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Do Alcohol and Smoking Increase Glaucoma Risk? A New 9,418-Person Study Finds a Stronger Link · Glaucoma, Vision & Longevity: Supplements & Science

• 0:00
  SPEAKER_00: Do alcohol and smoking increase glaucoma risk?
• 0:03
  SPEAKER_00: A new 9,418-person study finds a stronger link.
• 0:08
  SPEAKER_00: A study published on October 10, 2026, reports that alcohol use and cigarette smoking were more common among people with primary open-angle glaucoma in a large African clinic-based sample.
• 0:20
  SPEAKER_00: The headline figures are striking.
• 0:21
  SPEAKER_00: Former drinkers had about 49% higher odds of glaucoma, and current smokers about 46% higher odds.
• 0:28
  SPEAKER_00: But the details complicate the headline.
• 0:30
  SPEAKER_00: This was a cross-sectional clinic-based study, not a study that followed healthy people to see who later developed glaucoma.
• 0:38
  SPEAKER_00: Most cases came from glaucoma clinics, while most controls came from cataract or general medical clinics.
• 0:45
  SPEAKER_00: The researchers measured recent substance use, not lifetime exposure.
• 0:50
  SPEAKER_00: And when former drinkers were excluded, the association between current drinking and glaucoma was no longer statistically clear.
• 0:57
  SPEAKER_00: My overall reading, heavy or repeated binge drinking may modestly contribute to glaucoma risk, but the evidence is not conclusive.
• 1:05
  SPEAKER_00: The case that cigarette smoking causes glaucoma to develop is weaker.
• 1:09
  SPEAKER_00: Smoking may, however, speed up structural damage in people who already have glaucoma.
• 1:14
  SPEAKER_00: That possibility has some direct but limited evidence.
• 1:17
  SPEAKER_00: The new Eyes of Africa study, what it found.
• 1:20
  SPEAKER_00: The Eyes of Africa analysis included 9,418 people aged 40 or older, 5,189 with primary open-angle glaucoma, and 4,229 controls.
• 1:33
  SPEAKER_00: Participants were enrolled from 2017 through 2023 at 16 centers in Nigeria, Ghana, and Malawi.
• 1:40
  SPEAKER_00: The researchers used structured interviews to ask about alcohol, tobacco, medications, and other substances, then used statistical models to estimate adjusted odds of being a glaucoma case.
• 1:51
  SPEAKER_00: The Eyes of Africa Alcohol and Smoking Study How Cases and Controls Were Recruited.
• 1:56
  SPEAKER_00: The sample was assembled mainly through eye care clinics rather than by randomly sampling the population.
• 2:02
  SPEAKER_00: 98.6% of glaucoma cases came from glaucoma clinics.
• 2:06
  SPEAKER_00: 1.4% came from community outreach.
• 2:09
  SPEAKER_00: 93.1% of controls came from cataract clinics or general geriatric clinics.
• 2:14
  SPEAKER_00: 6.9% came from community outreach.
• 2:17
  SPEAKER_00: The teams invited consecutive eligible patients, which helps avoid cherry picking within those clinics, but does not make the clinics representative of the wider population.
• 2:28
  SPEAKER_00: That imbalance matters.
• 2:30
  SPEAKER_00: It means the study's odds ratios describe differences in this selected case control sample.
• 2:35
  SPEAKER_00: They are not direct estimates of how much an individual's chance of developing glaucoma changes.
• 2:41
  SPEAKER_00: Eyes of Africa study methods.
• 2:43
  SPEAKER_00: How glaucoma was diagnosed.
• 2:46
  SPEAKER_00: The study used the International Society of Geographical and Epidemiological Ophthalmology criteria.
• 2:52
  SPEAKER_00: In everyday terms, a diagnosis required evidence of damage to the optic nerve, usually supported by a characteristic visual field defect, an open drainage angle on gonioscopy, and no other eye condition that better explained the damage.
• 3:06
  SPEAKER_00: In some severely damaged eyes, where a usable visual field test was not possible, advanced optic nerve damage could support the diagnosis.
