E T V I S I O N M A N U A L
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By computing the point at which the lines of gaze from the two eyes converge, the gaze point can
represented as spot on the scene camera image.
Since the geometry of the eye structures and the position of the optics with respect to the face vary
somewhat from person to person, gaze computation accuracy can be improved by incorporating data
from calibration points (points at which the person wearing the optics is known to be fixating a
particular point on the scene camera image). Excellent accuracy is often achieved with a single
calibration point, but can sometimes be improved with additional points.
