So, I'd really like to know what algorithm Riot uses for Vision Score calculations....
I thought for a few days that it was a decent method of keeping track of how good the two supports were (that and assists, mostly). There are, of course, some other factors, but if it seems pretty close in everything else, seeing the Vision Score to compare should at least give one of them an edge in evaluation. I figured Riot would know best how Wards Placed, Wards Destroyed, and Wards Purchased should count toward an overall score.
But I found this. http://imgur.com/a/Ooh40?
Apparently a difference of 4 wards placed and 1 control ward purchased mean literally nothing.
BTW, I generally have a Vision Score of around 60-80; that game was a 4v5 that ended very quickly. Just in case someone was inclined to be toxic. ^.^