Soldiers are also provided with goggles to protect against lasers. A tank armed with a laser range finder could do it.
Tom Clancy had some of his characters bring down some aircraft in one of his books using a tightly focussed light that sent the crew into epileptic fits.
In the same book, a Japanese airline captain flies his fully fueled 747 into the Capitol building.
If an author can think of it and has researched it and found it to be plausible, why not a terrorist?
There so much a terrorist could do. It's most likely some bored kids just sitting on the hood of their cars under the approach path of the aircraft. Bored mormon kids. They can't drink so they may as well blind people.
