Fig. 1. Flow chart for optimizing light source layout

Fig. 2. Schematic diagram of human eye^[16]

Fig. 3. Elliptic parameters in the XOY plane

Fig. 4. The geometric relationship diagram of glints

Fig. 5. Imaging process of pupil edge

Fig. 6. Optical axis in polar coordinate system

Fig. 7. Schematic diagram of coplanar plane

Fig. 8. Ray tracing for solving the center of the pupil

Fig. 9. Distribution of the test points on the plane

Fig. 10. Distribution of estimated and true values in simulation. (a) The estimated and true values of the gaze vector; (b) The estimated and true values of the POG

Fig. 11. Hardware layout of head mounted devices

Fig. 12. Hardware layout of desktop devices

Fig. 13. Position index of light in head mounted device

Fig. 14. MAE for 42 sets of light source layouts (head mounted)

Fig. 15. Position index of light in desktop device

Fig. 16. MAE for 64 sets of light source layouts (desktop)