A scratched visor is the single largest glare problem most riders have, and it is invisible until the sun is low. Fine scratches do not block light — they scatter it, so every headlight and every low sun turns into a veil across the whole field of view rather than a point you can look past. A visor that looks acceptable at noon can be unusable at 18:00 in October. Replacing it costs less than any anti-glare accessory and works better than all of them.
This is general riding information, not medical advice. Eye pain, sudden vision changes, floaters or flashes, or glare that has been getting steadily worse over months are reasons to see an optometrist or doctor rather than to buy a darker visor.
Two kinds of glare, and only one of them is about comfort
| Source | What it does | Works | Does not work |
|---|---|---|---|
| Low sun directly ahead | Saturates the retina; you lose detail across the whole scene | Slowing down, an internal sun visor, using the peak or your hand, changing route timing | A darker visor alone, which cuts the road as much as the sun |
| Scratched or hazed visor | Scatters any bright light into a uniform veil, killing contrast | Replacing the visor; correct cleaning technique | Polishing compounds, which usually add fine scratches |
| Wet road with sun or headlights behind it | Specular reflection from the water film hides surface detail and markings | Position change to alter the reflection angle, slowing, more following distance | Tinted visors, which hide the road surface too |
| Oncoming headlights at night | Disability glare — reduced contrast for seconds afterwards | Clean clear visor, looking to the nearside edge line, clean glasses | Any tint at night; illegal in some places and dangerous everywhere |
| Fogging and condensation | Diffuses all light; identical effect to scratching but reversible | Anti-fog insert, ventilation, breath guard | Cracking the visor open in rain, which trades fog for water |
The distinction that matters is between discomfort glare, which makes you squint, and disability glare, which measurably reduces what you can see. A rider can adapt to the first. The second removes information regardless of how tough you are, and it gets worse with any medium that scatters light — which brings it back to the state of the visor.
The visor rules are stricter than most riders realise
In the UK, eye protection is regulated. The Motor Cycles (Eye Protectors) Regulations 1999 prescribe which types of eye protector are authorised: those conforming to Grade X of British Standard BS 4110:1979, or Grades XA, YA or ZA of the same standard as amended, marked with the standard and grade and an approved certification mark; those complying with the European personal protective equipment directive; or, for eye protectors first used before 1 April 1989 with corrective lenses, ones that transmit 50 per cent or more of the light and do not fly into fragments if fractured. The relevant harmonised European standard named in the explanatory note is EN 1938:1998 for motorcycle and moped goggles.
Two practical points come out of that. First, the marking on the visor is not decoration — an unmarked dark visor bought online may not be an authorised eye protector where you ride. Second, light transmission is the property being regulated, which is why a very dark visor is a legal question as well as a safety one.
The UK Highway Code adds the behavioural rules. Rule 93 says to slow down and if necessary stop when dazzled by bright sunlight, and Rule 94 says not to use tinted glasses, lenses or visors at night or in poor visibility if they restrict vision. Rule 92 sets the eyesight standard: being able to read a number plate in good daylight at 20 metres, with glasses or contact lenses worn at all times while driving if you need them for that.
Rule 93 is the one riders ignore. Slowing down for sun is treated as an admission of weakness, and it is the only thing that reliably works when you are riding due west at sunset on an unfamiliar road.
Setting up so glare does not decide your day
- Carry a clear visor whenever you carry a dark one. A day that started at 10:00 in sunshine ends at 20:00 in the dark, and swapping takes two minutes at a fuel stop. Riders who own only a tinted visor end up riding home behind it.
- Treat the visor as a consumable. Once fine scratches show against a low sun, it is finished. Clean it with plenty of water first to float the grit off, then a soft cloth — dry-wiping a dusty visor is how the scratches got there. The full method is in helmet cleaning and care.
- Use the internal sun visor for the sun and the outer visor for the weather. A drop-down internal visor can be retracted instantly when you enter a tunnel, which no external tint can match.
- Know the lag on photochromic visors. They darken and clear over tens of seconds to minutes, not instantly, and cold slows the change. Riding into a long tunnel on a bright day means a period of riding dark.
