🚀 go-pugleaf

>> 
>> Wouldn't it be just as distracting changing focus from about 4 cm. 
>> (face shield ) to tens of meters ( road conditions ) as it would be to
>> look down at your tank bag?

> Why have to look 4 cm from your eyes?  It should be possible to have the
> display appear to be about 20 meters in front of you, although the type 
> would have to be large.  I think there is a device that will pinpoint 
> where a person's attention is focused, psych labs use that sort of thing
> all the time.  How difficult would it be to vary the focus and apparent

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> Daniel Weigert                                        USA 

From what I remember of my experiences in school, I believe the device you
are referring to locates the direction the eyes are pointing, not the distance
to which they are focused. In a physiology lab I was in, we did some visual
perception experiments that used an infrared emitter that was aimed at the
boundary between the iris and the sclera (the colored and white parts of the
eye. The amount of IR reflected varys between these two portions of the eye,
and by detecting an increase or decrease in response, a detector is able to
tell which direction the eye moves. Extending this to more than one direction
is possible with more than one emitter/detector pair.

Getting this to be auto-adjustable for a helmet seems to be a real pain. The
setup we used required a fair amount of adjusting and was easily knocked out
of alignment. 

Les Szepesi