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.