• 3:14
  SPEAKER_00: Controls had no clinical evidence of glaucoma and an eye pressure below 22 mm of mercury.
• 3:20
  SPEAKER_00: Eyes of Africa Methods.
• 3:21
  SPEAKER_00: The substance use article itself does not report glaucoma severity or eye pressure by alcohol or smoking category.
• 3:28
  SPEAKER_00: A companion report on the same cohort supplies useful context.
• 3:32
  SPEAKER_00: Cases averaged 63.9 years of age versus 61.4 for controls.
• 3:38
  SPEAKER_00: 76.8% of cases had severe glaucoma in at least one eye at recruitment.
• 3:43
  SPEAKER_00: Average eye pressure at study entry was 19.8 mm of mercury in cases, compared with 14.5 in hospital-based controls and 12.8 in community controls.
• 3:55
  SPEAKER_00: The case's average historical maximum pressure was 24.9.
• 3:59
  SPEAKER_00: These figures describe the overall cohort, not the drinking or smoking subgroups, and many cases were already receiving treatment.
• 4:06
  SPEAKER_00: Eyes of Africa cohort profile.
• 4:09
  SPEAKER_00: Age and social differences between groups.
• 4:11
  SPEAKER_00: The glaucoma group was older.
• 4:13
  SPEAKER_00: Among cases, 29.1% were 80 or older compared with 20.7% of controls.
• 4:19
  SPEAKER_00: Cases were also more often male, unemployed, and had completed secondary education or more.
• 4:24
  SPEAKER_00: In the adjusted model, unemployment was associated with higher odds of being a case, 1.23, as was secondary education or higher, 1.27.
• 4:34
  SPEAKER_00: These are social characteristics, not proof that unemployment or education causes glaucoma.
• 4:40
  SPEAKER_00: They may also reflect differences in health, access to eye care, or diagnosis.
• 4:44
  SPEAKER_00: Eyes of Africa study results.
• 4:47
  SPEAKER_00: The reported alcohol and smoking figures.
• 4:49
  SPEAKER_00: The study's adjusted odds ratios compared with never users unless otherwise specified were.
• 4:55
  SPEAKER_00: For the full table, please open this article on VisualFieldTest.com.
• 5:00
  SPEAKER_00: The reported estimates are real, but they need careful interpretation.
• 5:04
  SPEAKER_00: Former drinker meant no alcohol in the 30 days before the interview, not necessarily someone who had permanently quit after years of heavy drinking.
• 5:13
  SPEAKER_00: Current drinker meant at least one drink in that 30-day period.
• 5:17
  SPEAKER_00: Former smoker meant having smoked more than 100 cigarettes over a lifetime, but not in the prior 30 days.
• 5:24
  SPEAKER_00: These brief definitions do not tell us how much a person used to drink or smoke, for how long or how long ago they stopped.
• 5:32
  SPEAKER_00: Eyes of Africa exposure definitions and regression results.
• 5:36
  SPEAKER_00: There is also an important detail about the heavy episodic drinking result.
• 5:41
  SPEAKER_00: In the paper, the measure was the largest amount ever consumed in a single day, more than two drinks versus two or fewer.
• 5:48
  SPEAKER_00: It did not measure how often this happened or the person's lifetime total.
• 5:52
  SPEAKER_00: It is therefore not a reliable measure of sustained heavy drinking, and it is not the same as a well-characterized dose response analysis.
• 6:00
  SPEAKER_00: What the study did and did not show about dosed hair, the study did not record lifetime alcohol units or smoking pack years.
• 6:09
  SPEAKER_00: Pack years combine the number of cigarette packs smoked each day with the number of years smoked.
• 6:15
  SPEAKER_00: Without these cumulative measures, the researchers could not test whether risk rose steadily with long-term exposure.
• 6:22
  SPEAKER_00: Among current drinkers, reported monthly consumption did not differ significantly between cases and controls.
• 6:29
  SPEAKER_00: Among current smokers, the number of cigarettes smoked per day also did not differ significantly.
