Night Driving Glare in Edmonton: 7 Causes and What Fixes Each
Night Driving Glare in Edmonton: 7 Causes and What Fixes Each
Night driving glare has seven distinct causes, and only some of them are fixable with lenses. Uncorrected astigmatism, an outdated prescription, a wider night pupil, scratched or uncoated lenses, a filmy windshield, early cataract and dry eye each produce a different glare pattern. Matching the pattern to the cause tells you what to fix.
That is the whole method. Four of the seven start with an optometrist — and one of those four eventually ends with a surgeon. One is pure optician work. Two you handle yourself in your own driveway for less than the price of a coffee. The one thing that fixes none of them is the product most people search for first: a pair of yellow-tinted night driving glasses.
The pattern is the diagnosis
Spikes, a ring, a milky wash and a smear that clears on a blink are four different problems.
Yellow tints have no evidence
A 2019 JAMA Ophthalmology simulator study found no benefit, and the tint removes light.
Edmonton loses over six hours
13 h 40 m of daylight on 1 September becomes 7 h 28 m at the December solstice.
Age changes the stakes
In that same study, headlight glare cost older drivers 1.5 seconds of reaction time against 0.3.
Why does night glare get worse in Edmonton after October?
Because the driving does. Nothing about an Edmonton winter changes your eyes. What changes is how many of your trips happen after dark, and at 53.5° north that change is enormous.
Using sunrise and sunset times from the U.S. Naval Observatory for Edmonton's coordinates, the city goes from 13 hours 40 minutes of daylight on 1 September to 7 hours 28 minutes at the December solstice. That is a loss of six hours and twelve minutes — more than six hours, not the seven you sometimes see quoted.
| Date | Sunrise | Sunset | Daylight | Lost since 1 Sept |
|---|---|---|---|---|
| 1 September | 6:43 a.m. | 8:23 p.m. | 13 h 40 m | — |
| 26 October | 8:22 a.m. | 6:13 p.m. | 9 h 51 m | 3 h 49 m |
| 15 November | 8:00 a.m. | 4:36 p.m. | 8 h 36 m | 5 h 04 m |
| 21 December | 8:48 a.m. | 4:16 p.m. | 7 h 28 m | 6 h 12 m |
The practical version: on 21 December, civil twilight in Edmonton is over by 4:59 p.m. A five o'clock drive home from Ellerslie Road is a fully dark drive. Both ends of a normal workday sit in the dark, so a glare problem that was a mild annoyance in August becomes the thing you think about twice a day.
This is why complaints about headlights arrive in our chairs in a wave from late October. The glare was always there. The exposure to it just tripled.
What are the seven causes of night driving glare?
Glare is not one symptom. It is a family of them, and the family members look different. Ask ten people what a headlight looks like to them and you will get spikes, rings, milk, doubles and smears — and each of those words points somewhere else.
Nobody can describe their own glare accurately in words. Everybody can recognise it in a picture. So pick the picture.
Which one of these is your windshield?
Seven specimens of the same oncoming headlight. Pick the one that matches what you actually see and you get the cause, a test that confirms it, the fix, and who does the fixing.
Plate 1 — Streaks and spikes
Book an exam-
What it is
Uncorrected or under-corrected astigmatism. An astigmatic eye focuses one direction ahead of the other, so it cannot bring a point of light to a point. It stretches it into a line instead.
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The tell
The spikes point the same way every night, and they tilt when you tilt your head. Cover one eye at a time: the two eyes rarely share an axis, so the pattern usually changes between them.
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What fixes it
A current prescription carrying the right cylinder and axis, in glasses or toric contact lenses. Of all seven causes, this is the one people notice fixing the most.
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Who fixes it
An optometrist measures it, an optician builds it. Bring your current glasses so the old and new numbers can be compared.
If that is not it
If the light is soft with no sharp point in the middle at all, you are looking at Plate 2, not this one.
Every plate is a drawing of the same optical effect, exaggerated so it is visible on a phone. Real glare is subtler, and two causes often run together. The full table is directly below.
