The invention refers to eye technology and in particular a system and method for the characterization of eye fixation. The invention further refers to a system and method for the determination of parameters of eye fixation and saccadic motions. The system and method may be used to diagnose and evaluate reading difficulties for ascertaining how much benefit an individual would derive from an intervention with an expert, i.e. after treatment. A system for subject 10 eye tracking on a projection surface 6 includes: (i) infrared light source 3 to create reflections on the subject's eyes, (ii) two or more cameras 4 for subject's head position tracking, (iii) one or more cameras 4 to track movements of the subject's first eye on the projection surface, (iv) one or more cameras 4 to track movements of the subject's second eye on the projection surface 6, and (v) a processing unit 7 configured so that it tracks the subject's gazes on the projection surface, determines if the subject focuses on a predefined sub-region or sub-regions in the projection surface from the tracking of said gazes and computes the duration of said gazes.