Table 3.

Comparison of geometric models (parameter-free physical measurements vs. optimized parameters) for near, medium, and far layouts. All values are distances in mm. C_x, C_y, C_z are the coordinates of the camera; S_x, S_y, S_z are the coordinates of the upper left-hand corner of the screen (cf. Fig. 3). An asterisk indicates the parameter was fixed to the physical layout measurement

Model Parameters	Near	Medium	Far
Camera-to-pupil, Cx
Physical	92	92	92
Optimized	130	165	183
Camera-to-pupil, Cy
Physical	−310	−310	−310
Optimized	−215	−239	−230
Camera-to-pupil, Cz
Physical	495	525	625
Optimized	495*	525*	625*
Screen-NW-corner, Sx
Physical	−163	−163	−163
Optimized	−142	−87	−76
Screen-NW-corner, Sy
Physical	58	58	58
Optimized	206	140	156
Screen-NW-corner, Sz
Physical	740	835	935
Optimized	736	851	937