In flying model airplanes, I sometimes must look into the sun and
immediately be able to see the plane afterwards thus I cannot have my
eyeballs dialating and closing up because in control line precision
aerobatics, all maneuvers are recovered at 5 feet.  In dives this is less
than a tenth of a second for 5 feet thus eyesight is important.  It takes a
couple seconds for eyes to dialate back to normal.  Too late.

We are using the large sunglasses, silver mirrored by Zurichsunglasses.com
or Zurichsunglass.com.  Cannot remember the exact address.  They are
amazing.

For general aviation flying I am using prescription glasses with Brown no 2
tint. These glasses allow me to see steam gauges and glass screens like the
Micro Encoder and Vision Microsystem lcd screens without difficulty.
Polaroid glasses cause difficulty with some of these screens and should not
be used for that reason.

Bob Smiley