@arneme the colour we see in plexiglass is the wavelengths that are not blocked, so yes, colour does matter. If blue light was blocked we would not see it as blue, it would be red or green, possibly yellow (all depending how much blue or other colours was blocked). Before bringing this up I tested it with red, green and blue laser pointers.
For example, power the laser to 1% like you were focussing it, place the lid under the beam, but off the surface, how much of the laser is blocked? In a sense, this shield is worse than nothing because people think it works, where they would probably use the glasses if they did not have the shield in place. Note the glasses provided are a dark green (things appear green through them), and do block a decent amount of blue light.