The Short Answer
Night driving is often the first thing people give up as their eyes age, and it usually happens gradually enough that they notice the avoidance before they notice the cause. Oncoming headlights flare into starbursts. Street signs arrive later than they used to. The gap between leaving a lit gas station and seeing the road again stretches uncomfortably long.
These are not vague complaints. Each maps to a specific, measurable optical change, and knowing which one is yours matters, because some are normal aging, some are treatable conditions, and one or two are emergencies. The supplement aisle treats them all as a single problem called "night vision" with a single answer. The eye does not work that way.
What Physically Changes in an Aging Eye
The pupil admits less light
Pupil size decreases with age, a change sometimes called senile miosis. A smaller pupil in dim conditions means less light reaching the retina, and the difference between a young adult's dark-adapted pupil and an older adult's is substantial. Nothing is wrong; there is simply less light to work with.
The lens yellows and scatters
The crystalline lens gradually becomes denser and more yellow, absorbing more light on the way through and scattering what passes. Scatter is the key word for night driving: it is why a headlight stops being a point and becomes a glare that washes out everything near it. Early cataract is an acceleration of this same process, and glare at night is often its first noticeable symptom, well before anyone would call the vision cloudy.
Dark adaptation slows
Rods, the photoreceptors responsible for low-light vision, depend on rhodopsin, a pigment that is bleached by light and must regenerate before full sensitivity returns. That regeneration slows with age. Practically, this is the reason for the uncomfortable interval after passing bright lights: a younger eye recovers in a few minutes, an older one takes considerably longer, and during that window a dark road really is less visible.
Contrast sensitivity declines
This is the change most often missed, because standard eye charts do not measure it. Contrast sensitivity is the ability to distinguish an object from a background of similar brightness: a grey pedestrian against grey asphalt at dusk, a kerb, a pothole. Someone can read the 20/20 line and still have meaningfully reduced contrast sensitivity, which is exactly the deficit that matters at night.
Reading Your Own Symptoms
| What you notice | Common explanation | Worth an exam? |
|---|---|---|
| Gradual dimming, needing more light to read | Smaller pupil, denser lens | Routine exam is enough |
| Glare and starbursts from headlights | Light scatter, often early cataract | Yes, worth checking |
| Halos around lights | Cataract, dry eye, corneal changes | Yes, and urgently if with pain or redness |
| Long recovery after bright lights | Slowed dark adaptation | Mention it at your next exam |
| Prescription changing quickly | Lens changes, sometimes blood sugar | Yes, and ask about glucose |
| Losing peripheral awareness at night | Possible glaucoma or retinal disease | Yes, promptly |
| Sudden change, flashes, floaters, curtain | Possible retinal detachment | Emergency, same day |
Two rows deserve emphasis. A prescription that keeps strengthening unusually fast is sometimes a lens change from fluctuating blood sugar, which is worth mentioning to a doctor as well as an optometrist. And halos accompanied by eye pain, redness, nausea, or vision loss can indicate acute angle-closure glaucoma, which is a genuine emergency rather than an inconvenience.
Conditions Worth Ruling Out
Most declining night vision is ordinary aging plus cataract. But three conditions are common enough and consequential enough to be the reason exams matter more after 60, not less.
Cataract is the most likely explanation for glare-dominant complaints, and it is worth knowing that it is among the most successfully treated conditions in medicine. People often delay for years, adapting their lives around it, when the treatment is routine and the improvement is often dramatic.
Glaucoma damages peripheral vision first and painlessly, which is why it is called the silent thief of sight. It is detected by examination rather than by symptoms, which is the entire argument for regular exams.
Age-related macular degeneration affects central vision, and one of its earlier functional signs is exactly this: needing more light and adapting slowly to darkness. The National Eye Institute's material on AMD covers what it is and how it is monitored.
Diabetic retinopathy also belongs on the list for anyone with diabetes, since it is a leading cause of vision loss and is managed far better when caught early.
What Actually Helps
The useful measures divide into two groups: things that address the eye, and things that address the driving.
Get the prescription and the lenses right
An outdated prescription makes everything worse at night, when the eye has the least margin. Anti-reflective coating on spectacle lenses genuinely reduces the internal reflections that contribute to glare, and it is one of the few optical add-ons with a clear rationale. Keeping both spectacles and the windscreen properly clean matters more than it sounds: a filmed windscreen scatters light in exactly the way an aging lens already does, and the two compound.
Skip the yellow "night driving" glasses
They are widely sold and the evidence does not support them. Yellow-tinted lenses reduce the total light entering the eye, which is the opposite of what a light-starved eye needs at night, and controlled testing has not shown improved detection of pedestrians or hazards. They may increase subjective comfort while reducing actual visibility.
Adjust how you drive
Look toward the right edge of the lane rather than at oncoming headlights, which reduces the bleaching that then requires recovery. Increase following distance to buy reaction time. Dim the dashboard so the eye is not adapting to a bright interior. Prefer familiar, well-lit routes at night. These are pedestrian suggestions that address the actual mechanism, which most products do not.
