K. Bartl et al., A SIMPLIFIED CALIBRATION METHOD FOR 3-DIMENSIONAL EYE-MOVEMENT RECORDINGS USING SEARCH-COILS, Vision research, 36(7), 1996, pp. 997-1006
An algorithm is presented which allows the calibration of three-dimens
ional eye movements in two magnetic fields with two search-coils in on
e eye, whose relative orientation does not have to be known, Prior to
recordings a calibration cube is placed in front of the eye to measure
real and apparent crosstalk, produced by imprecisely oriented horizon
tal or vertical magnetic fields, and to obtain a first approximation o
f offset voltages, For calibration it suffices if one point is fixated
and, in addition, spontaneous eye movements for 30-60 sec are perform
ed. Additional fixation points can be used to improve the calibration.
Position quaternions are applied for computing eye movement recording
s from man and monkey and to determine Listing's plane.