Could always try laser-resistant glasses.
Sometimes the obvious is just too obvious. Good call.
The airline could hand laser-resistant glasses out to all passengers along with the brown bag lunches. Or maybe they could sell them as an added-cost option like the movie headphones.
"Ladies and gentlemen, this is your captain speaking. We are experiencing some unexpected infrared laser radiation aimed at our aircraft and I've turned on the overhead 'Laser' warning light. Please put on your laser-resistant glasses until the threat is over. Thank you for your cooperation."