Transcorneal electrical stimulation

Transcorneal electrical stimulation (TES) is a therapy developed for use in patients with a variety of eye diseases. The procedure involves placing electrodes in the form of contact lenses upon the patient's corneas, with a reference electrode on the skin near each eye. A weak current is delivered through the electrodes, with the intent of stimulating the visual system and enhancing its activity.^{[citation needed]}

As of 2022, the technique was still in the early stages of research in human patients. A review of literature published in 2020 estimated this therapy as "probably effective" in the treatment of retinitis pigmentosa, based on the evidence available at the time.^[1]