This, apparently, is from a promotion the mag. sent out and quoting should not be a copyright violation.
[ QUOTE ]
MAGIC EYES
They look like simple slabs of rubber or plastic. Yet they bend
light like a lens – and change their focus at the flick of a switch.
We investigate a new kind of optics, and why the Pentagon is so
interested…
[/ QUOTE ]
And it still sounds like the Kerr effect.
Want know everything about the
vacuum tube "magic eye"?