Starkvix: This report here has like 10 comments in total most of them are one-liners or even simply "Confirmed" messages. Before posting to any bug tracker it is really recommended to at least skim through the most recent comments to see what the current progress on the bug is. More often than not adding additional comments is not really necessary.
Please adhere to my advice and watch the video I linked. The blurry screen is not a bug. It's a bug that you can reset it by opening the video settings screen. The video will explain in detail where the blurriness comes from and why it will not be reset by just restoring your blood.
TL;DR is: it indicates low health (which is different from blood!) and can only be recovered by natural regeneration under very specific and hard to reach circumstances. For details watch the video.
Or to stress one of the most overused quotes in software development: it's not a bug, it's a feature.