| Cause | What you see | The tell | What fixes it | Who fixes it |
|---|---|---|---|---|
| Uncorrected astigmatism | Streaks and spikes that tilt with your head | The pattern differs between your two eyes | A current prescription with the right cylinder and axis | Optometrist, then optician |
| Out-of-date prescription | Soft glow with no sharp core | Daytime vision is soft as well | An up-to-date refraction and new lenses | Optometrist, then optician |
| Wider pupil in the dark | Soft glow, but only after dark | Daytime vision is sharp | Sometimes a small prescription written for night use | Optometrist |
| Scratched or uncoated lenses | Even spokes, or a faint second copy of the light | Take the glasses off and the pattern goes with them | New lenses with anti-reflective coating | Optician |
| Filmy windshield | A milky wash across the whole pane | The same light looks clean through the side window | Clean the inside of the glass; replace worn wipers | You, tonight |
| Early cataract | A ring around bright lights | Blinking changes nothing; it is the same eye every time | An exam, an updated prescription, surgery later | Optometrist, then surgeon |
| Dry eye | Smears that clear for a second or two when you blink | A hard blink resets it every time | A drop before you drive, plus treating the cause | You tonight, optometrist after |
Two of them at once is the normal case
Most people arrive with a combination: a prescription that has drifted, lenses that have not been replaced in five years, and a windshield nobody has cleaned on the inside. That is good news. It means the first two or three fixes are cheap, fast and stack up.
Why do headlights look like starbursts?
Almost always astigmatism. It is the single most common answer to this question, and it is the one people are least likely to guess.
The Canadian Association of Optometrists describes astigmatism as a refractive error in which the cornea or the lens inside the eye is “slightly irregular or cylindrical in shape,” which “prevents light from focusing properly on the retina, resulting in vision being blurred or distorted at all distances.” Most people have some of it. Small amounts often need no treatment at all.
Here is why it shows up at night specifically. A round lens focuses a point of light back to a point. An astigmatic eye is not round in the same way in every direction, so it brings one direction into focus in front of the other. A point source never gets to be a point. It becomes a short line.
In daylight that costs you a bit of crispness you have probably stopped noticing. At night, when a single blazing headlight sits in a black field, that same short line is suddenly the brightest thing in your visual world. Add the light your lashes and tear film throw sideways, and two lines at different angles read as a cross, a flare, a starburst.
Three things make it worse after October in Edmonton and none of them are your eyes: more hours in the dark, a wider pupil pulling light through the outer edges of your optics, and a windshield that has been collecting film since spring.
If you wear progressives
A progressive lens carries its clear distance zone in a corridor rather than across the whole lens, so head position matters more at night than it does by day — particularly when you flick to a mirror instead of turning your head. That is a fitting question, not a defect. Our progressive lenses page covers how the corridor is positioned, and it is worth raising at your next appointment if mirrors are where your glare lives.
Why do I see halos around lights at night?
A halo is a ring, and a ring means light is being scattered rather than mis-focused. Two things scatter light on its way to your retina: your tear film, on the outside, and the lens inside your eye.
You can tell them apart in about three seconds. Blink hard three times. If the light snaps sharp and then smears again, that is the tear film. If nothing changes, look further in.
The lens inside your eye is normally clear. When it starts to cloud, that is a cataract. The Canadian Association of Optometrists lists these among cataract symptoms, in its own words: “Halos or ghost images,” “Increased sensitivity to light and glare (for example to sunlight or oncoming headlights),” and “Trouble with night driving.” That is a strikingly precise description of the complaint that walks into our office in November.
There is measured evidence for how much this costs a driver. In a 2019 driving-simulator study at the Schepens Eye Research Institute, researchers found that “Cataracts increase the light scatter within the eye and thereby reduce the contrast of the retinal image,” and that with simulated cataract in one eye, “pedestrian detection rates decreased and response times increased with oncoming” headlight glare. They then verified the same effect in six patients who had already had cataract surgery on one eye and were waiting for the other, measured before and after that second surgery.
None of that means a halo is an emergency. Early cataract is monitored, not rushed, and an updated prescription often buys several genuinely comfortable years first. What it means is that a ring around headlights earns an eye exam rather than a tinted lens. Our cataracts page covers what the assessment involves and when surgery enters the conversation.
Do yellow night driving glasses work?
No. This is the clearest answer in the whole post, and it is the one worth carrying away.
In 2019, researchers at the Schepens Eye Research Institute at Harvard Medical School put 22 people in a driving simulator fitted with a purpose-built headlight-glare rig. Each person drove scripted night scenarios in three different commercially available yellow-lens night-driving glasses and in clear lenses, with the glare on and off — eight conditions each. They measured how long it took to spot a pedestrian.
“Using a driver simulator equipped with an HLG simulator, yellow-lens night-driving glasses did not appear to improve pedestrian detection at night or reduce the negative effects of HLG on pedestrian detection performance. These findings do not appear to support having eye care professionals advise patients to use yellow-lens night-driving glasses.” Hwang, Tuccar-Burak & Peli, JAMA Ophthalmology, 2019;137(10):1147–1153
The physics is not mysterious. The same paper notes plainly that “Yellow lenses filter out shorter-wavelength light and reduce the overall light level.” A tint's job is to take light away. On a bright afternoon that is exactly what you want. At 5 p.m. on an Edmonton December evening it is the opposite of what you want, because the pedestrian in the dark coat at the edge of your headlights needs every photon he can get.
