I am thinking of buying a laser pointer. i am thinking of getting the "GX" 500mW - 750mW Green Laser System. "GX" 500mW - 750mW Green Laser System - BigLasers.com. I am interested in using it with mirrors. I have been watching youtube videos of people doing this. I have noticed that none of the people are wearing eye protection. do you need to wear eye protection at all times when the laser is on? Are these lasers safe to touch ?