How to use the laser pointer effectively?

In the case of flickering, the eye is a very tired person looking for high visibility, such as a green laser pointer. Since the human eye is very sensitive to moving things, not image files or text that needs to be seen, the mind will switch to the track By itself, irradiate with a laser pointer. Because you are not nervous at all, the motion of the presenter on the screen will become very large, and the screen will become very large or even a little shaky. Some speakers have been talking to it inside. Because it will always follow the trajectory of strenuous exercise, it will be eliminated if you concentrate on speaking, and people who have seen it will be tired and eyes will continue to be tired. Probably no one can gesture and there is a risk of starting and continuing, causing lasers to appear in the eyes of others.