Myth check
Bilberry and Night Vision: Where the Pilot Story Came From, and What Trials Found
Bilberry has not been shown to improve night vision. The most rigorous trials found no benefit in healthy people, and the World War II story of pilots eating bilberry jam may have been a myth. Zeaxan uses bilberry leaf powder, which is not what those trials tested, and the NIH says bilberry leaves may be unsafe in high doses.
Written by the Zeaxan editorial teamUpdated · 7 min read
The legend
Did bilberry jam really help WWII pilots see at night?
Probably not. The NIH's complementary health center says the World War II story of British pilots eating bilberry jam to see better at night may have been a myth or a hoax (NCCIH, bilberry).
The story still shows up on supplement labels and ads. It is easy to remember, which is part of why it lasted. A good story, though, is not a trial.
From story to study
How did the bilberry night vision idea get tested?
Researchers ran trials of bilberry extracts, and a 2004 review pulled them together. The more carefully a trial was run, the less benefit it found (Canter and Ernst, 2004).
- World War II
The pilot and bilberry jam story begins. NCCIH now says it may have been a myth (NCCIH, bilberry).
- Later trials
Researchers test bilberry anthocyanosides, compounds in bilberry extracts, for night vision. Thirty trials are published, 12 with a placebo group (Canter and Ernst, 2004).
- 2004
A systematic review finds the four most recent randomized trials were all negative (Canter and Ernst, 2004).
- Today
NCCIH says the most rigorous studies have not found bilberry effective for night vision in healthy people (NCCIH, bilberry).
The numbers
What do the best studies say about bilberry and night vision?
They found no benefit for normal night vision. The 2004 review concluded the idea is not supported by rigorous evidence (Canter and Ernst, 2004).
| Trials reviewed | 30 |
|---|---|
| With a placebo group | 12 |
| What was tested | Anthocyanosides of bilberry (Vaccinium myrtillus) |
| Most recent randomized trials | 4, all negative |
| Conclusion | Improved normal night vision is not supported by rigorous evidence |
Placebo-controlled trials matter here. A group taking a dummy pill shows whether a change came from the extract or from people expecting one.
Read the label
Is bilberry leaf the same as the bilberry extract in studies?
No. The night-vision trials tested bilberry anthocyanoside extracts. Zeaxan lists "Bilberry Leaf Powder", 6th of 11 in its 600 mg blend, with no amount printed (21 CFR 101.36).
| Label name | Bilberry Leaf Powder |
|---|---|
| What it is | Vaccinium myrtillus leaf |
| Form | Leaf powder |
| Place in the blend | 6 of 11 (heaviest first) |
| Amount per 2 capsules | Not published (listed 6th) |
| Amount used in research | Night-vision trials tested bilberry anthocyanoside extracts, not leaf powder |
| Strength of evidence | Not supported for night vision |
| Why it is in the formula | The herb behind an old pilot story about night vision |
| Main caution | NCCIH says bilberry leaves may be unsafe in high doses or for long periods. |
So even the weak trial data does not describe what is in this capsule. NCCIH also says bilberry leaves may be unsafe in high doses or when taken for long periods (NCCIH, bilberry). More in our bilberry profile.
Try Zeaxan for 90 days2 capsules a day · 3 bottles per pack · today's price on the listing
See today's priceWhere it ranks
Where does bilberry rank among eye habits with evidence?
Near the bottom. Each bar shows how much published evidence supports the option.
Regular eye exams
StrongA baseline exam by age 40 and every 1-2 years after 65 catches problems such as glaucoma, which often has no early symptoms. (AAO, 2021) (NEI, glaucoma)
Not smoking
StrongSmokers are about twice as likely to get AMD as nonsmokers. (AAO, 2021)
Yearly dilated exam if you have diabetes
StrongDiabetic eye damage usually has no symptoms early on. (NEI, diabetic eye)
AREDS2 formula, if you already have intermediate AMD
StrongLowered the risk of advanced AMD by about 25% over 5 years in people with intermediate or late AMD. (NEI, AREDS2) (Cochrane, 2023)
20-20-20 screen breaks
Helps comfortEvery 20 minutes, look 20 feet away for 20 seconds. Eases tired eyes; strain causes no lasting damage. (AAO, eye strain)
Leafy greens and eggs
Food firstFood gives about 1-2 mg of lutein and zeaxanthin a day; no official daily target exists. (Wilson et al., 2021)
Eye vitamins if you do not have AMD
No benefitSupplements cannot prevent AMD, and AREDS showed no benefit without AMD or with early AMD. (NEI, 2020) (Cochrane, 2017)
Bilberry for night vision
Not supportedThe most rigorous trials found no improvement in normal night vision. (Canter and Ernst, 2004) (NCCIH, bilberry)
Zeaxan itself
No trialsNo published trial has tested this blend, and its amounts are not published. (FTC, 2022)
Bar length shows how much published evidence supports each option for keeping your eyes healthy, based on the eye institutes, reviews and studies linked here. A reading aid, not a score from any one source.
