Aubert phenomenon

an optical illusion in which a bright vertical line in a dark room tilts to one side when an observer tilts his head to the opposite side.
Found on http://www.encyclo.co.uk/local/21001

Aubert phenomenon

Type: Term Pronunciation: ow′bert Definitions: 1. a phenomenon in which a bright perpendicular line appears to incline to one side when the observer turns the head to the opposite side in a dark room.
Found on http://www.medilexicon.com/medicaldictionary.php?t=67904
No exact match found