October 22, 2025 - EyeClarity Blog
Recent studies are uncovering exciting potential for red-light therapy in maintaining and improving eye health—especially when it comes to the macular region of the retina, which is rich in cone photoreceptors. Let’s dive into three key research reports and what they could mean for you.
**1. Deep-red light improves cone function in aging eyes**
In a landmark study published in Scientific Reports (November 2021), researchers led by Harpreet Shinhmar found that a single 3-minute exposure to 670 nm red light, delivered in the morning (8–9 a.m.), produced significant improvements in colour contrast thresholds in adults aged 34–70. On average, participants saw a ~17% improvement in cone-mediated colour discrimination—and this effect was sustained for up to a week. https://pubmed.ncbi.nlm.nih.gov/34819619/
Interestingly, when the same wavelength was used in the afternoon, no improvement was found—highlighting the importance of timing in this intervention.
https://tinyurl.com/2c35ztvu
2. Photobiomodulation (PBM) in dry age-related macular degeneration (AMD)
A study by Rubens Camargo Siqueira et al. evaluated the effects of 670 nm LED light therapy in ten patients with dry AMD. They received nine sessions of PBM over a short term and were assessed at 1, 4, and 16 weeks. The results showed a statistically significant improvement in best-corrected visual acuity (from ~1.1 to ~0.98 LogMAR) and better macular perimetry measurements, with no adverse events reported. https://www.researchgate.net/publication/377606708_Photobiomodulation_Using_Light-Emitting_Diode_LED_for_Treatment_of_Retinal_Diseases
While the sample size was small and long-term outcomes are still being studied, the findings suggest that red-light PBM could enhance retinal function in early AMD cases.
3. Broader implications for retinal disease and mitochondrial health
A broader meta-analysis of photobiomodulation therapy (using red and near-infrared light) in ophthalmology suggests that long-wavelength light can enhance mitochondrial function, reduce oxidative stress and inflammation, and potentially slow the progression of retinal degeneration. https://www.aimspress.com/article/10.3934/biophy.2017.3.337
There is also emerging evidence that red-light therapy may have a role in conditions such as diabetic retinopathy and advanced AMD. However, larger clinical trials are still needed to confirm these applications.
Putting it together: Why this matters for your vision.
The retina—and particularly the macular cone photoreceptors—has one of the highest energy demands in the body. Aging and disease often compromise mitochondrial function, resulting in reduced ATP production and impaired visual performance. The research above suggests that carefully timed red-light exposure (especially around 670 nm) may “recharge” photoreceptor energy systems, improve functional vision (including contrast and acuity), and provide a non-invasive support strategy for early retinal challenges.
If you’re considering red-light therapy, ensure you use devices designed for eye safety, follow the recommended dosing and timing (morning appears critical), and coordinate with your eye care professional.
For those ready to take the next step in vision optimization, you can **order Dr. Berne’s Red Exercise Glasses** by contacting us at hello@drsamberne.com
And if you’d like to join a deeper dive into vision, therapy, and holistic eye care, sign up for our November 8th or November 12th workshops** (including our 2026 Kauaʻi retreat) here: https://www.drsamberne.com/workshop/
Bright vision ahead—
Dr. Sam Berne