Eat for the eye, sensibly
Vitamin A deficiency genuinely causes night blindness, and this is well established. It is also rare in well-nourished populations, and correcting a deficiency you do not have does nothing. Beyond that, the dietary pattern with the most support for eye health is unsurprising: leafy greens (lutein and zeaxanthin), fish (omega-3), and colourful vegetables, within an overall Mediterranean-style pattern. Not smoking is the single largest modifiable risk factor for both AMD and cataract.
Where an Eye Supplement Fits
This category deserves a careful distinction, because one part of it has real evidence and the rest borrows the credibility.
The AREDS2 formulation (specific doses of vitamins C and E, zinc, copper, lutein, and zeaxanthin) has genuine trial evidence for one narrow purpose: slowing progression in people who already have intermediate or advanced age-related macular degeneration. That is a meaningful, well-documented finding. What AREDS2 did not show is equally important: it did not improve vision in healthy eyes, did not prevent AMD from developing, and did not improve night vision. The National Eye Institute's summary of AREDS and AREDS2 is explicit about the population it applies to.
The other common ingredients are weaker. Bilberry's night-vision reputation traces back to the RAF folklore, generally understood as wartime cover for radar, and controlled studies have not established a benefit in people with normal vitamin A status. Saffron has small trials in AMD with some encouraging signals and small samples. Turmeric and pepper extracts have preliminary and mostly indirect data for the eye.
iGenics is one commercial example in this category, combining several of these botanicals in a formula positioned around vision and eye protection. The distinction that matters: the research above concerns individual ingredients, in specific populations and doses that mostly do not match this product, and we found no independent trials of the finished formula, so the available evidence is insufficient to say whether it affects night vision at all. No supplement has been shown to improve night vision in people who are not deficient in vitamin A, and the most consequential thing a supplement can do in this space is delay an eye exam that would find a treatable cataract or a silent glaucoma. Anything here belongs alongside an exam and the optical measures above, not instead of them, and is worth mentioning to your eye doctor, particularly the high-dose zinc formulations. Our full iGenics review covers the ingredients, pricing, and refund terms.
How Often to Get Examined
Because glaucoma is painless and AMD begins subtly, examination frequency is the practical centre of eye care after 60. Ophthalmology guidance generally suggests a comprehensive exam every one to two years for adults over 65, and more often with diabetes, a family history of glaucoma, or an existing condition being monitored. A dilated exam is what allows the retina and optic nerve to be seen properly; a vision test at the optician's counter is not the same thing.
Some situations should not wait for the schedule: sudden vision change in one eye, a shower of new floaters, flashes of light, a curtain or shadow moving across the field, eye pain with redness and nausea, or double vision. These are same-day concerns, and several of them are the difference between preserved and lost vision.
Frequently Asked Questions
Why is my night vision getting worse as I age?
Several optical changes stack up: the pupil admits less light, the lens yellows and scatters more light, and dark adaptation slows because the retina takes longer to regenerate the pigment rods need. Contrast sensitivity also declines. These are normal age-related changes, though cataracts and retinal conditions can accelerate them, which is why an exam is worthwhile.
What causes halos around lights at night?
Halos usually come from light scattering as it passes through the eye. Early cataract is a common cause, and so are dry eye disrupting the tear film, corneal changes, and, in some people, previous refractive surgery. New or worsening halos deserve an eye exam, particularly if they come with pain, redness, or vision loss, which can indicate acute glaucoma and is an emergency.
Did pilots really use bilberry for night vision?
The story about RAF pilots eating bilberry jam is a well-known piece of folklore, generally understood as wartime misdirection to conceal the use of radar. Controlled studies have not established that bilberry improves night vision in people with normal vitamin A status. It is a good example of a marketing story outliving its evidence.
Do eye supplements improve night vision?
No supplement has been shown to improve night vision in people who are not deficient in vitamin A. The AREDS2 formula has good evidence for a specific purpose, slowing progression in intermediate or advanced age-related macular degeneration, but it was not shown to improve vision in healthy eyes or to prevent the disease from developing.
Should older drivers stop driving at night?
Not automatically. Many people drive safely at night well into later life, particularly with a current prescription, treated cataracts, and adjusted habits. The honest questions are whether you are having near-misses, whether passengers seem uneasy, and whether an eye exam has ruled out a treatable cause. A functional assessment is a better basis for that decision than a birthday.
The Bottom Line
Night vision declines for reasons that are optical and specific: a smaller pupil, a denser and more scattering lens, slower dark adaptation, and reduced contrast sensitivity. Glare and halos in particular often point to early cataract, which is among the most treatable conditions in medicine, and the peripheral and central changes that matter most (glaucoma, macular degeneration) are found by examination rather than by symptoms. The measures that help are an up-to-date prescription with anti-reflective coating, clean glass, adjusted driving habits, not smoking, and skipping the yellow night-driving glasses the evidence does not support. Supplements have one well-documented role in this space, the AREDS2 formula for people who already have intermediate or advanced AMD, and that is not the same as improving night vision in a healthy eye. If the road is getting harder to see, the appointment is worth more than the bottle.