This depends strongly on the diameter of the dot.Razako said:Don't look at the dot on close walls/brightly colored objects either.
How much the light "hurts" (as in causes perceivable pain) is NOT an indication of danger to one's sight. The "pain" is NOT caused by the laser damaging the retina. The "pain" is caused by your iris closing tightly and the muscles around the eye tensing up. Your eye simply reacts more (tenses up more) to the green light because it can "see" that wavelength better.Zom-B said:This depends strongly on the diameter of the dot.
I have a 50mW green and the dot hurts a lot more more than that of a 275mW red. The dot diameter is 1mm vs. 5mm (factor 25)