Is there a way to set the the beginning of the range for certain effects such as dynamic lights or AO ?

I’m working on a project using an “isometric camera” . Not really Isometric, just a camera with a low enough field of view placed far away. Now: this is my setup:

Now the problem is that the engine presupposes that the developer would like everything to begin from the camera origin point. This results in more quality for closeup meshes and less for far away meshes.

In my case though, the first mesh is located quite far away from the camera and when this effects reach the quality is already quite degraded.

Is there a way to clip the unused space and allocate more quality to a specific range ? Thank you for your time !