While I will definitely heed the advice about getting my eyes checked, I did notice on my drive back this morning that it was just the odd one or two cars causing glare problems with the vast majority (regardless of whether halogen or brighter LED) being fine. My most recent cars have had safety settings for the lights so that they were not directed at on-coming traffic but it does seem that a few cars either do not have this feature or else the drivers themselves have not adjusted the settings correctly.

My own vehicle does have a minimal manual adjustment wheel on the dash which alters the height of the beam to account for the number of passengers carried but still points away from oncoming traffic. The ones that I noticed this morning clearly did not have this safety feature and their headlight beams seemed to be aimed directly at me. The trick, I guess, is to try and glance away to the left but not ideal on windy country roads with no lighting.