Doctors say that hair thinning does not become evident until 50 percent is lost. Does it mean that hair look exactly similar to the naked eye even if 50 percent is lost or does it mean that thinning is not visible until 50 percent is lost. I don't think hair can look exactly similar with 50 percent hair loss because it would lead to a reduction in 50 percent volume so the mane might not look as thick although thinning might not be apparent?thoughts?