.eye1
From WikiManual
.eye1 thru eye9 ----- What am I looking at? Returns a value inversly proportional to my distance from a viewed robot. Each eye views a 10 degree arc. Eye5 looks straight ahead and is the most important eye of all since all reference [[.variables. (or refvars)are calculated from this eye. Eye1 looks to the extreme left. About 45 degrees from the centre Eye9 looks to the extreme right. About 45 degrees from the centre