Hi. I don't raise ducks, but I have chickens that have had eye problems. Rinsing with the saline is good if it is sterile. I found that the best thing I have been able to do for my chickens when they get a hurt/scratched/injured eye is to use Vetericyn Ophthalmic Gel. It costs about $30 for a 2 oz bottle, but it has cleared up every eye issue I have dealt with so far.
You can get it at Murdochs, and probably any other ranch supply place. It is really worth the investment.
You can get it at Murdochs, and probably any other ranch supply place. It is really worth the investment.