item with vision radius

[MessAvatar]

for my map, I'm trying to create an item that gives a +50 radius to vision. can anyone tell me how I would be able to do this?

 

[Los_Tacos]

There's an item that adds to sight range during the night, not sure what it's called, see if you can edit that to work in the day too.

 

[N00byStance]

Ultravision?