Here's my $.005
Tinted face shields are good. If you know for a fact that you will be back before dark
Or you're carrying your clear face shield.
When I got my latest Shoei I went with the High Def Orange.
It's great for overcast or hazy days
Orange and yellow lens cut out part of the blue light part of the color spectrum
When it's foggy the blue part of the spectrum is increased.
Once you get used to the color they work pretty well.
Some people claim that yellow lens help you to see better at night.
I personally don't think so.
There is some talk that wearing sunglasses inside a helmet during a crash can lead to problems with how the helmet transfers energy during a crash.
Me I wear sunglasses during the day and clear safety glasses at night
I ride often with my face shield up and I need to protect my eyes.
As for sunglasses
Make sure they are impact resistant.
And I would strongly recommend not using polarizing lens
One you will see chromatic aberrations in your face-shield of your helmet and if you have a windscreen you will have the same thing there.
On top of that you will misread reflections of shiny road surfaces
While might possibly lead to you not seeing a patch of oil.