Transcutaneous Auricular Vagus Nerve Stimulation in Dry Eye

"taVNS device (Elmmedicare, EC100, Shenzhen, China) was used to apply stimulation for patients.~Stimulation parameters comprised an electrical current of 1 mA at a frequency of 20 Hz, with a waveform width of 1 ms. Repurposed off-the-shelf devices were utilized for this purpose, with the stimulator generating single square-wave pulses lasting 1 ms each. Enhancing conductivity was achieved by wiping the ear with tap water. The electrodes were placed on the cymba conchae and concha around the affected ear, which is the region of rich vagus nerve branch distribution."

Participants received 0.1% sodium hyaluronate eye drop (HYLO COMOD® eye drops, Ursapharm, Ltd., Germany).