If a momentary flash of light caused all those problems, your eyes were not healthy in the first place.
LOL
That reminds me of a neighbor many years ago, a really stupid nasty lady who made everyone crazy with her unreasonable requests and demands, and inability to understand what anyone would tell her, etc.
One day, she was in a car accident, strangely, not found to be her fault, but the other driver's fault....and she was pretty banged up, including a head injury.
Well, her attorney sent her for examination, and it was found, in a nut shell, that "The accident rendered her stupid and unable to understand what others were trying to tell her, as well as altering her moods, so that she was perpetually bitter and angry".
So, luckily, she got a large settlement for sustaining all that brain damage, and was able to move away, never to bother us again. (The Lord works in mysterious ways?)
So, not that I don't feel for a person's pain and suffering, its just that there is a very real human tendency to attribute effects to events.
If there was no awareness of the problems before the event...its like it didn't exist before the event...pretty reasonable really. If "Something happens", and then, the problems are "brought to light", it is arch-typically associated with the event.
To complicate matters, a person may have NEVER known for example that they had an eardrum about to rupture, until a guy at a fund raiser used a megaphone to announce the brownies arriving at table #3, etc...and the ear drum ruptured.
A pregnant woman about to give birth might have her water break on the way to the hospital when she heard the announcer mention a flood in Indonesia...and insist that her water broke on the way to the hospital because she heard about the flood in Indonesia.
The ear drum might have ruptured in a traffic jam on the way home, the water might have been about to break anyway, and so forth...but the people who's eardrum's burst and who's water broke KNOW it was because the megaphone was too load and because of the Indonesian flood....and you will NEVER convince them otherwise, unless they are a LOT more open minded than your average person.
So, I don't think one flash will do what its been blamed for, but I do know that people's eye can slam shut so to speak if hit with a strong light...and that it does cause physical pain, and that pain is natures way of staying "STOP that!".
The lux ratings for hand-held lights are not even producing the lux considered normal exposure for being outside on a sunny day...so the odds that the light was more powerful than that is unlikely....but dedicated throwers, such as an Olight SR90 (Al large black flashlight...) could match direct sunlight, so whatever looking into the sun would do, is what those lights could do if they were able to produce in the 100,000 lux range...but..
... a thrower's beam can't be measured at as close a distance, as it will be LOWER too close...due to collimation/convergence of the beam needing some distance to happen. So, a light that has 100k lux at one meter will measure a lot less than that at point blank range....and is one of the reasons we might measure it at 5 meters, or even further away, to see the full Lux, back-calculated to the one meter standard for comparison/ultimate range projection purposes.
So, most cops want a floody light rather than a tight spot, if they are experienced with both, and if they are not ONLY using the light in a tactical shooting-scenario...as searching/FINDING people is a LOT easier with a flood beam that shows an entire warehouse, than a little circle of light you are sweeping around like looking through a paper towel tube at the same scene.
If a cop used a strong thrower, for a long time, aimed right back through your eyes, AND you LEFT THEM OPEN the whole time (Hard to DO)...then it was like looking at the sun for that time period...
And LOTS of people HAVE looked at the sun (See all the eclipse warnings...) and had a problem, but, most don't. Most look away or close their eyes because they can't help it. More damage is actually suffered when the people who did suffer symptoms actually used telescopes and binoculars to look at the sun, than with the naked eye...as that obviously magnified the effects.
If your glasses did the same thing as binoculars or a telescope, I'd be a little surprised, as the glass itself filters out much of the UV at least, as is supposed to be just replacing a lack of general ability to focus...in that the average eye glass lens is not really shaped like a magnifying glass...as that would only make things look larger, not clearer...and I don't remember success using eye glasses to pop ants on the sidewalk, whereas a magnifying glass was a veritable death ray.
So, I don't think this all justifies making cops have less capable lighting equipment. Training maybe on its uses, but, I think the lighting, especially on average, needs a HUGE boost, not a throttling down.
OK, I just checked - If I put my eyes RIGHT in front of the lens of a bright flashlight, it actually hurts LESS than a few feet away.
So, I have confirmed to myself at least, that a light with the required lux to be as bright as ordinary daylight, would have to be held far from the eyes to put enough lux on target to simulate it.