BTW, for those of you who don't wear eye glasses, this might not be obvious:
Never use tissue, "Kleenex," toilet paper, paper towels, or any other paper product, no matter how soft it might feel. All paper is made from wood. You knew that already. But there are fine wood chips (very small, but still there) that will scratch any glass surface. It's not noticeable at first, but over time the scratches will appear (or the oleophobic coating will begin to come off).
I've ruined many pairs of glasses not really understanding this for a long time. And in worst case, use Bron019's suggestion: Use your shirt.