^^^That's exactly what I was thinking. Just the other week our black GSP got a weed seed deep into his eye and he had to be taken to the vet to get it flushed out.

I say hunt 'em where the birds are and after the hunt check your dog regularly. Most of the time if there is something in their eye it will start to run or matter and if it gets bad enough it might swell shut. If you're concerned about your dog (it seems that you are) check them regulary cuts, gouges, seeds, etc.