Laser laser machine have a harm to human body?

Laser laser machine have a harm to human body? Laser laser machine mainly to the harm of human body in our glasses. If there is no laser protective glasses, you try to avoid to see the laser directly, because in the long run to eyes hurt a lot. When the laser processing strictly need laser protective glasses and dust mask. Laser laser machine currently found no other harm to human body, so when operating the laser laser machine, be sure to bring the laser protective glasses, do not see the laser directly.