The old expression that says "you just know what you have until it is gone" really is something to pay attention to in the modern world. Take for instance, if you are born with sight you see the world visually and all that it is comes to you through those wonderful portals of reality.
But for an instance take the ability to see away and you get a whole new sense of what it means to appreciate things that you have. I say this because I had a bought with Pink Eye (Conjunctivitis) over the last week and it really takes your vision and plays havoc on the true ability to see. You wake up looking through what appears to be a spider web of gunk, and due to this gunk your eyes may not even open, and when they do the vision that you do have is really really blurred (hello cataracts). Boy howdy thank goodness for anti-biotics.
Well today I awoke without the gunk and my vision is clear, and I can even see in the sunshine (typically the cure for Pink Eye makes you really light sensitive)but I do appreciate the vision that I was born with and will do everything in my power to preserve this wonderful gift of sight!