increasing its absorption of the blue light and casting a visible shadow in the shape of the green laser. This shadow met all criteria: it was visible to the naked eye, matched the laser’s ...

It met all the criteria for a shadow because it was visible to the naked eye ... of the blue illuminating laser beam, ...

If you’ve ever suffered from dry, irritated eyes or struggled to fall asleep after a long day of staring at your computer, you may have been tempted to purchase a pair of blue-light-blocking ...