Capitalizing on Vision Denial (Nocturne, Graves)

I was thinking about this fairly undervalued mechanic in League - the ability to cut down map vision to a shortened sight radius around the affected player(s). When I play or am allied with one of the two characters with this mechanic (Nocturne and Graves), it is very hard to actually capitalize on the advantages that this vision denial gives because there is no feedback for the team with this advantage that clarifies the shortened vision range.

I believe for both skills (Paranoia and Smoke Screen), the reduced vision range is 675 units, but this is difficult to visualize at a glance and players not familiar with these champions probably won't know that.

What I suggest is that champions affected by the vision denial debuff have a feedback circle, similar to Kha'Zix's Isolation indicator, that clarifies their sight radius to both allies and enemies so teams with this advantage can make tactical plays such as flanking ambushes and skirting in and out of the vision range, and teammates allied with the debuffed player (who have vision of them!) know what they can and can't see.