Yeah I believe there is a reflector law, though I dont know how enforced it would be.
Ive never heard of anyone getting a ticket for not having them, but I guess you never know.
And if you are concerned about visibility then maybe its best not to get them.
http://codes.ohio.gov/oac/4501-15
With that said though, Im likely getting them next year.
But I also dont have a front plate, so im obviously a rebel! lol