Drug-resistant depression is one of the greatest challenges of today’s medicinesince when antidepressants they don’t workpsychiatry and neurology have to resort to therapies such as electroconvulsion. Now, a team of researchers has given this issue a radical turn by developing smart contact lenses capable of treating depression by stimulating the brain through the retina.
a study published in the magazine cell shows very good results in mouse models with the use of these contact lenses which have made it possible to reverse the depressive phenotype with a capacity comparable to that of the antidepressant fluoxetine, or better known as Prozac.
It is not invasive. To understand the milestone that this study represents, we must first look at the current therapies that involve using what is known as Transcranial Magnetic Stimulation to be able to do non-invasive neuromodulation for patients with drug-resistant depression. The possibility of transcranial electrical stimulation by direct current is also being studied.
But the problem with these therapies, which are at the bottom of psychiatry, is that reaching the deep regions of the brain without resorting to surgery is extremely difficult. And one of the risks of applying a strong electric field from the outside to reach the depths of the brain can end up damaging part of the brain.
The solution. This physical inconvenience is where temporal interference technology comes in. As detailed a review done in 2025this stimulation is a great strategy, since it consists of applying two high-frequency electrical currents that do not affect the superficial brain tissue.
In this way, when crossing in the deep areas of the brain, the frequency difference creates a new low-frequency wave that does stimulate the target neurons. It is a functional concept that was demonstrated for the first time in mice and that allows access to the depths of our anatomy without a scalpel.
Some contact lenses. Under this principle is where we are now looking for a way to apply it in a way that is comfortable for the patient and is where the use of contact lenses equipped with electrodes made with gallium and platinum oxide comes into play. Here the direct anatomical connection that exists between the eye and the brain through the optic nerve is used to transmit this stimulation through the retina which allows temporary interference signals to be sent to the neural networks involved in depression.
The application. In the research, this stimulation was simply applied for 30 minutes a day for three weeks in the rodents. What was achieved here is a restoration of healthy brain oscillations and a behavioral improvement that, according to the researchers, is comparable to that obtained by administering fluoxetine in these same animal models.
Caution. Here we must keep in mind that this is the first time that contact lenses have been used to treat a brain disorder, and although the design of the device is a display of engineering, we must be cautious. As is often the case with these advances, the transition from the laboratory to the patient is very slow due to the need for numerous trials to assess the effect and safety in humans. But the idea is already on the table right now and we just have to wait for science to continue advancing.
Images | rawpixel.com on Magnific
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