A wearable, drug-free approach to treating brain disorders through the eye represents a new frontier in neurotherapy.
Contact Lens Device Shows Promise for Depression
A study published in Cell Reports Physical Science details a contact lens-based device that delivers electrical stimulation to the brain via the eye. In a mouse model, the treatment successfully reversed behavioral and neurological deficits associated with depression.
How It Works
Researchers at Yonsei University developed a contact lens that applies transcorneal electrical stimulation (TES) using temporal interference (TI).
- The device delivers two separate electrical signals to the retina.
- These signals only intersect at targeted brain regions.
- This allows for focused stimulation of deep brain areas without affecting surrounding tissue.
- The current version of the device uses a wired setup for precise control.
Results in Mice
In mice with induced depression-like behavior and impaired vision, the treatment produced significant results:
"The treatment reversed depression-like behavior, restored behavioral resilience, and normalized prefrontal-hippocampal oscillatory synchrony."
- Reduced depression-like behavior
- Restoration of behavioral resilience
- Normalization of prefrontal-hippocampal oscillatory synchrony
- Normalization of depression-related biomarkers
Machine learning analysis categorized treated mice alongside non-depressed control groups, confirming the treatment's effectiveness.
Limitations and Future Research
Lead author Jang-Ung Park, PhD, from Yonsei University, stated that the work represents "a new approach to treating brain disorders through the eye" and described the method as wearable and drug-free. Park also noted the need for rigorous clinical evaluation prior to any market availability.
The study authors acknowledge several limitations:
- The mouse model's damaged photoreceptors mean the method has not been tested in healthy vision
- Animal models of depression do not fully replicate the human condition
- Human eyes adjust focus through lens shape changes, which may interfere with the signals
- The manufacturing of smart contact lenses is currently expensive and not commercially viable
The research team plans to:
- Develop a wireless version of the device
- Conduct long-term safety tests
- Progress to human clinical trials