How blurry? CRT blurry since text is never as clear as an LCD.
If it is blurry for a CRT, and you tried the focus knobs on top of the monitor, than you have have a tired monitor and it is time to take it in and get new parts. I think the flyback is the one that controls the focus and popping. I am no expert but I have one that has a green tint, has blurry text, and pops now and then. I spoke with a guy that repairs CRTs and he said the green can usually be adjusted, if the fuzzy text cannot be adjusted then it is time for some new parts.
I think he quoted me $80 for the part and $45 for an hour of labor. Not bad to get the old FW900 up and running again. I still had a perfect FW900 in storage so for now I put the other one away and will have it repaired if my current one ever goes out.
Blurry on bright areas (mainly white) to the point where they become almost unreadable.
Dark ones show little blurring at all.