Research developed in South Korea indicates that a contact lens equipped with microelectrodes can stimulate brain areas related to mood and memory, paving the way for an alternative treatment to traditional antidepressants
For decades, the treatment of depression has revolved around two main fronts: the continuous use of antidepressant medications or the direct stimulation of nerve cells in the brain, often through invasive procedures. Now, however, a group of South Korean researchers has presented an alternative that sounds almost futuristic but has already produced concrete results in the laboratory: a contact lens capable of acting directly on the brain circuits responsible for mood.
The research was conducted in South Korea and the results were detailed by journalist Kim Suh-young from the broadcaster Arirang News. At first glance, the device is indistinguishable from a common contact lens. However, a closer analysis reveals a sophisticated structure: a tiny antenna and embedded microelectrodes, both made with highly flexible materials. This feature is crucial as it ensures that the lens does not block or interfere with the user’s vision.
How the lens transforms electrical signals into brain stimulation
The operation of the technology is what impresses specialists the most. Two high-frequency electrical currents, emitted by the lens, meet inside the eye and convert into a low-frequency current upon reaching the retina. It is at this point that the process becomes therapeutic: this low-frequency current sends an electrical signal through the optic nerve network, reaching to stimulate the hippocampus and the prefrontal cortex — two brain regions widely associated with emotional control and, consequently, the treatment of depression.
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According to the researchers themselves, the safety of the procedure was one of the study’s priorities. “These electrical signals are safe for the eyes. They stimulate only the retina and we believe they do not cause pain,” stated one of the scientists involved in the project. This finding is especially relevant, as any technology applied directly to the human eye needs to prove the absence of risks before advancing to later testing phases.
Results in rats surprise team of scientists
To validate the effectiveness of the lens, the team conducted experiments with rats diagnosed with depressive conditions. The animals used the device for 30 minutes daily, over three consecutive weeks. At the end of the period, the researchers found that the depressive symptoms had disappeared and the activity levels of the rodents had fully recovered.
More than that, the study identified concrete biological changes. The synapses of the neural network, which had weakened due to depression, became strong again. At the same time, the levels of brain nerve growth factor increased, while inflammation indices showed a significant decrease. In practice, the observed effect was comparable to that provided by traditional antidepressant medications — however, without the use of drugs.
Artificial intelligence confirms reversal of depressive condition
To reinforce the analysis of the results, the scientists resorted to machine learning. The tool cross-referenced the behavioral and biological patterns of the treated rats with those of two reference groups: healthy animals and untreated depressed animals. “Machine learning showed that the treated rats no longer resembled the depressed group. Instead, their patterns were much closer to those of normal rats,” highlighted the team responsible for the study.
In light of these findings, the researchers classify the results as promising and are already planning the next steps. According to the report released by the Arirang News portal, the group intends to start clinical trials in humans within a period of up to three years, provided the next stages of pre-clinical validation continue to advance as expected.
If confirmed in humans, the technology could represent a significant change in how depression is treated globally, offering a non-invasive and potentially more accessible alternative to the millions of people living with the disorder worldwide.
Source: Cell Press
