I always flashed my headlights when a car approached at night with no lights on, and now I increasingly do so to cars with only one.

And what happens when YOU dazzle the oncoming driver , they crash into YOU.

Very clever.

The recent;y announced crack-down on eyesight testing, especially among the elderly (and I count myself as one!) has more than likely been made as a result of the modern trend to fit LED headlights to new cars, and also to retro-fit old ones. Virtually everybody I know, old and young, complains about the dazzle from them. The regulations were written so long ago that LEDs had not reached the brilliance they now have. They might very well obey the regns. as regards the number of Lumens emitted, but they still dazzle, and no doubt accidents have been caused (but of course nothing can be proved...)

And don't get me started on the number of cars, vans, lorries and even buses, with one dead headlight! Being "old school" I always flashed my headlights when a car approached at night with no lights on, and now I increasingly do so to cars with only one. And they are often LED - so much for their vaunted longevity!

We don't know each other but I don't complain about dazzle because I don't get it - at least not since I had my cataracts done.

On the subject of outdated regulations, the DVLA/DVSA standard for eyesight is too low and needs to be increased - as well as mandatory regular sight testing for drivers of ALL AGES.

On this general topic, I have been a driver for about 60 years, and it's a long time since I have felt that the lamps on my car were too dim and I wanted brighter ones. But I am sure our esteemed providers have gone unnecessarily far in their Star Wars of ever-brighter headlamps. I am also sure that it has been done in the name of H&S, to make moving cars more conspicuous in broad daylight, without any attempt to reduce output in darker conditions. I don't believe that would be rocket science, but it has lately become just a game for stylists.

Being "old school" I always flashed my headlights

I hate it when people flash their lights at me to say 'thank you'. It wrecks my night vision for a few seconds.

Incandescent headlights used to have a particular wattage requirement in the vehicle lighting regulations. I believe that has been removed but has it been replaced by a requirement for the beam intensity or can manufacturers choose how bright the lights should be?