AFAIK, the human eye does not "alter its focal length by changing it's shape". It doesn't alter it's focal length at all! Unless I'm in the minority in being unable to zoom in and out. <g>
you can't??? you must be kidding. the next thing you'll tell us that you focus your eyes by turning a knurled ring and adjust to the light using click-stop dials?
but seriously, they (phillips) seem to use capillar forces to do the trick, which should limit the lens diameter to pretty small sizes. in theory anyway.
mishka
