Be very careful when comparing the ANSI ratings of different lenses and glasses. There are multiple ANSI ratings that cover a wide range of lens and sunglass features.
In particular, the Z80.3 standard that DO claims that their lenses meet is a standard that applies only to sunglass lenses (not to the sunglasses as a whole). The standard mainly covers light transmission and color distortion, but it does include the "drop ball" test. Again, the standard applies only to the lenses.
The Z87.1 standard considers the frames and lenses as a complete system, and tests the two together. Eye protection is emphasized in the Z87.1 standard: the glasses must past not only the "drop ball" test, but also a high-mass impact test, a spike penetration test, and a projectile test. In workplaces that require eye protection, Z87.1 certification is usually required for eyewear.
See my last post. Also, from what I read on policeone.com, the z80.3 rating doesn't include any form of impact testing, but this list could be outdated or incomplete.