Compared to the various high tech sunglass providers, optometrists seem limited in what they can do with prescription lenses.
On my prescription lenses, I use a 30% transmission brown tint as opposed to a neutral grey as it filters out some of the blue.
That allows me to see well when under a cloud and be comfortable in direct sunlight.
Polarising can also block sun glints from other aircraft -- that can be a valuable alert to the presence of another aircraft.