Night driving is visually demanding. The combination of dark backgrounds, oncoming headlights, and street lighting creates high-contrast glare that the visual system has to constantly manage. For a lot of people, this is uncomfortable but manageable. For others, it causes genuine headaches, anxiety about driving at night, and a noticeable decline in confidence behind the wheel after dark.
The good news is that in many cases there is a straightforward explanation and a practical solution.
Why glare causes headaches while driving
When you are driving at night, your pupils dilate to let in as much light as possible. The larger your pupil, the more of the lens inside your eye is used to focus light. Most lenses, including the natural lens in your eye, are not perfectly uniform. At larger pupil sizes, optical imperfections that are invisible in daylight start to affect the quality of the image. This can produce halos, starbursts, and glare around lights, and forces your visual system to work harder to resolve what you are looking at.
An outdated prescription is a common culprit
If your glasses prescription has changed even slightly since your last test, the mismatch between your actual refraction and your current lenses becomes much more apparent at night. An outdated prescription that feels fine in daylight can produce noticeable blur, halos, and visual fatigue under low-light conditions. If your glasses are more than two years old and you have noticed increasing difficulty driving at night, a prescription update is the first thing to investigate.
Anti-reflective coating makes a significant difference
Standard uncoated or basic-coated lenses reflect light from their surfaces, adding internal glare to what you are already experiencing from the environment. A quality anti-reflective (AR) coating eliminates most of this internal reflection, allowing more light through to your eye and reducing the perception of halos and starbursts around lights. Many patients notice an immediate improvement in night driving comfort when they switch to glasses with a premium AR coating.
When glare at night signals something more serious
Increasing glare sensitivity, particularly if it is progressing over months or years, can be an early sign of cataracts. Cataracts cause the natural lens inside the eye to become less transparent, scattering incoming light and creating pronounced glare and halos at night. Cataracts are very common over the age of 60 and are treatable with surgery. An eye test will identify early cataract development well before it significantly affects daytime vision.
Increased glare can also be associated with corneal changes, dry eye, and some medications. A thorough examination is the only way to identify the specific cause.
The legal driving standard in NSW
NSW law requires a minimum corrected visual acuity of 6/12 to drive a private vehicle. If your vision has declined since your last test, you may not meet the legal standard without updated glasses. Commercial drivers face stricter requirements. An optometry report is required for licence renewals in some circumstances.
At Prime Optometrists Auburn, a comprehensive eye examination includes a full assessment of your driving vision, prescription, and lens health. We see patients from Auburn, Berala, Lidcombe, Granville, Merrylands, Parramatta, Guildford, Regents Park, Silverwater, Strathfield, and across Western Sydney. Book online or call (02) 9761 0005.