I haven't posted for a while, but I have vision problems too. PCS 2 1/2 years. Not darkness, but blurry or double vision. I have 20/20 vision but periodically at least once a day, but sometimes for long periods, I have intense blurry vision. Driving is near impossible, but sometimes it happens when I'm driving. Often it leads to nausea/motion sickness/throwing up. The frequency hasn't really changed, but I am better at dealing with it (I focus on something close, or run with a partner so I don't get hit crossing streets, manage to deal with the nausea). I remember reading another post by someone who had the same thing and was sent to an optomitrist for glasses - like that would help!