at the
1996 Summer Paralympics in
Atlanta,
USA. Swimmers are classified according to the type and extent of their disability. The classification system allows swimmers to compete against others with a similar level of ability. Swimmers with physical disabilities are allocated a category between 1 and 10, with 1 corresponding to the most severe types of disability.
Physical disabilities of para swimmers include single or multiple limb loss (through
birth defects and/or
amputation),
cerebral palsy,
spinal cord injuries (leading to paralysis or disability in limb coordination),
dwarfism, and disabilities which impair the use of joints. Blind and visually impaired swimmers compete within separate categories, being allocated to categories 11, 12 or 13. Category 11 corresponds to totally blind swimmers, while competitors in category 12 have severe but not total visual impairment. Swimmers with mental disabilities compete in category 14, Numbers are combined with a letter prefix depending on the event type. An "S" prefix corresponds to
freestyle,
backstroke and
butterfly, while "SB" corresponds to
breaststroke and "SM" to the
medley. Hence, a swimmer with severe physical disabilities competing in backstroke may compete in an S3 event, while a blind swimmer in the medley would compete in class SM11. ==Events==