Safety glasses dedicatd to lasers are mandatory to protect the eyes from laser beams. These glasses have been selected to cut the most dangerous wavelengths used for laser shows, while maintaining a good visibility.
These glasses have and optical density (OD) of 7+ between 190nm and 540nm et are CE certified. This means that blue and green beams are attenuated to a point they are not dangerous for the eyes (optical power divided by 10 millions). The red remains visible in order to see where the laser beam is.