Hello, I am 18 and I have been doing contact sports for an year now (kickboxing, karate and MMA). I have recently heard from a relative who once worked in the eye care industry that I am not allowed to do such a sport (or anything that requires you to receive blows to the head) because i have a -4 dioptry. Is that true? I do this sport on a semi-competitional level, where i have a contest once or twice a year,