Alcohol and vision: what the studies show, and where they disagree

On alcohol and the eyes, the literature is abundant, and it contradicts itself. Cohorts of several hundred thousand people find fewer cataract operations among drinkers; studies of similar scale conducted elsewhere find more. For AMD, the association appears for early forms and vanishes for advanced ones. This disorder is not an accident: it says something precise about what an observational study can establish. Here is what is solid, what is not, and the one situation in which alcohol genuinely threatens the optic nerve.

UNDERSTANDING

Does alcohol damage the eyes?

Two questions need to be kept separate: they have neither the same answer nor the same level of evidence. The first: what does alcohol do to vision within the hour that follows? This can be tested in the laboratory, on the same people before and after, with a breathalyser to measure exposure; the results are reproducible. The second: does drinking for thirty years change the risk of cataracts, AMD or glaucoma? This can only be tested by observation.

A general review of alcohol-related eye disorders distinguishes four situations with little in common: acute intoxication, whose main sign is an abnormality of eye movements; methanol poisoning, which destroys the optic nerve; prenatal exposure; and the associations described in chronic drinkers. Grouping them under a single heading creates an impression of continuity that does not exist.

One point of definition first, because it governs how every figure that follows should be read. In the epidemiological literature, a standard drink is roughly 10 g of pure alcohol, and the threshold for so-called high consumption is often set above two drinks a day. What one study calls “moderate”, another calls “high”: comparing conclusions without checking the definitions is the surest way to get it wrong.

Why do two serious studies reach opposite conclusions?

Because neither of them can isolate alcohol from the rest of the lives of the people who drink it. An observational study compares people who drink with people who do not, and these two groups differ by far more than alcohol alone: tobacco, diet, income, physical activity. Each statistical adjustment corrects part of that gap and leaves another part uncorrected.

Tobacco is the main confounder, and its share can be demonstrated. In the 2015 meta-analysis on alcohol and cataracts, adjusting for smoking attenuates the association. In a study comparing 200 eyes of dependent patients with 200 control eyes, thinning of the retinal nerve fibre layer tracked the nicotine dependence score, but not the alcohol consumption score. What is attributed to alcohol often belongs to tobacco.

The comparison group raises a separate problem. Non-drinkers are not a homogeneous population: some have never drunk, others have stopped, sometimes for a health reason that also affects the eyes. The authors of the largest British cohort say as much in their conclusion: they cannot rule out residual confounding, and they decline to describe their association as causal.

Hence the value of a method that bypasses lifestyle altogether: Mendelian randomisation. It relies on genetic variants that influence consumption, and the random assignment of genes at conception depends on neither income nor tobacco. Applied to cataracts using two large genetic databases, it finds no effect of alcohol.

One last limitation, the most mundane of all: consumption is self-reported by participants, often by means of a dietary questionnaire completed just once, years before the disease develops. A 2025 review devoted to lifestyle in glaucoma makes this its main criticism of the literature in the field. Bearing this in mind stops a risk ratio being read as a prediction.

DRIVING

After two drinks, what exactly deteriorates?

Two measurable things: contrast sensitivity and light scatter inside the eye. A team in Granada put 40 volunteers through a baseline session, then two further sessions after drinking 300 ml and then 450 ml of red wine, with breath alcohol measured each time. Both parameters deteriorated, and so did simulator driving performance, especially at the higher dose.

Contrast sensitivity is not visual acuity. You can read the 20/20 line on a black-and-white chart and still struggle to make out a pedestrian in a grey coat in the rain: it is this second kind of performance that falls away. A study using a rapid measurement method finds the decline as early as thirty minutes after a moderate dose. Depth perception is also affected at moderate blood alcohol levels.

One result deserves attention precisely because it contradicts intuition. Among 31 drivers tested at two doses, those given the lower dose exceeded speed limits more often than those given the higher one: at a low dose, the driver does not yet perceive the impairment and does not compensate for it. Another team finds the same dissociation, with visual function already impaired at the low dose.

One methodological nuance, to finish. A study measured contrast sensitivity in the same observers using both classical psychophysics and signal detection theory: the first showed a raised threshold, the second no loss of sensitivity at all, but a decision criterion that had become more cautious. Part of what is measured as a sensory impairment is actually a change in judgement.

