SteamVR Vive center distant meshes disappearing from view

Hey guys,

did you ever run into that same issue : using SteamVR for Vive VR headset.
I have a big world with meshes (building, trees,...) far away from the player. When looking straight at them, you can't see them, but when you rotate your head sideways, the distant meshes suddenly appear (in the side of you FOV).
Any idea why ?
Here is a video of it :

(see the trees and white building)

Thanks !