Why Glare is Worse at Night

Driving after dark can be tough for many people, even those with otherwise healthy eyes. One of the most common complaints is glare—bright halos around headlights or reflections that seem more intense than during the day. But why does glare feel so much worse at night? The answer comes down to how our eyes adjust to low light and the way light scatters inside the eye.

How the Eyes React to Darkness

Knowing how the eyes work helps to understand why glare worsens at night. Light enters the eyes through the pupil, that black dot in the middle of your eye. The camera lens was modeled on the human eye. Like a camera aperture, the pupil widens when there’s less light in order to allow more light rays to enter the eye—because light enables visibility.

So, while this widening of the pupil lets a person see in dark conditions, it simultaneously allows more stray light to enter. Instead of being focused cleanly on the retina, some of that light scatters, creating a hazy glow or halo effect. This is why headlights or streetlights can seem almost blinding compared to their daytime appearance.

Common Causes of Night Glare

Certain eye conditions make glare more noticeable. Cataracts in Champaign, IL, for example, cloud the lens and scatter light more severely. Dry eye can also increase glare, since an uneven tear film changes how light bends as it enters the eye. Even uncorrected vision problems, like nearsightedness or astigmatism, can exaggerate nighttime glare.

Daily Impact

For many people, glare is more than an annoyance—it can affect safety. Driving becomes stressful, especially on busy roads where headlights shine directly into your line of sight.

If glare is interfering with your daily life, it’s worth scheduling an eye exam with your optometrist in Champaign, IL. Contact Champaign Eye Professionals to book your appointment.