Ha! Thanks for the fact-checking. 
I guess in real life, Owen would’ve went home alone.
Somehow I think I could have lived my entire life without acquiring that image. What i would have missed without the SD!
But never use the same bottle in your facial openings afterward. You will likely get a nasty case of stink-eye or brown-nose.
Slate’s advice columnist, Dear Prudence, had someone write in several years ago about his monstrous mother-in-law, and one of her offenses was making a disliked relative sick at dinner with Visine in his food. DP took the letter at face value and advised as to how to deal with such a literally toxic individual. She did not investigate the plausibility of such a poisoning.
So did we ever answer the OP?
I’m going with what Oredigger and Quadgop said.
I think we lack hard and precise evidence as to what the minimum amount to kill an adult is. But given how gravely ill consuming 2-3 ml made some toddlers, it would not surprise me to find that 10 ml could kill some adults.
Damn, that’s frightening