I had a blind cat and learned to use organic chammomile tea. He got freq eye problems and most of the time a few days of gently wiping it with a dampened cotton pad would keep us from needing the Vet.
I made the tea strong - about a 1/3 c of water to 1 tea bag, let cool and cover. It's good to use for a couple days before making fresh.
They sell it at most groceries.