There is nothing wrong with rubbing spit in eyes, it was an acient remedy to cure eyesight and is still recommended as a home remedy for eye sight.
" Rub your saliva onto your eyes.
I know this sounds a little awkward, or perhaps you won’t even want to try this. But it really helps. It is an ancient method of improving eyesight. Rub your saliva like Kajal(KOHL) in morning, without having your mouth washed or cleaned. You are not supposed to do this after drinking or eating something. Continue this until changes are obvious."
http://healthnbodytips.com/improve-eyesight-naturally.html/