Vision Skills Explained
See Skills Explained for other types of skills.
At base, Vision is a 20m long / 11.25m wide cone in front of an Uma. Vision affects picking an overtake target, along with Debuff Conditions on Skills such as All-Seeing Eyes. Vision Skills can extend or shorten the range of Vision by anywhere from 4m to 18m. The width of the cone is not affected by Vision Skills: Umas can lose sight of targets when their Vision increases as the Vision cone narrows.

Visual demonstration of the effect of increased Vision.
Vision Skills
Buffs:
Studious /
The Bigger Picture - Late Surger - Mid-Race
Strategist - End Closer - Late-Race
[Style] Savvy - Any Style - Start of Race
Debuffs:
Smoke Screen /
Illusionist - Long Races - Late-Race
Disorient /
Dazzling Disorientation - Pace Chaser - Late-Race
The only four vision skills worth considering for competitive use on Debuffers are
[Style] Savvy,
Studious,
The Bigger Picture, and
Strategist.
The current available Vision debuffs are unique to Pace Chasers and Long races, and do not see much use. Vision Debuffs shorten the Vision range of the targets by -3 to -10. This lowers the FoV of the target and impedes overtake target decision making in the late-race. If an Uma is already in Overtake Mode, it can force her out of it after recalculating Vision. If the Uma does overtake, she is more likely to box herself in.