What does ANSI Z87.1 actually mean on safety glasses?

ANSI Z87.1 is the U.S. standard for impact-rated eye protection, and a 'Z87+' marking indicates high-velocity impact certification. Across the reviewers we read, the strong recurring message is that only Z87-marked glasses count as real protection; fashion sunglasses and uncertified lenses performed far worse in informal impact comparisons. Every pick in this roundup carries a Z87 rating.