If I get hit once and get the blurred vision it will never go away no matter how much I eat or drink or attempt medical supplies. I see a number comments stating that is how it is supposed to be that the bug is clearing it out with the esc > video settings fix but honestly you get hid in the head once you may blur up for a few seconds but not hours.
I agree there is a bug with the esc menu but the length or infinite blurred vision from one attack is unrealistic.