Wait a second, if anyone knows how to measure a display's light emission, please let me know, it would be a good test. But here, not to measure an accumulated emission value, instead we should be able to measure the harmful emission spikes. That's because the overall screen looks normal, even after altering brightness/contrast/etc, but the emitted spectrum shall contain the spikes somewhere, which then causing the problems.
An oscilloscope i have here, i'd happily do such experiments
BR,
tsb