As I posted here on 31st Jan 2012 it might be possible to adapt LCD welding goggle/shield technology. For those not familiar, the technology allows the welder clear vision to strike the arc but the goggles/shield becomes almost instantly nearly opaque when a built in sensor detects bright light. The response is less than half a millisecond (sic).
https://en.wikipedia.org/wiki/Welding_helmet
There may be reasons why it's not appropriate for cockpit use but I hope they've looked into it. The technology is now under the control of 3M who have the resources to develop something usable.