Bought clear prescription sunglasses (wrap around), transition lenses (clear at night or inside, and some darkening during day) with anti glare and scratch resistance protection. Put a secure strap and "take a look" mirror. Both the mirror and the glasses are protected from the rain with a fast drying nylon baseball type hat (found in fishing stores) used under the helmet. This I found to be the most effective way to deal with the droplets on the glasses, without obstructing visibility.

As a side note. If there is standing water on the road, I wear an earplug on the left ear to prevent street water from entering my ear from the spray of passing cars.

Double O