G'morning Herman and David,

And thanks for the conversation on glasses.

I used to have a pair of super-duper poloroids in my youth (before 
LCD displays!), but when they were stolen I'd got over their 
status-enhancing benefits and never replaced them.

Worrying now about UV damage is a bit pointless, I guess, but the 
idea of phototropic lenses is intriguing;  I shall enquire of my 
trusty optician of the current capabilities of present-day 
offering (a new series of ads claiming on-demand coffee, fame and 
girls as well as instant protection set off my original mention 
here).

Temperature variation had not occured to me,  much less the UV 
filtering effect of car windows...

A hat with a proper brim might be a better aid.

:-)
 
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