The sad part about having problems with vision or hearing loss is that many of us are just too vain to wear glasses or hearing aids which can give us a whole new perspective of the world around us. Whilst there have been contact lenses for more than half a century now, totally invisible hearing aids are just now reaching the market.   For the first time in the history of hearing aids, there is a new device which is placed directly into the ear canal in close proximity to the eardrum and is completely invisible from the outside. The...