I was in a group a while ago and we did something called 'soul gazing'. We positioned ourselves in such a way that we were looking into the other person's right eye... and then we changed until we had each connected to every other person (8 of us, I believe). It was an interesting experience... to say the least.
The purpose of the pupil... to get larger and allow more light in, to get smaller and keep more light out... restricting the flow of light. Women used to use Bella Donna to increase the size of their pupils for aesthetic purposes.... so, there is something to being taken by someone with larger pupils. Not sure why though