I have been having this very strange problem when viewing geometry through a perspective camera in the viewport. It doesn't matter what kind of shading I apply and it doesn't happen with the orthographic camera or when I just navigate around normally. The geometry looks almost transparent and the edges have this weird jagged quality.
I am using Blender 3.2 on Windows 10. Graphics card is Nvidia GTX 1060 Max Q design. Any idea what might be going on?

I expect some of this comes from my old graphics card as I don't have this issue on my newer computer.
– Duncan Jun 30 '22 at 06:47