The impact is not confined to states of drunkenness. In young adults who drink alcohol weekly and were examined with no recent intake at all, colour discrimination was impaired on two separate tests, while contrast sensitivity remained normal: subclinical losses that the person concerned does not notice.

SURFACE

Does alcohol dry out the eyes?

A meta-analysis of factors associated with dry eye disease finds an odds ratio of 1.18 for alcohol consumption, the same order of magnitude as for tobacco. The TFOS report devoted to lifestyle and the ocular surface lists alcohol among the factors associated with tear film instability. So far, the picture is consistent.

The largest available study immediately complicates this picture. Among 77,145 participants in a Dutch cohort, alcohol consumption increased the risk of symptomatic dryness in women, with an odds ratio of 1.095, but not in men; and in men who drank, each additional 10 g per day was even very slightly protective. The authors explicitly urge caution in interpreting this last finding.

This divergence between men and women recurs elsewhere in this article, for intraocular pressure as for glaucoma. It is a reminder that an average result calculated across a mixed population may describe no one in particular. In practice, dry eye is treated for what it is; alcohol is not its main cause.

PRESSURE

Does alcohol raise eye pressure?

Modestly, and it has been measured. In a Canadian study of 30,097 adults aged 45 to 85, daily drinkers had higher intraocular pressure than people who had never drunk, a difference of 0.45 mmHg; each additional five drinks per week added 0.20 mmHg. The effect was more marked in those with a high genetic risk score for glaucoma.

The same study, looking at 1,525 reported cases, finds no association between alcohol consumption and glaucoma itself. This is the point to hold onto: slightly higher pressure is not a disease. A difference of 0.45 mmHg remains well below the threshold that would prompt a change in treatment, and below the spontaneous variation seen in a single person over the course of a day.

Elsewhere, the results diverge again. A Japanese case-control study of 3,207 patients with glaucoma and an equal number of matched controls finds an odds ratio of 1.40 for near-daily consumption, but only in men: in women, neither frequency, nor quantity, nor cumulative lifetime consumption was associated with the disease.

A German review devoted to everyday consumer products even states the opposite of what intuition would suggest: small quantities of alcohol are said to lower raised intraocular pressure, without any change in the prevalence of glaucoma. Concluding from all this that one ought to drink for the sake of eye pressure would be absurd. Concluding that alcohol is an established risk factor for glaucoma would be just as absurd.

LENS

Does alcohol cause cataracts?

This is the question on which disagreement is sharpest. Two meta-analyses published a year apart do not say the same thing. One, covering ten studies, finds a relative risk of 1.26 above 20 g of alcohol per day. The other, restricted to seven prospective cohorts and 119,706 participants, concludes there is no excess risk, whatever the type of cataract.

The large cohorts settle nothing further. In the UK Biobank and in the EPIC-Norfolk cohort, comprising 469,387 and 23,162 participants respectively, drinkers underwent cataract surgery less often than non-drinkers, with adjusted risk ratios of 0.89 and 0.90. The authors themselves state that whether this link is causal remains to be determined.

By contrast, a Japanese study comparing 14,861 patients operated on for cataracts with 14,861 matched controls describes a positive dose-effect relationship, with an odds ratio of 1.30 for consumption on four to seven days a week. In a Chinese cohort of more than 512,000 adults, cataracts are among the diseases associated with consumption in men, with a risk ratio of 1.21 per 280 g per week.

How can this be resolved? Through methods that do not depend on self-reported habits. A two-sample Mendelian randomisation study, conducted on two databases totalling nearly 60,000 cataract cases, finds no effect of genetically determined alcohol consumption, nor of tobacco or type 2 diabetes. And an analysis of the UK Biobank covering 199,415 disease-free participants identifies only tobacco and a sedentary lifestyle among five lifestyle factors examined.

The state of the question is therefore this: heavy, prolonged consumption is associated with excess cataracts in several populations, the association is weak, it is not found everywhere, and genetic approaches do not confirm it. One last study shows just how much the way a question is framed determines the answer: by comparing not quantities but timing, it describes a favourable effect from drinking with meals.

MACULA

And what about AMD?

