I have the same bug on my Fallout 4 on PS4. Hopefully they will patch the game very soon to solve this problem.
The edges of my screen blur when I go into conversation mode....it is odd.
http://www.gamefaqs.com/boards/164592-fallout-4/72794350
The only way to get rid of the blurry vision is to load a previous game save, you obviously need to choose a save before the problem started. I had to do this myself, I went back about 4 levels but its worth it to have the graphics working properly again.