▁degree ▁of ▁physical ▁or ▁visual ▁dis ability ▁and ▁handled ▁at ▁the ▁international ▁level ▁by ▁the ▁F E I . ▁ ▁The ▁sport ▁has ▁el ig ible ▁class ifications ▁for ▁people ▁with ▁physical ▁and ▁vision ▁dis abilities . ▁▁ ▁Gr oups ▁of ▁el ig ible ▁rid ers ▁include ▁The ▁sport ▁is ▁open ▁to ▁compet itors ▁with ▁imp a ired ▁mus cle ▁power , ▁ath et osis , ▁imp a ired ▁pass ive ▁range ▁of ▁movement , ▁hyper ton ia , ▁lim b ▁def ic iency , ▁at ax ia , ▁leg ▁length ▁difference , ▁short ▁stat ure , ▁and ▁vision ▁imp air ment . ▁ ▁They ▁are ▁grouped ▁into ▁five ▁different ▁classes ▁to ▁allow ▁fair ▁competition . ▁ ▁These ▁classes ▁are ▁ ▁Gra de ▁I , ▁Gra de ▁II , ▁Gra de ▁III , ▁Gra de ▁IV ▁and ▁Gra de ▁V . ▁ ▁The ▁para - e quest rian ▁classification ▁does ▁not ▁consider ▁the ▁gender ▁of ▁the ▁r ider , ▁as ▁e quest ri ennes ▁comp ete ▁in ▁mixed ▁gender ▁compet itions . ▁Intern ation ally , ▁classification ▁is ▁handled ▁by ▁F E I . ▁ ▁History ▁ ▁In ▁ 1 9 8 3 , ▁classification ▁for ▁c ere br al ▁p als y ▁compet itors ▁in ▁this ▁sport ▁was ▁done ▁by ▁the ▁C ere br al ▁P als y - Intern ational ▁Sports ▁and ▁Rec re ation ▁Association ▁( CP - IS RA ). ▁ ▁They ▁defined ▁c ere br al ▁p als y ▁as ▁a ▁non - progress ive ▁brain ▁leg ion