Red Light Therapy for Dry Eyes: Scientific Evidence

Among 17 patients averaging 61 years of age, a 2023 clinical trial tested an at-home low-level light therapy (LLLT) mask for dry eye caused by blocked oil glands in the eyelids. The mask delivered 585 to 665 nm light at 28 to 42 mW/cm² and 25.6 to 38.4 J/cm² across 4 sessions of 15 to 17 minutes given every other day over a week. The study found that tear-film stability and tear volume rose and symptoms eased, while the amount of oil-gland loss did not change. No adverse events occurred.

Whether adding low-level light therapy (LLLT) to intense pulsed light helps more than pulsed light alone was tested in a 2022 clinical trial of dry eye from blocked oil glands. 62 patients, split into 2 groups of 31, received 3 sessions: one group got pulsed light followed by 15 minutes of 620 to 780 nm red light, and the other pulsed light alone, with checks 3 weeks after the last session. Both groups improved in symptoms and in the oily layer of the tear film, while only the combined group appeared to gain in tear production, a benefit the study rated as weak. No significant side effects were noted.

Across 52 eyes from 26 patients, a 2022 observational study tested a device combining intense pulsed light and low-level light therapy (LLLT) for dry eye caused by blocked oil glands in the eyelids. Patients received 2 to 5 sessions of 620 to 780 nm and 1200 to 1500 nm light and were reassessed 3 to 5 weeks after the last one. According to the study, tear-film stability rose from about 7 to 9 seconds, oil-gland severity scores dropped, and 90% of eyes moved to a lower severity band. No eye or facial side effects were noted.

Comparing near-infrared light against a placebo, a 2022 randomized controlled trial tested low-level light therapy (LLLT) for dry eye and the blocked oil glands behind it in 40 patients averaging about 44 years of age, most of them women. The 20 people in the treatment group received 590 and 830 nm light to the closed eyelids and the area around the eyes from about 6.7 inches away, at 100 mW/cm² and up to 60 J/cm², in sessions of 1 to 10 minutes given twice a week for 3 weeks, while 20 others used a sham device. The trial found that the main measure of surface damage on the eye improved more with real light than with the sham, along with better tear production and eyelid oil-gland readings. No serious adverse events were observed.

231 people whose dry eye had resisted standard care took part in a 2021 observational study of intense pulsed light combined with low-level light therapy (LLLT). Over 3 months, they received 4 combined sessions, each with 15 minutes of red light at 600 to 643 nm around the eyes, and were followed for up to 15 months. On a dry-eye symptom questionnaire, scores appeared to fall by about 44 points after treatment and to hold 30 points below the starting level a year later, as the tear film grew more stable and the tears less salty. No adverse effects were reported.

Added to standard care for a mucus-pulling eye habit tied to dry eye, low-level light therapy (LLLT) was tried in 2 women in a 2025 clinical trial. A 32-year-old and a 50-year-old received 15 minutes of 623 to 643 nm light around the eyes at 15 mW/cm², one across 4 sessions and the other across 5, alongside eyelid hygiene, tear drops, and anti-inflammatory drops. Both women appeared to improve, though the light therapy's own share of that gain could not be told apart from the rest of the care. No side effects were reported.

Dry eye disease stood among the conditions with the firmest evidence for light therapy, according to a 2025 review of eye uses of photobiomodulation (PBM). The review sorted uses of red and near-infrared light in the 620 to 780 nm range into established ones, including dry eye and a form of macular degeneration, and still-experimental ones such as diabetes-related swelling at the back of the eye. The authors concluded that the therapy is promising for dry eye but that its long-term benefit and safety are not yet proven. Larger controlled trials and standard treatment guidelines are still needed.

No greater warming than a warm compress followed light therapy in a 2024 randomized controlled trial of eyelid temperature and tear-film stability in mild dry eye. 35 adults averaging 27 years of age were split into a 633 nm light-mask group treated for 15 minutes, a warm-compress group treated for 10 minutes, and an inactive-mask control, with eyelid temperature and tear-film stability measured before and after a single session. A single light session raised eyelid temperature right away, though the increase appeared no greater than the warm compress produced. This hinted that warming may be part of how the therapy works.

A 2021 review weighed how well low-level light therapy (LLLT) works for dry eye disease and the blocked oil glands in the eyelids that often drive it, drawing on 370 people across 4 studies. The included work applied red and near-infrared light from 600 to 901 nm to the eyelids at 100 mW/cm² and 90 J/cm², in 15-minute sessions given 2 to 7 times per week over about 42 days. The review found no reliable evidence that LLLT helps on its own, pointing to the small number of studies and their design flaws. It noted few safety concerns, while cautioning that some devices may heat the tissue enough to fall outside true light therapy.