The association exists for early forms and disappears for advanced ones, which is itself informative. A dose-response meta-analysis covering seven studies, 4,566 cases of early AMD and 440 cases of advanced disease, finds a significant effect for early disease at moderate consumption, at 1.19, and at high consumption, at 1.24, but nothing for advanced disease.

An independent meta-analysis, devoted to food groups and covering 211,676 people and 7,154 cases, finds a relative risk of 1.20 for the highest level of alcohol consumption. Two different methods, a similar order of magnitude: this is the most consistent result in this entire article, and it concerns the stage at which vision is not yet under threat.

Even so, it needs to be put in perspective. A recent review of risk factors for AMD identifies age, male sex, tobacco, hypertension and diabetes, with tobacco carrying an odds ratio of 1.86. A factor sitting around 1.2, confined to early forms and with no demonstrated effect on the forms that cause loss of central vision, does not belong in the same category.

I have diabetes: does alcohol make my retina worse?

The available data do not show this. A meta-analysis of fifteen studies covering 37,290 participants and 12,711 cases of diabetic retinopathy finds an overall odds ratio of 0.91, which is not significant, and this result remains stable whether the underlying studies are cohorts, case-control studies or cross-sectional studies.

The authors add the caveat that matters: the effect could differ by type of diabetes and by the factors included in the adjustment, and there is no solid data on dose or on type of drink. Absence of evidence is not evidence of absence. In a patient with diabetes, what drives the course of the retina remains glycaemic control, blood pressure and how long the diabetes has been present.

OPTIC NERVE

My vision is slowly declining in both eyes and colours look dull: what could this be?

Toxic and nutritional optic neuropathy, if the context fits. This is the only chapter in this article where alcohol stops being a debatable risk factor and becomes part of the diagnosis itself. It is rare, it is serious, and its prognosis depends almost entirely on how quickly it is treated.

The clinical picture is stereotyped. The loss of vision is bilateral, symmetrical, painless, and it progresses over months rather than days. Colour vision deteriorates early, often more than acuity does. The visual field shows a central or centrocaecal scotoma, with no relative afferent pupillary defect, since both nerves are affected in the same way. And early on, the fundus looks normal: that is the diagnostic trap.

The mechanism is not a direct toxic effect of ethanol on the nerve. Heavy chronic consumption goes along with inadequate intake and impaired absorption of B-group vitamins, particularly vitamin B12 and folate. The axons of the papillomacular bundle, which have very high energy demands, give way first. Tobacco makes the picture worse in two ways: it degrades nutritional status, and it delivers cyanide, which is toxic to the optic nerve.

Treatment consists of identifying and correcting the deficiencies, and removing the toxic substances responsible. Started early, the outcome can be excellent: a 34-year-old man who presented with a sudden bilateral loss recovered his acuity completely after treatment was begun straight away. In a 40-year-old man, a heavy smoker and heavy drinker, deficient in vitamin B12 and folate, recovery remained limited. One review puts it bluntly: this neuropathy is often recognised too late.

Imaging provides objective evidence of this loss. In patients followed for alcohol and tobacco dependence, the retinal nerve fibre layer is thinner than in matched controls, particularly in the temporal sectors, the ones used by the papillomacular bundle. A case followed for one year shows the other side of the coin: after vitamin supplementation was stopped and the toxic substances resumed, acuity continued to decline.

So what should be done with all this, in practice?

Three things, and none of them is a sermon. The first concerns driving, and it is the only one where the evidence is solid enough to be held against someone: after drinking, contrast perception and glare handling deteriorate before the person notices, and the gap is greatest at low doses, the ones judged to have no consequence.

The second concerns the ophthalmological examination. Disclosing your consumption is not about being judged, it is about clinical reasoning: faced with an unexplained bilateral loss of vision, this information points towards a vitamin work-up rather than towards a series of examinations that lead nowhere.

The third is a call for caution in both directions. No one should take up drinking wine for the sake of their eyes on the grounds that a British cohort counted fewer cataract surgeries among drinkers. Nor should anyone be told that their daily glass will cost them their sight. Neither of these two claims is supported by what is actually known.

