Can vision loss caused by damage to the optic nerve ever be restored? Bernhard Sabel and his team seem to think so, and over the past few years they have been attempting to use repetitive transorbital alternating current stimulation (rtACS) to partially restore vision in patients with optic nerve damage. The noninvasive procedure involves applying biphasic pulses of electrical current (8–25 Hz) through electrodes placed on the skin around the orbital cavity. “This field is popular, but not without controversy,” notes Sabel.