VSP has a great post entitled:
At PSEye, kids get the drops but don’t even realize it! I have 2 spray bottles that we use. They look the same but one is just artificial tears in which we have the kid wash his mom/dad or my eyes to get them all cleaned up. Then I let the person who had their eyes cleaned, clean the kid’s eyes with a spray bottle that has the “real” drops in it. It usually involves a ton of laughter instead of tears!