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Scientific sources

• Karimi S, Arabi A, Shahraki T. Alcohol and the eye. J Ophthalmic Vis Res. 2021;16(2):260-270. PMID 34055263
• Casares-López M, Castro-Torres JJ, Martino F, et al. Contrast sensitivity and retinal straylight after alcohol consumption: effects on driving performance. Sci Rep. 2020;10(1):13599. PMID 32788613
• Ortiz-Peregrina S, Casares-López M, Ortiz C, et al. Comparison of the effects of alcohol and cannabis on visual function and driving performance. Drug Alcohol Depend. 2022;237:109538. PMID 35717788
• Casares-López M, Castro-Torres JJ, Ortiz-Peregrina S, et al. Alcohol effects on drivers’ speed management: the influence of visual performance and road complexity. J Stud Alcohol Drugs. 2024;85(6):804-814. PMID 38647099
• Zhang P, Guo Y, Qiao Y, et al. Acute alcohol intake affects internal additive noise and the perceptual template in visual perception. Front Neurosci. 2022;16:873671. PMID 35645717
• Cavalcanti-Galdino MK, Silva JA, Mendes LC, et al. Acute effect of alcohol intake on sine-wave Cartesian and polar contrast sensitivity functions. Braz J Med Biol Res. 2014;47(4):321-327. PMID 24676473
• Timney B, Ferreira M, Matson S. A signal detection analysis of the effects of alcohol on visual contrast sensitivity. Perception. 2016;45(12):1358-1374. PMID 27388278
• Martino F, Castro-Torres JJ, Casares-López M, et al. Influence of interocular differences and alcohol consumption on binocular visual performance. Int J Environ Res Public Health. 2023;20(3):1751. PMID 36767115
• Brasil A, Castro AJ, Martins IC, et al. Colour vision impairment in young alcohol consumers. PLoS One. 2015;10(10):e0140169. PMID 26465148
• Yang K, Wu S, Ke L, et al. Association between potential factors and dry eye disease: a systematic review and meta-analysis. Medicine (Baltimore). 2024;103(52):e41019. PMID 39969375
• Magno MS, Daniel T, Morthen MK, et al. The relationship between alcohol consumption and dry eye. Ocul Surf. 2021;21:87-95. PMID 34029755
• Galor A, Britten-Jones AC, Feng Y, et al. TFOS Lifestyle: impact of lifestyle challenges on the ocular surface. Ocul Surf. 2023;28:262-303. PMID 37054911
• Grant A, Roy-Gagnon MH, Bastasic J, et al. Alcohol consumption, genetic risk, and intraocular pressure and glaucoma: the Canadian Longitudinal Study on Aging. Invest Ophthalmol Vis Sci. 2023;64(10):3. PMID 37405759
• Sano K, Terauchi R, Fukai K, et al. Association between alcohol consumption patterns and glaucoma in Japan. J Glaucoma. 2023;32(11):968-975. PMID 37748099
• Song JE, Kim JM, Lee MY, et al. Effects of consumption of alcohol on intraocular pressure: Korea National Health and Nutrition Examination Survey 2010 to 2011. Nutrients. 2020;12(8):2420. PMID 32806703
• Kim YW, Park KH. Exogenous influences on intraocular pressure. Br J Ophthalmol. 2019;103(9):1209-1216. PMID 30910873
• Huber-van der Velden KK. Influence of luxury foodstuffs on glaucoma. Klin Monbl Augenheilkd. 2017;234(2):185-190. PMID 28142165
• Hanyuda A, Tsuda S, Himori N, et al. Diet, exercise, and lifestyle in glaucoma: current evidence and future perspectives. Nutrients. 2025;17(21):3369. PMID 41228444
• Gong Y, Feng K, Yan N, et al. Different amounts of alcohol consumption and cataract: a meta-analysis. Optom Vis Sci. 2015;92(4):471-479. PMID 25785534
• Wang W, Zhang X. Alcohol intake and the risk of age-related cataracts: a meta-analysis of prospective cohort studies. PLoS One. 2014;9(9):e107820. PMID 25238065
• Chua SYL, Luben RN, Hayat S, et al. Alcohol consumption and incident cataract surgery in two large UK cohorts. Ophthalmology. 2021;128(6):837-847. PMID 33571551
