This finding raises the question: can asmalldiameter lead be sufficiently robust to perform reliably over years of biologic exposure and mechanical stress in the human body?
With skyscrapers, the deep foundation systems overcome this issue by drilling or hammering in a series of relatively small foundation piers (3ft or 1m in diameter or so).
Besides having unusual optical properties and being very small each is just one-twentieth of a millimetre in diameter the lenses have another trick of particular relevance to micro-optical systems.