Periorbital transcutaneous electrical stimulation may reduce signs and symptoms of dry eye disease and enhance blinking, according to a review published in Contact Lens and Anterior Eye that synthesizes emerging ophthalmic studies and mechanistic evidence from other fields. Dry eye disease (DED) is a multifactorial ocular surface disorder characterized by tear film instability, inflammation, and neurosensory abnormalities. Transcutaneous electrical stimulation (TCES) has emerged as a potential adjunctive therapy for inefficient blinking and eyelid dysfunction. The study authors identified inefficient or abnormal blinking as an important etiological factor in dry eye disease, noting that reduced blink rate can increase tear evaporation and that incomplete blinking can impair meibomian gland function.

Evidence From Clinical Studies

The review synthesized findings from randomized controlled trials, prospective studies, and retrospective analyses evaluating TCES applied to the periorbital region. Across small and heterogeneous studies, TCES was associated with improvements in both subjective symptoms—measured by instruments such as the Ocular Surface Disease Index—and objective signs including tear breakup time, corneal fluorescein staining, and Schirmer testing. One randomized trial reported that greater improvements in signs and symptoms were observed in DED patients treated with this technology, compared with control patients who received only daily tear substitutes.

Several studies focused on quantum molecular resonance, which consists of a technology using low-intensity oscillating electrical fields of very high frequencies (4–64 MHz). These trials reported improvements in meibomian gland function, including increased gland expressibility, improved meibum quality, and greater lipid layer thickness. One randomized study found greater gains in noninvasive breakup time, lipid layer thickness, corneal staining, and tear film osmolarity in treated patients compared with controls using tear substitutes alone.

Effects on Ocular Pain

Analgesic effects were also observed. In retrospective analyses of patients with ocular pain related to DED, electrical stimulation reduced pain intensity by more than half shortly following treatment, with some studies reporting longer-term symptom improvement. A prospective randomized study evaluating postoperative patients found that low-frequency stimulation reduced pain at 1 week and improved tear film stability and staining outcomes at 4 and 12 weeks vs sham treatment.

Proposed Mechanisms of Action

Mechanistically, TCES is proposed to act through multiple pathways. Neuromuscular stimulation may improve orbicularis oculi muscle function, optimizing blink rate and completeness. Anti-inflammatory effects are suggested by reductions in matrix metalloproteinase-9 and proinflammatory cytokines. Increased microcirculation and stimulation of fibroblasts may contribute to tissue repair and eyelid tightening. One study examining dynamic muscle stimulation in patients with eyelid laxity reported a reduction in lid laxity of more than 50% and improvements in blink quality, tear breakup time, and symptom scores.

Study Limitations

The reviewed evidence was limited by small or modest sample sizes, short or limited follow-up, lack of masking or control groups in some studies, industry sponsorship in several studies, and limited ocular-specific mechanistic data. The authors concluded that TCES in the periorbital area may reduce signs and symptoms of DED and may represent a potential addition to management strategies. They noted that further clinical research and larger randomized clinical trials are needed to more directly demonstrate its effects, and that in vitro and animal studies are needed to clarify whether mechanisms observed in other fields apply to periocular use.