Iris Shaders recently updated to 1.7.0, introducing shader compatibility with Distant Horizons 2.1, a mod that adds LODs, or levels-of-detail rendering, to Minecraft. It would be a fun surprise to see DH compatibility added to Super Duper Vanilla shaders, but as of now, attempting to use it with DH results in the LODs being completely invisible.

Hello, while it is being planned, I am currently very busy with schoolwork and limited specs for using the mod unfortunately. I will however keep this post open until it is finally implemented.