The study did find something important, though, and it was not about the glasses. Oncoming headlight glare itself delayed reaction to a pedestrian, and it hit older participants far harder: a 1.5 second penalty for the older group against 0.3 seconds for the younger one. At 60 km/h, 1.2 extra seconds is about twenty metres of road. That gap is the real finding, and no tint closes it — an accurate prescription and a clear windshield are what narrow it.
Do anti-glare glasses for driving work?
Some of what gets sold as an anti-glare lens does something real. Some of it does nothing after dark, and some of it actively costs you light. Here is the honest split.
| Option | How it is sold | What to expect after dark |
|---|---|---|
| Yellow or amber “night driving” tint | Cuts glare, brightens the road | No measured benefit. In the 2019 JAMA Ophthalmology simulator study, yellow lenses neither improved pedestrian detection nor reduced the effect of headlight glare, and the tint removes light you need. |
| Anti-reflective coating | Anti-glare glasses | Real but narrow. Bare lens surfaces reflect part of the light hitting them, and those reflections show up as faint second copies of a headlight. The coating cuts them. It does not change how your eye focuses. |
| The right cylinder and axis | Rarely sold as a glare fix at all | The biggest single change for most people who see spikes around lights, and it is just an accurate prescription. |
| Polarised lenses | Glare-killing | A daytime lens. Built for reflected glare off snow, water and wet asphalt, and tinted, so it takes light away. LCD dashboard screens emit polarised light, so some of them dim or blank behind a polarising filter. |
| Photochromic lenses | One lens for day and night | Clear at night, so they stay out of your way — see our transition lenses page. Being clear also means they do nothing about headlights. |
| A clean lens and a clean windshield | Not sold as anything | Free, and it removes the single largest share of the glare complaints we hear at the counter. |
Notice the shape of that table. The two things that help most are an accurate prescription and clean glass. The thing marketed hardest is the thing with no evidence behind it.
Three tests you can run in your own driveway
You do not need equipment to narrow this down. You need a parked car, a streetlight and about two minutes. Do these before you spend anything.
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Test 1
The blink test
Look at a distant streetlight. Blink hard, three times, and watch what the light does in the second right after.
Snaps sharp then smears again: your tear film. No change: the problem is deeper than the surface.
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Test 2
The cover test
Same light. Cover one eye with your palm, then the other. Compare the two pictures rather than judging them together.
Only one eye: that eye needs looking at. Both the same: think prescription, lenses or glass.
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Test 3
The glass test
Take your glasses off and look again. Then look at the same light through your open side window instead of the windshield.
Better without glasses: the lenses. Better through the side window: the windshield.
Three tests, and between them they sort seven causes into the right pile. If the blink test changes things, start with dry eye. If one eye is clearly worse, book the exam. If taking your glasses off helps, the lenses are the problem and no exam is needed as long as your prescription is current.
What to fix tonight, and what needs an appointment
Two of the seven causes you can do something about before you drive home. Start there, because they are free or nearly free, and because clearing them makes the rest easier to see.
Clean the inside of your windshield. Nearly nobody does. A film builds up on the inner surface from off-gassing plastics, and it is joined in an Alberta winter by wiper haze, road salt and whatever the last cold snap put on the glass. That film scatters every headlight beam across the entire pane, which is exactly the milky wash in Plate 4. Then replace wiper blades that chatter or streak.
Stop dry-wiping your lenses. Dragging grit across a dry lens with a shirt tail is where most fine scratches come from, and each scratch scatters a spoke of light. Wet the lens first, then use a proper microfibre cloth. Fogging as you get into a cold car is its own night-driving hazard, and an anti-fog cloth handles both jobs.
Aim the vents at the windshield, not your face. Warm dry air blown straight at your eyes speeds up tear film break-up, which is the smear in Plate 6. In a furnace-dry Alberta winter that is a bigger contributor than most people expect. A lubricating drop before you set off does more than any tint.
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For scratches and fog
Cleans without dragging grit, and keeps lenses from fogging as you get into a cold car.
$3.99
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For the smear
A lubricating drop before you set off, for the glare that clears for a second when you blink.
$35
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For longer drives
A thicker formulation for a longer-lasting effect on a long, dry winter commute.
$42
The other five causes need someone to measure something. Three of them — astigmatism, an out-of-date prescription and a pupil that opens wider than your lens design allows for — are found in a refraction. A comprehensive adult eye exam at Charm Optical is $99 when it is not covered by AHCIP. AHCIP covers an eye exam for Albertans under 19 and 65 and older, and for certain medical conditions. Eye exams are by appointment. Our Edmonton eye exam page sets out what a comprehensive exam includes, and our services page covers the rest of what we do.