• Fukai K, Terauchi R, Furuya Y, et al. Alcohol use patterns and risk of incident cataract surgery: a large scale case-control study in Japan. Sci Rep. 2022;12(1):20142. PMID 36418504
• Im PK, Wright N, Yang L, et al. Alcohol consumption and risks of more than 200 diseases in Chinese men. Nat Med. 2023;29(6):1476-1486. PMID 37291211
• Jiang C, Melles RB, Sangani P, et al. Association of behavioral and clinical risk factors with cataract: a two-sample Mendelian randomization study. Invest Ophthalmol Vis Sci. 2023;64(10):19. PMID 37459064
• Qi J, Su K, Zhang K, et al. Association of unhealthy lifestyles with cataract risk, and the mediating role of metabolic signature: analysis of the UK Biobank prospective cohort. Aging Dis. 2025;17(5):2654-2666. PMID 40768632
• Deng J, Pan L, Huang J, et al. Modifiable dietary habits, inflammatory mediation, and senile cataract: unraveling causality via Mendelian randomization. Food Sci Nutr. 2025;13(12):e71366. PMID 41416118
• Zhang J, Mitsuhashi T, Matsuo T, et al. Alcohol consumption and age-related macular degeneration: a systematic review and dose-response meta-analysis. Curr Eye Res. 2021;46(12):1900-1907. PMID 34115943
• Dinu M, Pagliai G, Casini A, Sofi F. Food groups and risk of age-related macular degeneration: a systematic review with meta-analysis. Eur J Nutr. 2019;58(5):2123-2143. PMID 29978377
• Babaker R, Alzimami L, Al Ameer A, et al. Risk factors for age-related macular degeneration: updated systematic review and meta-analysis. Medicine (Baltimore). 2025;104(8):e41599. PMID 39993131
• Chen C, Sun Z, Xu W, et al. Associations between alcohol intake and diabetic retinopathy risk: a systematic review and meta-analysis. BMC Endocr Disord. 2020;20(1):106. PMID 32680496
• Margolin E, Blair K, Shemesh A. Toxic and nutritional optic neuropathy. StatPearls, 2023. PMID 29763154
• Baj J, Forma A, Kobak J, et al. Toxic and nutritional optic neuropathies: an updated mini-review. Int J Environ Res Public Health. 2022;19(5):3092. PMID 35270784
• Grzybowski A, Zülsdorff M, Wilhelm H, Tonagel F. Toxic optic neuropathies: an updated review. Acta Ophthalmol. 2015;93(5):402-410. PMID 25159832
• Jefferis JM, Hickman SJ. Treatment and outcomes in nutritional optic neuropathy. Curr Treat Options Neurol. 2019;21(1):5. PMID 30729321
• Constantin FS, Ion MI, Constantin AE. Tobacco-alcohol toxic optic neuropathy. Rom J Ophthalmol. 2019;63(4):403-405. PMID 31915743
• Nicolaou N, Nicolaou D, Douglas L, Christou S. Ethanol and cyanide: a case report on toxic and nutritional optic neuropathy associated with alcohol and tobacco. Cureus. 2025;17(11):e97067. PMID 41426861
• Chiotoroiu SM, Noaghi M, Stefaniu GI, et al. Tobacco-alcohol optic neuropathy: clinical challenges in diagnosis. J Med Life. 2014;7(4):472-476. PMID 25713605
• Longhena M, Bellucci C, Delfini E, et al. One-year follow up of a tobacco alcohol optic neuropathy case with atypical course. Eur J Ophthalmol. 2024;34(1):NP138-NP143. PMID 36862592
• Nowomiejska K, Kiszka A, Maciejewski R, et al. Central scotoma in tobacco-alcohol toxic optic neuropathy measured with semi-automated kinetic perimetry. Cutan Ocul Toxicol. 2018;37(4):319-323. PMID 29688089
• Şahin T, Karadere ME, Yıldız V, Çobanoğlu E. Evaluation of the retinal nerve fiber layer with optical coherence tomography in patients with alcohol use disorder. J Fr Ophtalmol. 2021;44(5):665-669. PMID 33840492
• Ahuja S, Kumar PS, Kumar VP, et al. Effect of chronic alcohol and tobacco use on retinal nerve fibre layer thickness: a case-control study. BMJ Open Ophthalmol. 2016;1(1):e000003. PMID 29354691

This article is intended for information purposes and does not replace a medical consultation. Indications, expected benefits and risks depend on each individual situation. For any question concerning your vision, consult an ophthalmologist.