It's a fundamental principle of optics that when you put a dimly illuminated object next to a brightly illuminated object, the dimly illuminated object becomes less visible. This is why I use the mimimum amount of lighting possible.
Exactly. An oncoming bike with lights on full will prevent you seeing oncoming cars, all you can see is a blaze of light ahead, and you have to look sideways, and hope you care going straight ahead, and not drifting sideways.
It is possible this effect is not experienced by young people, as on average they have irises that can dilate far more those of older people e.g. 40+ years old, and hence they can dim the light and avoid being dazzled.
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