Don’t use someone else’s prescription eye drops. Yes, you need to use Tears Naturale II eye drops while carrying contact lenses. Yes, some eye drops do have benzene in them. Give Atropine eye drops 2 drops every 4 hours as wanted for congestion. You can contaminate your eye drop bottle if the tip touches your eye. Your eyes mechanically and reflexively blink when one thing touches your eyelashes or eye surface.