"AES" wrote in message news:siegman-B29138.
"Happy Dog" wrote:

"AES" wrote in message

All of these effects can be produced at light intensities way, way
below
the level that produces any permanent damage to the retina. Though I'm
no expert on this subject, I have also been told that sustained
exposure
to this kind of illumination in a situation where you can't just "turn
it off" and where the light levels, although below permanent damage,
are
well above what leads to you to blink, and especially if they occur in
stressful situations with demanding performance requirements, can
rapidly lead to various kinds of psychological distress.

If you in turn have evidence to contradict this, or to demonstrate that
I've made errors in this particular sentence, I'd be glad to hear it,
and I suspect others on this NG might be interested also.

Not to contradict it, since the term "psychological distress" is impossibly
vague. It was that phrase that made me wonder what kind of "expert"
muttered it.

moo