Best Eye Cup for EOS R

[herman2992]

I wear glasses.  Often, there is too much glare in my viewfinder for me to see any image at all.  Is there a good third-party over-sized eye cup for the EOS R?  Canon doesn't offer any optional eye cup for the EOS R (according to a company rep this morning).

[Waddizzle]

If you must wear eyeglasses, then that is an issue on almost any camera.  I like to wear a “bucket” hat.  It is one of those hats that fisherman wear.  Baseball caps tend to be too long and stiff.  A fisherman’s bucket hat has a flexible rim.  It is just enough to keep the sun out of your eyes.