I had CK, what...about 6 weeks ago now. I have had some vision issues though mild relatively. I definitely have dry eye on that side. Dr. Chang at Stanford said this is from the trigeminal nerve and not unusual. I saw my eye doctor, who confirmed the "dry" eye and confirmed my observation that my vision has changed some. I wouldn't say that it's blurry exactly, but my eyes are more tired, my vision less clear. What I could see well enough before without my glasses, I now have to use glasses for and then sometimes it's not really enough. The eye test indicated a need for stronger glasses prescription, but the eye doc wanted to hold off to see if it settles down. He said that the trigeminal nerve also controls the muscles that focus the eye. With the stress on these nerves from the radiation, it is harder for them to work now, plus just the healing process takes body resources and eye muscles aren't on the physical priority list (or something to that affect). Hope that helps.
I would suggest you see an eye doc to get it checked. It might not be related since everyone's situation is different and I don't think everyone has trigeminal nerve involvement.
Connie