OK stopped the bike on the cycletrack tonight and watched the on coming traffic. The yellow lenses did soften the glare or more acurately the corona of the headlights, although I am unsure if they actually lessened the intensity. They change the light from white to a yellow green which tends to take the sharpness off. Draw backs is although they are very lightly tinted they cut a little bit of clarity down.

I had to stop after a little bit as I was getting seasick with taking them off and putting them on again and staring at headlights

I need to head to the hardware store at the weekend so I intend to grab a pair of clear safety glasses to compare as its years since I had a set of those interchangable lens setups.