Why?

     I often wonder why certain things are the way they are when it seems contrary to my particular logic.  My recent purchase of a new pair of glasses which included cleaning liquid and cloth.  I was warned not to clean my new glasses with my shirt because the lenses could get scratched, but I opted for the scratch resistant lens so what was the worry.  I was told they are "scratch resistant" not "scratch proof". The definition of "scratch proof" seemed obvious in that they can't be scratched but "scratch resistant" seems more vague.  

     How resistant to scratches are my lenses if you can't use a cotton shirt to clean them?  This is somewhat puzzling since I always wear a cotton shirt and my shirt tail seems like a perfect vehicle for cleaning my glasses. The shirt tail is readily available and always at my beck and call and if some moisture is needed because of caked on dirt then isn't that why God made saliva.  

     The answer seems obvious to me.  Opticians need to make lenses that can be cleaned with your shirt tail and saliva.  It makes perfect sense and it could be a great marketing campaign.  Maybe use a snarky-animated character like those insurance commercials. Yes, I know the guys selling the cleaning liquid and cloth wouldn't like it but sometimes you just have to choose who you want to please.

     Using saliva to clean your lenses may disgust some people because society is so concerned about germs but I don't think germs can jump from you lenses to your eyeball. I can almost hear people grabbing their hand sanitizer and spritzing their self at just the thought of using saliva on their glasses.  This is just one of many things that puzzle me but I think MacGyver would be proud of my ingenuity.