What is causing these lines to grow as they approach the horizon?

Hi! Apologies if this is a very beginner question - I’ve done some searching but I’m not really sure what I’m looking for so haven’t been very successful.

I’ve created a basic scene consisting of a grid of 1x1 quads with a 128x128px texture that has a white background and a solid grey line around the outside. However I’m seeing the lines grow in thickness as they get further from the camera.

Can anybody help me figure out what is causing this artefacting and how I can get rid of it? Is it related to mip-mapping perhaps? Or maybe anti-aliasing?

Happy to share any project info if required, I’m just not sure what else would be helpful at this point.

Thanks!

Resolved, I just had to disable mip maps