  Eye gaze controlled interfaces allow us to directly manipulate a graphical
user interface just by looking at it. This technology has great potential in
military aviation, in particular, operating different displays in situations
where pilots hands are occupied with flying the aircraft. This paper reports
studies on analyzing accuracy of eye gaze controlled interface inside aircraft
undertaking representative flying missions. We reported that pilots can
undertake representative pointing and selection tasks at less than 2 secs on
average. Further, we evaluated the accuracy of eye gaze tracking glass under
various G-conditions and analyzed its failure modes. We observed that the
accuracy of an eye tracker is less than 5 degree of visual angle up to +3G,
although it is less accurate at minus 1G and plus 5G. We observed that eye
tracker may fail to track under higher external illumination. We also infer
that an eye tracker to be used in military aviation need to have larger
vertical field of view than the present available systems. We used this
analysis to develop eye gaze trackers for Multi-Functional displays and Head
Mounted Display System. We obtained significant reduction in pointing and
selection times using our proposed HMDS system compared to traditional TDS.
