for me, the preference of color of my lenses helps with all of the glare and distraction and visual stimuli overload i would experience without the purple glasses..... fluorescent lights not only shed a blue/purple light, they also flicker. incandescent lights generally give off a more glaring light blue light unless they're full spectrum lights and halogen lights tend to show in the bright yellow to orange range. i've not experienced how my purple lenses fare with halogen lights as yet.
as far as the eye contact goes, i noticed the tinted lenses had the added benefit of defraying unwanted eye contact.... perhaps they are giving people a broader focal point than to be able to see directly into my eyes. i also consider that my own eye movements may not be as noticeable to other people. whatever the exact cause and effect of the tinted lenses truly may be, i find they help greatly.
i've never experimented using other types of "sun glasses" (i use that term reluctantly, because i don't need to wear my tinted glasses outdoors unless where there may be many people), but i would hypothesize that if a person is comfortable with the more common colors of tinted lenses like yellowish brown or greenish brown, that those glasses would have a similar effect with defraying unwanted eye contact.

Thanks for that contribution. What you describe is exactly what I hope to benefit from. Mine are on the way in the post.