my child was assaulted at school by another child now mine has serious med. condition.do we have any recourse?

My daughter, eleven now & on perm. disability.suffered from eye conditions called 'Accomodating Estropia, Strambismus & Amblyopia(eye's crossed,flipped under eyelids & looses eyesight beginning peripherally until reaching center & goes blind).Under went eye surgery @ childrens hospital to correct & stop disease;it was 100% successful.(med. records proof)Until diff. child @ school w/2yrs of documented violent behavior towards teachers & other students & undergoing intense counseling was allowed to bring to school a "stress ball" as a tool in expressing herself in counseling threw it & hit my daughter in the temple & eyesocket reversing the surgery results(documented in med.record confirmed by original eye surgeon) resulting in new post operative complications due to blow to head symptoms are halo's,double vision,headaches,back in glasses(2 sep. Rx's & on 3rd Rx since May2014),throwing up.School put IEP in place & their own eye Doctor checks her every Friday,also requested sig.to release