red glasses reported that after four weeks of twice-weekly use, they experienced an easier time glancing at their phone without glasses and a sharper visual perception while driving at night. Professor Jeffery noted that such improvements in dark adaptation and color perception are potential outcomes, emphasizing the need for consistent, weekly use as effects are not permanent.
However, not all experts are convinced. Mfazo Hove, a consultant ophthalmic surgeon, described red light therapy as a "real field of science, not a fad," but highlighted that the evidence is uneven across different applications. He stated that while the UCL research on mitochondrial biology was interesting, he would not consider red light an established treatment based on a study of 20 individuals without eye disease. Hove stressed the importance of conventional eye care, including regular check-ups, managing blood pressure and blood sugar, not smoking, and UV protection.
The manufacturer of the Eyepower Red glasses also concedes that sufficient clinical trials have yet to confirm definitive curative properties. While awaiting further developments, consistent use of the glasses for maintenance remains an option for those interested.