It appears to reflect overhead light by virtue of being white and slightly angled - wow, science. I guess albinos won't be too concerned about this technology.
"A 2012 version, powered by a lithium-ion battery, included LED lights around the nose that shined near-infrared light toward cameras. Computer-vision systems were also fooled by the bright light, but the visor looked dorky and required a bulky power source."
So the new one is the same, just no leds or power source. Dorkiness has been maintained...
All this so the cameras don't think you have a face. They still record you, and can tell you are a person by the way you move. And since you will be the only douchedork wearing these around, you should be easy to find.