>>In my experience actually treating an eye injury in the field (there was an Opthalmologist along on that trip) and also using the solution to irrigate other lacerations, we needed a larger volume of fluid than you would imagine.

I would second that comment. I have a few of the single use ampules in my kit, but, they are probably not useful for much more than moistening the eye. The last time one of the boys had something in their eye on a camping trip, we went through a 12 oz bottle of saline, and could have used more. I had one of those small 4 oz bottles of eye wash in the FAK, but, it was half used and not replaced (probably my fault), so I went in my backpack and had a bottle of saline for my contacts. We still had the eye cup in the FAK, which we dropped in some boiling water briefly (only because we already had water on the boil for some cocoa). Ok, not sterile, but, cleaner than the stuff in his eye anyway?

Having an eye cup can really help when you're trying to dislodge something that doesn't come right out easily. It's also probably easier to use on yourself if needed, you can blink while the rinse is still on your eye, and it works wonders. Then you can furthur irrigate without the cup to make sure it's all rinsed from the eye and lid. I've heard there are different views on using the eye cup, but, they have worked for us a few times, so we'll keep one in the big kit for the troop.