Gaze Metric	Definition
Fixation duration	The total duration in milliseconds of an identified fixation from the first sample to the last sample included in the fixation definition. Fixation was defined as at least 66ms of gaze samples within a 100-pixel dispersion area. The total fixation duration was determined by summing the fixation duration for all identified fixations within an area-of-interest.
Fixation count	A count of all fixations detected within an area-of-interest.
Glance count	The number of times gaze entered and left an area-of-interest. Gaze to the area of interest was defined by at least one identified fixation.
Time-to-first-fixation	The time elapsed from the start of the temporal area-of-interest to the first sample of the first identified fixation within an area-of-interest.