I'm sure many of you have seen this image floating around online at some point.
It seems a rather neat idea, though I'd be worried about any sort of accident, or even potential fight, ripping that piercing right out.
But, what if the lenses attached with magnets instead?...
Not very strong. Your fingers are extremely sensitive, so once nerve endings form around the implant you should be able to feel almost anything. Rub a single hair across your finger and you can feel it, now imagine that your finger is 20 times more sensitive or that that hair is imbedded into your skin.