What is ohios law for a black belt using self defense?

well i just wanted to know because i hear so many stuff that isnt the same. like you got to let the person hit you 3 times before you can defend your self or if you feel that your threatened you can act. i just want to know because i hear ohio has no self defense laws and being a black blet your a weapon you could go to prison for 5 years. i just want to know whats right.|||www.judoinfo.com , www.uslegal.com , www.stenudd.com/aikido, www.statetroopersdirectory.com/