FREMONT, Calif. -- Learning how to play tennis is hard enough. Now try it when you can't see.
That's what students are doing at the California School for the Blind. They're learning a form of tennis adapted for the visually impaired -- and expanding the boundaries of what the blind can do.
The state-supported campus in Fremont is one of three American schools for the blind that recently began teaching adapted tennis, which was invented in Japan in the 1980s. A nonprofit group called Tennis Serves is working to promote the sport throughout the U.S.
"I didn't know someone with no vision could play tennis until I came to this school," said a 16-year-old student from Modesto named Jonathan. The school declined to provide his last name, citing a state law that protects the privacy of students with disabilities.
Blind tennis features a smaller court, lower net and junior tennis rackets with bigger heads and shorter handles. String is taped to the floor so players can feel the boundaries with their feet.
Players use a foam ball filled with metal beads that rattle on impact, allowing them to locate the ball when it hits the ground or racket. Once served, they have to return the ball before it bounces three times.
"The most difficult thing to teach is timing their stroke," said Sejal Vallabh, the 17-year-old founder of Tennis Serves. "Being able to listen to the ball, locate it using their sense of hearing and swing at the precise moment the ball goes by is really difficult to teach."
While experienced players can keep the ball in bounds and stage extended rallies, just hitting the ball over the net can be a challenge for beginners.
Blind tennis was created in 1984 by Miyoshi Takei, a blind Japanese high school student who designed the adapted ball and helped the sport gain popularity in Japan and other Asian countries. He dominated blind tennis competitions until he was killed in a train accident last year at age 42.
Ms. Vallahb, an avid tennis player who is now a high school senior in Newton, Mass., first encountered blind tennis two years while doing a summer internship in Japan, where her grandmother lives.
"After I saw it there, I knew that I wanted to recreate the sport that I had seen back in the U.S.," she said, so she started Tennis Serves. She is working with engineering students at Harvey Mudd College in Claremont, Calif., to design a ball that continuously beeps to make it easier for blind players to track it.