In reply to higherclimbingwales:
You're a funny guy.
Roger Webb, who anyone who has climbed in Scottish winter much will know by reputation or from the first ascent lists, sometimes contributes to these discussions on visors - advising people to get one. Roger lost an eye being hit by ice IIRC, and I know other ice climbers who have sustained nasty facial injuries from ice hitting them. If you don't choose to use one, that's your choice - but suggesting others aren't up to your manly standards if they do seems rather silly to say the least.
In reply to George Ormerod:
I've had the Petzl one and fitted it both to a Meteor and a Elios. A friend has fitted one to his BD Half Dome too without much effort, but of course as you need to drill you'll be going "off label" so expect no sympathy from anyone should it go wrong. I really liked it, they give much more protection - even when half up so working more like a cap than a full face visor - but my problem with the petzl one is that it snapped at the hinge in less than a season of use. It's just a piece of thin flexi plastic with what looks like a hole made by a hole punch in it where it fits to the hinge device. The hole is close to the edge so it was just about 5mm of thin plastic that cracked making it unusable. You can buy just the actual visor bit (minus the hinge mechs) but that's still like 20 quid. It felt like a bit of a rip off and I've never got round to fixing mine.
A guy I know uses the Petzl working helmet (vertex?) which can fit a google-like visor that looks tougher and better designed. Other climbers I know have the grivel 'cap-peak' sort of visor and like them. I'm currently mainly climbing in Mammut helmet (El Cap) which has a little peak on it, and have noticed even though its v. small even just that does help deflect ice a wee bit.
Clear safety glasses are another possibility to keep chips and small bits out of your eyes but wouldn't help protect ice sockets/cheek bones I guess. The Bolle work ones cost little and look really cool though!