No.... I never had the "tunnel vision" What I had was a dark screen that the contrast adjustment would not restore, barely enough to see, but not enough to use, but it did exempt tunnel vision like symptoms. but that was because the contrast was too low i think.

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Thank you. Hmmm. Well at the risk of derailing the thread, do you have any idea what causes darker areas around the edge of an LCD screen? I looked at the screen last night and it's not actually dark, it's just dimmer around the edges than in the middle. I've also seen LCDs that look like they have a bruised spot in the middle, where the image is slightly darker/dimmer than on the rest of the screen. I've never mananged to imagine what could cause such effect in LCDs.