The study examines the 8 football referees´ visual behavior during the perception of offside actions carried out in a laboratory setting. The task consists on perceiving a rally of 24 trials onto a large screen (5x3m) with reduced play situations and that could conclude with an offside action. Participants perceive the sequence with the ASL Eye Tracking SE5000 and press a laser pointer toward the screen in those trials with offside action. Variables to manipulate are the distance and angle in which the offside trials are perceived. The dependent variables are the number and time (average) of visual fixations and the success rate. The results show that the distance and angle changes the referees´ visual behavior. Moreover, they have higher success rate when they perceive trials with small angles, concretely with short and medium distances.