G'morning David, 

 DW> Many years ago, I fantasy-invented various devices that would use
 DW> *very* fast photochromic glasses. For example, I thought of a foglamp
 DW> that would emit a very rapid stream of very brief pulses of light. The
 DW> user would wear glasses that would be darkened just as each pulse of
 DW> light was emitted, and would then become clear, over a time of the
 DW> order of a few microseconds, as the pulse travelled away. The result
 DW> would be that the back-scatter in the fog, right in front of the lamp,
 DW> would be blocked from the user's eyes, but the fainter light coming
 DW> back after being reflected from fairly distant objects would be allowed
 DW> through.

I like it...

 DW> I am sure that this would work, as would several other things I dreamed
 DW> up, *if* there were lenses that would darken and clear fast enough.

Err, I'm far from up-to-date in these fields,  but isn't there 
some sort of fast-switching polaroid that'd be worth trying ?

:-)
 
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