A practical step
What should you do if seeing at night is getting harder?
Book an eye exam rather than buying a supplement. Changes in how you see at night have causes an eye doctor can look for.
Cataracts are one example. More than half of Americans 80 or older have cataracts or have had surgery for them, and surgery is the only way to remove one (NEI, cataracts). Glaucoma often has no early symptoms, so exams catch what you cannot feel (NEI, glaucoma).
The American Academy of Ophthalmology advises an exam by age 40, and every one to two years after 65 (AAO, 2021). See our eye health guide.
Buyer's guide
How can you spot a weak eye supplement claim?
Look for a randomized, controlled human trial of the product itself. The FTC says health claims generally need that level of evidence (FTC, 2022).
- An old story or a famous user in place of a study is a warning sign. FDA lists personal testimonials among its six health-fraud tip-offs (FDA, health fraud).
- "All natural" is not proof of safety or effect (NCCIH, 2019).
- Claims to restore lost vision have drawn FTC action before (FTC, 2005).
Zeaxan's panel says "Support Clear & Healthy Sight". We list each seller claim beside the evidence on our benefits page, and our supplement buying guide has a full checklist.
FAQ
Bilberry questions
Is bilberry good for night vision?
The evidence says no. The most rigorous studies have not found bilberry effective for improving night vision in healthy people (NCCIH, bilberry), and a review of 30 trials found the four most recent randomized trials were all negative (Canter and Ernst, 2004). An eye exam is the better step if night vision worries you.
Is the WWII bilberry pilot story true?
It may not be. NCCIH says the story of British pilots eating bilberry jam to see better at night during World War II may have been a myth or a hoax (NCCIH, bilberry). Either way, later controlled trials did not find better night vision in healthy people (Canter and Ernst, 2004).
Is bilberry leaf safe to take every day?
It may not be safe in high doses or over long periods, according to NCCIH (NCCIH, bilberry). Zeaxan uses bilberry leaf powder but does not print the amount, so you cannot judge the dose yourself. Ask your doctor or pharmacist before taking any bilberry leaf product long-term.
Is the bilberry in Zeaxan the kind used in night vision studies?
No. Zeaxan lists "Bilberry Leaf Powder", while the night-vision trials tested bilberry anthocyanoside extracts (Canter and Ernst, 2004). The leaf powder is 6th of 11 ingredients in a 600 mg blend, and its amount is not printed (21 CFR 101.36). Even the tested extracts did not improve normal night vision.
What are anthocyanosides in bilberry?
They are the bilberry compounds that night-vision trials tested, usually as extracts. A 2004 review of those trials concluded that the idea they improve normal night vision is not supported by rigorous evidence (Canter and Ernst, 2004). Zeaxan's label lists bilberry leaf powder, not an anthocyanoside extract.
Why do eye supplements still include bilberry?
Zeaxan's label does not explain why its blend includes bilberry leaf. The night-vision story is old and well known, and FDA warns that stories and testimonials are a common sign of weak health claims (FDA, health fraud). Judge the product by trials, not by tradition.
What should I do if I struggle to see when driving at night?
Book an eye exam. An eye doctor can check for causes such as cataracts, which are very common with age and can only be removed by surgery (NEI, cataracts). Do not wait for a supplement to help, and do not drive at night if you feel unsafe.
Who wrote this
Written and reviewed by
Plain-language pages built from the bottle label and linked medical sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by an authorized U.S. retailer, not by the manufacturer. We are paid a commission when you buy through our order links.
Keep reading
More about Zeaxan
Bilberry
Bilberry leaf in Zeaxan: the pilot legend, what placebo-controlled trials found, and why leaf is not the studied form.
Read moreBenefits
Each Zeaxan benefit claim in the seller's words, set next to what research actually shows.
Read more
Choosing a supplement
Read a label, know the AREDS2 doses, spot red flags and know what to ask your eye doctor before you buy.
Read moreUSA authorized Zeaxan retailer
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