Minecraft is blurry [closed]

When I enter a world for few seconds everything is normal and then it goes blurry. I thought it was something to do with my laptop overheating so I let it cool but that did nothing. I was able to play for few hours normally and then this started. After Googling I found that this might be something called super secret setting, but with that, the GUI would be normal. If I go back to main menu then everything is normal again. What is causing this and how do I fix it?

I'm playing a Minecraft modpack called RLCraft 2.

Solution 1:

EDIT: This is an issue caused by the ENhanced visuals mod. Removing the mod fixes it.

(moved from edit by OP to question, where it doesn't belong, to an answer)

Solution 2:

You can see in the bottom right corner of your status-bar that you are dehydrated. Shift-Right click a water-source a bunch of times and it should become less blurry.

It's not some error, it's part of the whole dehydration mechanic of the mod-pack.