FRESNO, Calif. - An experimental device that uses the tongue instead of the eyes to "see" could be on the market next year, and a blind Fresno, Calif., teen hopes to be among the first to take one home.
Researchers say their BrainPort device does not replace the sense of sight, but lets the blind perceive images, making it easier for them to get around.
One group they foresee benefiting: troops returning from Iraq and Afghanistan who are blind from brain injuries.
BrainPort consists of a tiny digital camera mounted on sunglasses. The camera is attached by a wire to a unit about the size of an iPhone, and the unit connects to a small electrode panel that sits on the tongue. The tongue receives electrical pulses - like popping champagne bubbles.
The sensations on the tongue create patterns that users learn to perceive as images. The strongest electrical pulses are perceived as white areas and the weaker ones as gray. There is no sensation for black areas.
The blind process the tactile information in the brain's visual cortex, researchers say. Those who could see before they went blind describe the sensations as similar to vision - although the resolution is not the same. Those who have never had sight say they are better able to form mental pictures of objects.
Katie Schick, a 17-year-old high school junior, can't wait to try it. She began losing her sight shortly after birth and lost all vision within a couple of years.
"I could possibly go on the Internet with it," she said. "I'd like to be able to go on the computer by myself at home without my mother and father with me."
Wicab Inc., the Wisconsin company that is developing BrainPort, could ask the federal government for permission to market it within the next few weeks, said Robert Beckham, the chief executive officer.
BrainPort researchers say the idea behind the technology is fairly simple. People "see" with their brains - not their eyes. And the brain can make visual sense out of stimulation received from parts of the body other than the eye.
"Instead of the main nerve from the eye, we're using the nervous system through the tongue," Beckham said.
The brain is pliable, he said. "It doesn't say we can't use the information because it came from the tongue."
After 10 hours wearing BrainPort, people can find and walk down a hallway and avoid obstacles, said Aimee Arnoldussen, a Wisconsin neuroscientist who is leading Wicab's research. With the device, people also have distinguished a men's room sign from a women's room sign and found doorways, she said.
The potential for the device to help blind soldiers returning from the wars in Iraq and Afghanistan intrigued Gale Pollock, who was surgeon general of the Army medical department in 2007.
She enlisted the help of an Army officer and a Marine corporal to assess the device before she retired. Pollock said the servicemen's response was: "Ma'am, this works. It's new. We don't think it's as far as it can go, but can you get it for us?"
Pollock, now retired from the military, is executive director of the Louis J. Fox Center for Vision Restoration in Pittsburgh, where BrainPort research is ongoing.
BrainPort was invented by the late Paul Bach-y-Rita, a Wisconsin neuroscientist, who conceived of the technology in the 1960s and founded Wicab in 1998, said Wicab CEO Beckham.
The National Eye Institute, part of the National Institutes of Health, has funded BrainPort research for years, said Michael Oberdorfer, director of the agency's visual neuroscience program. "It's an interesting and promising area of research," he said.
BrainPort can't restore vision for people who have lost it. Katie, for example, has had both eyes removed to alleviate pain. She wears artificial eyes.
"You don't put the device on and magically see," Arnoldussen said. And BrainPort isn't a substitute for a cane or a guide dog - it's another tool to help someone know his or her surroundings and safely navigate them, she said.
But while researchers focus on safety and mobility applications for the device, already some BrainPort test subjects have pushed the boundaries. One man climbed an indoor rock wall wearing the device, Arnoldussen said. Another shot a ball into a wastepaper basket.