invisibleness

Yesterday I was at my optomatrist getting my eyes checked out. As he was looking at the back of my eyeballs I asked him if he could take a picture of them and email them to me. He said he could but his camera was broken and he couldnt get a part for it. After that he put these drops in my eyes to make the pupils bigger to check them out. When I left his office he gave me sunglasses so the bright light wouldnt affect me on the outside. Not being used to sunglasses when I went outside I felt invisible. I think the reason I felt invisible was that the colours were all dim and really it was I who wasn't seeing as well, but in my mind the perception was changed so I felt everyone else couldn't see or here me, so off I walked home singing realizing I was invisible.
Sometimes in our world the visible and the invisible connect in really unique ways. What is visible isn't always what is there. There is always more invisible than there is the visible especially with people. Vision takes in a great amount of information but at the same time leaves out a great amount of information. As we're processing the information the visible is a lot easier to process than the invisible. And this is even more true of relationships, kind of like the freudian iceburg.
How am I invisible and how does that affect my relationships?