Stimulating the visual cortex of the brain for 20 minutes with a mild electrical current can improve vision for about two hours—and people with worse vision see the most improvement.
“It’s actually a very simple idea,” says coauthor Geoff Woodman, associate professor of psychology at Vanderbilt University. “This kind of stimulation can improve cognitive processing in other brain areas, so if we stimulate the visual system, could we improve processing? Could we make someone’s vision better—not at the level of the eye, like Lasik or glasses, but directly at the level of the brain?”
