How do you get insane amounts of vision? I'm seeing over 100 sometimes.

Vision score is calculated by your wards placed and wards cleared so using sweepers, control wards, duskblade, and vision plants are great ways to increase it.

Even over 200. I scored 206 in a 60m match once. Not as support, but as Jungler.

But, yeah, you got it. The level 9 ward + control wards.

Try to not hold onto wards. Keep a CW on the map for as much of the match as possible. Swap to Farsight level 9. (In practice this tends to multiply VS values in long matches.) Hit the scryers every time. if your jungler won't/can't take the scuttler, then take it.

Buy a ZZ'rot portal and keep it deployed. (Of course, you'll stick it in a bush...) The thing is a giant ward that spawns little moving wards.

You can get extra points for deep placements (because wards that spot enemies in otherwise unlit areas give more points) OR less strategic placements that won't be discovered (in the sense that the ward will tend to maximize points in the VS game; not saying that this is a good idea in general).

You're running Domination? So take Ingenious Hunter which is a bit broken with Farsight. (You can also have two ZZ'rot out at once with this mastery.)

My highest vision score is 202 at 50ish minss I was playing pyke with ward item, red trinket, duskblade, and the rune zombie ward.

Here's how you can measure Vision Score

Using control wards and sweeper to clear vision and always using your wards.

My highest was 103 in 42 mins.

Also take Zombie Ward

Thank you all for the tips. I do take sweeper, but haven't noticed that it adds to vision score other than a single time use.