[TN-Bird] Sunglasses for birding?

Does anyone have experience with gray sunglasses for birding?  My regular
glasses are premium progressives (Varilux).  I have never been able to see
birds with my green clip-ons.  I'm considering getting prescription, gray
premium progressive sunglasses.  However, my optometrist suggested/wrote the
prescription for polarized lenses.  When I looked at them today, they were
so dark I feel like I won't be able to see birds with them.  Someone had
told me to get 55% gray lenses, but today, after talking to many places that
make glasses, I learned if I get polarized ones, I have to get 80% gray.  On
top of that, today I verified that my regular glasses have UV protection.
So I'm wondering if I have to get any sunglasses for birding.  Does anyone
have any thoughts on whether polarized sunglasses are worth the money for
birding?
 

Thanks,

Linda Vidosh Zempel

Bartlett, TN



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