and "retinal sensations" when players see "game elements intermittently or episodically in the back of the eyelids"."
And again. Visualizng things with your eyes closed is not what I would call Hallucinating, or something to be alarmed about.
Respondents reported seeing "distorted versions of real world surroundings" and "misinterpreted real life objects" after they had stopped playing. Others said that game menus appear in front of their eyes during conversations.
Some gamers told scientists at Nottingham Trent Universitys International Gaming Research Unit that they see "coloured images" and "heads up displays" while driving on the motorway.
That is much closer to hallucinating, and a cause for concern.
What happens with your eyes closed is trivia. Drive for a few hours on the highway and pull over, close your eyes. I bet you see highway... OMG hallucinating!