According to a study published in the journal Current Biology, the eyes might betray us if we wait for revealing our cards to opponents.

During the experiment at the University of Melbourne, Australia, 12 men was asked to list 40 numbers between 1 and 30 was calculated as the response time, the choice of numbers was random. Measuring eye position both vertically and horizontally during the 500 milliseconds before the number was given, the researchers were able to know the number that would have given later. Movomento an eye toward the lower left means that the next number is lower but with a shift to the right and up the opposite.

Dr. Tobias Loetscher, author of the study, said that this is a silly but simple truth so if you play poker you are careful, you never know if you play against professionals who are able to read your eyes. A tip is to buy a pair of glasses as Greg ‘The Fossylman’ Raymer!