Blind archers use camera tripods equipped with homemade tactile sighting devices. To direct their shot at the target, they place their bow hand against a pin or metal bar that has been positioned by a sighted spotter.
A tiny sound emitter inside the ball produces a constant high-pitched tone to indicate its location. A second device on the backboard emits a lower-pitched, intermittent beep that tells players where to aim their jump shot.
Using rifles with laser sights and photoelectric cells, competitive shooters aim at a black, white, and gray target. The sensor triggers different tones as the laser beam passes over each shade, indicating when to pull the trigger.
Players swing a shortened racket at a Nerf-like ball with a rattle inside. They navigate via thick string taped to the floor of the badminton-sized court. The number of bounces allowed (up to three) depends on the degree of blindness.
(Who says chess isn’t a sport?) Black and white squares are set at different heights, and black game pieces are marked with pins. Players learn to feel the difference between, say, a bishop and a rook.
Bowlers use side railings to get lined up, but beyond that everything else is the same. Twelve legally blind US bowlers have scored perfect games; the record for a completely blind person is 263.