No matter which turn on or off, the most important thing is visual line, I think. People naturaly eager to watch his eyes in talking a critical story, because e

No matter which turn on or off, the most important thing is visual line, I think. People naturaly eager to watch his eyes in talking a critical story, because eyes tell braveness and honest.I mean turning on is preferable if the meeting were big deal, but it is not nessesary in case of oridinary ones.