System for assessing target visibility and trackability from eye movements

A system for dynamically assessing a visual function of a subject, comprising:

• i) a visual display;
• ii) an eye-tracking device configured to detect a gaze position of at least one eye of the subject;
• iii) one or more processors operably connected to the visual display and the eye-tracking device;
• iv) a non-transitory memory operably connected to the one or more processors and including machine executable code that when executed by the one or more processors performs the steps of:
• a) presenting for a first defined amount of time a first stimulus at a first location on the visual display;
• b) storing first stimulus information associated with the first stimulus, the first stimulus information including:
• i. first stimulus location information associated with a location of the first stimulus on the visual display for the first predetermined amount of time;
• and
• ii. first stimulus time stamp information associated with the first stimulus location information;
• c) receiving in real time, from the eye-tracking device, for the predetermined amount of time, first tracking data comprising:
• i. first gaze point information associated with a first point on the visual display to which the eye is directed during the predetermined amount of time;
• ii. first position information associated with a 3D position of the eye over the predetermined amount of time;
• and
• iii. first gaze point time stamp information associated with the gaze point information and the position information;
• d) storing the first tracking data in the non-transitory memory associated with the first stimulus;
• e) determining, for the first stimulus, a dynamic evidence-of-visibility score and a dynamic evidence-of-trackability score based at least on the tracking data and the first stimulus information;
• f) storing in the non-transitory memory, associated with the first stimulus:
• i. the dynamic evidence-of-visibility score;
• and
• ii. the dynamic evidence-of-trackability score;
• g) analyzing the stored first tracking data to determine a presence of one or more of:
• i. fixation eye movement(s);
• ii. saccade eye movement(s);
• iii. smooth pursuit eye movement(s);
• and
• iv. blink(s);
• h) analyzing the first tracking data obtained via the eye-tracking device to identify for the eye, relative to the first stimulus:
• i. position-matched tracking eye movements;
• ii. trajectory-matched tracking eye movements;
• and
• iii. saccade-based tracking eye movements;
• i) updating, in real time, the dynamic evidence-of-visibility score and/or the evidence-of-trackability score associated with the first stimulus based on at least one of any eye movements detected in step g) and step h);
• and
• j) updating in real time the appearance of the first stimulus to provide a second stimulus based on at least one of the updated evidence-of-visibility score and the updated evidence-of-trackability score for the first visual stimulus.