No, I think our Australiohunnish friend is on to it. I used to get both migraines and the tunnel vision that went with them. The vision problem is not a pyschiatric issue, it's purely physical. Too many people complain of the same symptom for it to be a figment of anyone's overwrought imagination.

Many moons ago my tame quack believed that it had a lot to do with pressure on the optic centre in the brain which either constricted the signal from the eyes in some way or caused the brain to fail to process the incoming data correctly.

Whatever, it's a fair cow when it happens to you!

- Pfranz