1. Light intensity and color temperature
Many LED headlights produce a “cool white” or bluish light. This type of light has a higher color temperature, which appears sharper and more intense to the human eye than warm yellow light.
Our eyes are more sensitive to blue light at night, which makes glare feel stronger.
2. Eye adaptation at night
At night, our pupils widen to let in more light. This helps us see better in darkness—but it also makes us more vulnerable to sudden bright light.
When an oncoming vehicle appears, the sudden burst of brightness overwhelms the eye’s adaptation process, causing temporary blindness or “afterimages.”
3. Poor headlight alignment
Not all glare comes from technology itself. Sometimes headlights are simply misaligned.
A slightly tilted headlight can shine directly into the eyes of other drivers instead of the road. Even a small adjustment error can make a big difference at night.
4. SUV and truck height
Modern vehicles, especially SUVs and trucks, sit higher off the ground. This means their headlights naturally point more directly into the eye level of drivers in lower cars.
As SUVs become more common worldwide, this mismatch in height has made glare worse for many people.
5. Road conditions and reflection
Wet roads, fog, and reflective signs can amplify headlight glare. Light bounces off surfaces and scatters, making it harder to focus.
In cities with shiny asphalt or frequent rain, this effect becomes even more noticeable.
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