Neosporin Ophthalmic Ointment is often used for eye infections in chickens, but I believe it is no longer over-the-counter. Regular Neosporin (without pain reliever) will work. While it says on the package not to get in eyes, it was actually recommended to me by an eye doctor and has the same ingredients as the one for eyes. With Silkies, it's also important to trim their feathers around their eyes as that is usually the cause of the infection. Also, keep them away from dusty bedding and be wary of chickens attacking them while their eyes are hurt.