Scientists at University College London report that brief exposure to deep red light may partly restore age related vision losses, mainly in color detection, in healthy adults over 40. In the first human study, participants looked into a 670 nanometer light for a few minutes per day over two weeks and showed measurable gains in retinal function, while younger adults did not improve. The work builds on the idea that mitochondria, the cell structures that supply energy, slow with age in the eye and can be optically “recharged” by specific long wavelengths. Photoreceptors, the light sensing cells of the retina, are especially energy hungry, so even small energy boosts can change how they perform.
A later UCL experiment found that a single three minute exposure in the morning could improve color contrast sensitivity for about a week, with morning timing important for the effect. Together, these small studies suggest a simple, low cost method could help older adults see colors a bit more clearly.
Important limits remain. The trials were small, the benefits were modest and short term, and the approach has not been tested for common eye diseases. The authors recommend more and larger studies before any home use becomes routine. People should seek medical advice before trying light devices on their eyes.
Optically Improved Mitochondrial Function Redeems Aged Human Visual Decline – 2020
First human trial from UCL shows that deep red, 670 nm light exposure improved color contrast sensitivity and low light sensitivity in adults over about 40, with no effect in younger adults. Supports the idea that boosting mitochondrial energy can help aging photoreceptors.
Weeklong Improved Colour Contrasts Sensitivity After Single 670 nm Exposures Associated With Enhanced Mitochondrial Function – 2021
A single three minute exposure to 670 nm light in the morning improved color contrast sensitivity in healthy adults for up to a week, while afternoon exposure did not help, pointing to a time of day effect.
Declining Eyesight Improved by Looking at Deep Red Light, UCL News – June 29, 2020
University press release on the first human findings, explains the mitochondrial rationale and the simple, low cost LED device used in the trial.
Morning Exposure to Deep Red Light Improves Declining Eyesight, UCL News – November 24, 2021
University press release on the single exposure, morning timing study, noting short term gains in color vision that lasted about a week.
Red Light Improves Vision of Aging Eye, American Academy of Ophthalmology – February 1, 2022
Clinical perspective that the observed benefits from brief deep red light exposures are temporary and that more evidence is needed before recommending routine use.
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