Athletics has been contested at every Summer Paralympics since the first games in 1960. Men and women from all disability groups compete in the sport. Some athletes use wheelchairs or prosthetic limbs and compete in their respective sport independently and under their own power. Visually impaired athletes participate in running events with the help of a sighted guide, to whom they may be attached by a tether. Sound-emitting devices or a sighted "caller" are used to indicate target areas for throwing events, take-off points for jumping events, and other important locations for visually impaired competitors. There are several different classifications and groups in which athletes compete that are based on their disability. Each disability has a different classification which determines the class the athletes will compete in. Nearly every opportunity that is available to non-disabled athletes is available in the Paralympics. In the first edition of the Summer Paralympic Games in 1960, Ita…[Wikipedia]