- Keep prescription lenses clean and current. A scratched spectacle lens scatters light exactly like a scratched visor, and inside a helmet it sits closer to the eye. Fitment and frame choice inside a lid are covered in helmets for glasses wearers.
- Sort fogging properly rather than by opening the visor. An anti-fog insert plus vent management removes the problem; a cracked visor in the rain replaces it with water on the inside. See visors and anti-fog.
Dry, tired eyes are a separate problem
Eye strain on a bike is not only about brightness. Airflow through a vented helmet dries the tear film, and a dry cornea scatters light — the same contrast loss as a hazed visor, generated inside your own eye. Riders often notice it as vision that gets steadily worse over a long day and clears after an hour off the bike.
What contributes:
- Air leaking around a poorly sealed visor or through a chin vent aimed upward.
- Contact lenses, which tolerate wind far worse than spectacles and can dry out enough to blur.
- Reduced blink rate during long periods of fixed attention, which is well described in screen work and applies to a fixed forward stare on a motorway.
- Low humidity at altitude or in dry climates.
- Some medicines, including several antihistamines, which reduce tear production.
The countermeasures are unglamorous: a visor that seals, deliberate blinking, a stop where you take the helmet off, and lubricating drops if your clinician thinks they are appropriate for you. If dryness is persistent rather than ride-related, it is worth raising with an optometrist rather than managing indefinitely.
When glare is telling you something about your eyes
Glare sensitivity that increases over months, headlights that develop halos, or night riding that has quietly become intolerable are not visor problems. A 2026 narrative review in Current Treatment Options in Neurology on visual impairment and driving in older adults makes the relevant point: functions beyond high-contrast visual acuity — particularly visual field sensitivity, contrast sensitivity and visual processing speed — are associated with driving performance and crash risk, and driving safety cannot be adequately assessed by a single visual measure. The record is on Europe PMC.
That matters for riders because the standard eye test is an acuity test. Passing the number plate check at 20 metres says nothing about your contrast sensitivity in the rain at dusk, which is closer to the thing that keeps you alive. The US National Eye Institute's guidance on keeping your eyes healthy recommends comprehensive dilated eye exams as the way to catch conditions that have no early symptoms. Ask specifically about glare and night vision when you go, because those complaints do not surface in a routine acuity check unless you raise them.
See a clinician promptly for sudden vision loss, new floaters or flashes, eye pain, double vision, or a rapid change in one eye. Riders over 50 should also read riding as an older motorcyclist, where the vision question sits alongside the others.
One equipment note: instrument and navigation displays are part of the glare picture. A screen you have to shade with a hand in bright sun is a screen you will look at for longer, and longer glances are the expensive ones. A display designed for outdoor legibility reduces the time your eyes spend off the road, which is the real currency here. Conspicuity works on the same contrast logic in the other direction, covered in what the evidence says about high visibility gear.
Frequently asked questions
Can I ride at night with a tinted visor?
The UK Highway Code Rule 94 says not to use tinted glasses, lenses or visors at night or in poor visibility if they restrict vision, and eye protectors are separately regulated by light transmission. Beyond the legal position, a tint removes contrast exactly when you have least of it.
Are photochromic visors worth it?
They remove the swap-over problem and suit riders whose day spans changing light. The trades are cost, a transition that takes tens of seconds rather than being instant, slower change in cold weather, and a limited service life compared with a plain visor.
Why does my vision get blurry late in a long ride?
Most often a dried tear film from airflow through the helmet, made worse by contact lenses and a reduced blink rate. It typically clears within an hour of stopping. If it does not clear, or if it happens on short rides too, get your eyes checked.
Do polarised sunglasses help under a helmet?
They cut reflected glare off wet roads well, which is their strength. The downsides are that some instrument and phone screens go dark or patchy through polarised lenses, and that any glasses under a helmet must fit without pressure points or arms that lift the lining away from your head.
How often should riders get their eyes tested?
Follow your national guidance and your optometrist's advice for your age and history rather than a rule of thumb, and go sooner if glare, night vision or contrast in poor weather have changed. Tell the tester you ride — the questions worth asking are about contrast and glare, not just the letters on the chart.
