I have yet to see a PIAA district 9 team mark a single player's name in the scorebook with a "C." Certainly one or more student-athletes I have refereed by now must have been wearing contact lenses. Nor have I heard mention of such a requirement at any of our chapter meetings. It's got to be some sort of local thing to your area.
Also, I wear contact lenses. When I sign the book, should I put a "C" by my name?