Do not sleep on these
Night glare is usually a slow story. These versions are not, and they are reasons to be seen the same day rather than next month:
- Glare or halos that appeared suddenly, over hours or a couple of days
- Halos with eye pain, a headache, redness or nausea
- New flashes of light, a shower of floaters, or a shadow or curtain in part of your vision
- Glare in one eye with a real drop in how well that eye sees
Call us at (780) 490-0090 and say what changed and when. If it needs an emergency department or an ophthalmologist rather than us, we will tell you that plainly and quickly.
Night driving glare FAQ
What causes glare when driving at night?
Night driving glare has seven common causes: uncorrected astigmatism, an outdated prescription, a wider pupil in the dark, scratched or uncoated lenses, a filmy windshield, early cataract, and dry eye. Each one makes a different pattern around a headlight, and the pattern is what tells you which one you have.
Do night driving glasses actually work?
Yellow-tinted night driving glasses do not have research behind them. In a 2019 JAMA Ophthalmology driving-simulator study, yellow-lens glasses did not improve pedestrian detection at night and did not reduce the effect of oncoming headlight glare. The tint also cuts the total amount of light reaching your eye, which is the opposite of what you want after dark.
Why do headlights look like starbursts?
Streaks and spikes around a headlight usually mean uncorrected or under-corrected astigmatism. An astigmatic eye does not bring a point of light to a point. It stretches it into a line in one direction, so a bright pinpoint in a dark field reads as a streak or a cross. The tell is that the spikes point the same way every night and tilt when you tilt your head.
Are halos around lights at night serious?
Halos are worth an eye exam. The Canadian Association of Optometrists lists halos or ghost images, increased sensitivity to light and glare including oncoming headlights, and trouble with night driving among the symptoms of cataracts. A halo can also come from an unstable tear film, which clears for a second or two when you blink. If blinking changes nothing and it has built up over months, book an exam.
Can new glasses fix night driving glare?
Sometimes. New lenses fix an out-of-date prescription, missing astigmatism correction, scratched lenses and missing anti-reflective coating. They cannot fix a filmy windshield, a cataract or dry eye, because in those cases the problem is not in the lens. That is why the first step is working out which cause you have.
Does anti-reflective coating help with night driving?
It helps with one specific part of the problem. Bare lens surfaces reflect some of the light that hits them, and those reflections bounce inside the lens and appear as faint second copies of a headlight. The coating cuts those reflections, so ghost images fade. It does not change how your eye focuses light, so it will not fix an out-of-date prescription.
Should I wear polarised or Transitions lenses for night driving?
Neither is a night lens. Polarised lenses are tinted sun lenses built for daytime reflected glare off snow and water, and they take away light you need after dark. Photochromic lenses such as Transitions are clear at night, so they stay out of the way, but being clear also means they do nothing about headlight glare.
How much is an eye exam in Edmonton if glare is my only symptom?
A comprehensive adult eye exam at Charm Optical is $99 when it is not covered by AHCIP. AHCIP covers an eye exam for Albertans under 19 and 65 and older, and for certain medical conditions. Eye exams are by appointment. Glare that has changed over the past year is a better reason to have your eyes measured than to buy a tint.
Book an eye exam
Find out which of the seven it is
Five of the seven causes need something measured, and a refraction settles three of them in one appointment. Bring the glasses you drive in, and tell us which plate on this page matches your windshield — that is genuinely useful information for the person examining your eyes. We are at 5035 Ellerslie Road SW in south Edmonton, by appointment.
A comprehensive adult eye exam is $99 when it is not covered by AHCIP. Prefer to talk it through first? Call (780) 490-0090. Rings around lights? Start with our cataracts page.
Sources. Daylight figures computed from sunrise and sunset times for 53.5461° N, 113.4938° W supplied by the U.S. Naval Observatory, Astronomical Applications Department, queried 24 July 2026. Hwang, Tuccar-Burak and Peli, Comparison of Pedestrian Detection With and Without Yellow-Lens Glasses During Simulated Night Driving With and Without Headlight Glare, JAMA Ophthalmology 2019;137(10):1147–1153 — 22 participants, three commercial yellow-lens products, eight conditions each. Manda, Castle, Hwang and Peli, Impact of Headlight Glare on Pedestrian Detection with Unilateral Cataract, Proceedings of the International Driving Symposium on Human Factors in Driver Assessment, 2019. Canadian Association of Optometrists eye health library entries for cataracts and astigmatism. Blurred vision among dry eye symptoms: Golden, Meyer, Zeppieri and Patel, Dry Eye Syndrome, StatPearls. Charm Optical exam price from /pages/glasses-deal; product prices re-pulled from live product data on 24 July 2026.