Malcolm Stewart wrote:

NOT true.
Back in 1963, I suffered temporary blindness from one of the early HeNe lasers
shining mode patterns onto the slightly reflective skin on the back of my hand -
and this was before manufacturers had managed to get the power of these lasers
up to the 1mW level. ( We were lucky to get 1/10 mW in those days.)

Are you saying you got "temporary blindness" just looking at the
reflection of a sub-mW hene off your skin? I think not.

--
Grunff