• 6:36
  SPEAKER_00: Those comparisons were limited by small numbers at higher exposure levels.
• 6:40
  SPEAKER_00: The study therefore offers no clear dose and frequency curve for either substance.
• 6:48
  SPEAKER_00: Two further results deserve attention.
• 6:50
  SPEAKER_00: In an analysis restricted to current and never users, current drinking was not associated with higher glaucoma odds.
• 6:56
  SPEAKER_00: Adjusted odds ratio 0.90, 95% confidence interval 9.78 to 1.04.
• 7:03
  SPEAKER_00: The alcohol signal in the main analysis was therefore substantially influenced by the former drinker group.
• 7:09
  SPEAKER_00: In that restricted analysis, the association with current smoking remained.
• 7:13
  SPEAKER_00: Adjusted odds ratio 1.62, 95% confidence interval 1.16 to 2.27.
• 7:20
  SPEAKER_00: This is still an association within a clinic-based sample, not proof of causation.
• 7:26
  SPEAKER_00: The team adjusted for age, sex, education, employment, country of birth, and other measured substance use variables.
• 7:33
  SPEAKER_00: It did not fully account in its main model for factors such as family history of glaucoma, eye pressure, central corneal thickness, myopia, or a detailed set of medical and vascular conditions.
• 7:45
  SPEAKER_00: A supplementary model adding body mass index reduced the current alcohol association until it was no longer statistically significant.
• 7:53
  SPEAKER_00: The authors reported that several other associations changed less.
• 7:57
  SPEAKER_00: Eyes of Africa adjusted results and limitations.
• 8:00
  SPEAKER_00: Why do former drinkers look worse than current drinkers?
• 8:04
  SPEAKER_00: At first glance, the former drinker result, an odds ratio of 1.49 compared with 1.15 for current drinkers, could seem to suggest that quitting alcohol increases glaucoma risk.
• 8:15
  SPEAKER_00: That is not a sensible causal interpretation.
• 8:18
  SPEAKER_00: Several other explanations are more likely.
• 8:22
  SPEAKER_00: Illness-related quitting and reverse causation.
• 8:25
  SPEAKER_00: People may reduce or stop drinking after a diagnosis, after developing another illness, or when treatment or family circumstances change.
• 8:33
  SPEAKER_00: If some glaucoma cases had already been diagnosed before the interview, their diagnosis could have influenced their drinking.
• 8:40
  SPEAKER_00: Because glaucoma often develops unnoticed for years, it is difficult to know whether alcohol use preceded the disease, changed because of it, or both.
• 8:51
  SPEAKER_00: The Eyes of Africa study does not report when each person stopped drinking relative to glaucoma onset or diagnosis.
• 8:58
  SPEAKER_00: Its cross-sectional design cannot sort out that sequence.
• 9:01
  SPEAKER_00: The researchers themselves noted that people may have reduced drinking after diagnosis or health advice.
• 9:08
  SPEAKER_00: Eyes of Africa Discussion.
• 9:10
  SPEAKER_00: The former drinker category combines very different people.
• 9:14
  SPEAKER_00: A person who stopped drinking last week and a person who stopped decades ago are both former drinkers in this analysis.
• 9:22
  SPEAKER_00: So are people who drank only occasionally and happen not to drink in the last 30 days.
• 9:27
  SPEAKER_00: The category does not distinguish illness-related quitting from social, religious, financial, or other reasons for not drinking.
• 9:35
  SPEAKER_00: This broad grouping can make the former drinker association difficult to interpret.
• 9:40
  SPEAKER_00: It also leaves room for sick quitter bias.
• 9:42
  SPEAKER_00: People may quit because they are unwell, and their illness, not their quitting, may be associated with glaucoma or with clinic attendance.
• 9:51
  SPEAKER_00: Age, health, and survival could also contribute it.
• 9:55
  SPEAKER_00: Cases were older than controls and age is a powerful glaucoma risk factor.
• 10:00
  SPEAKER_00: The model adjusted for age bands, but broad age categories cannot remove every age-related difference.
• 10:07
  SPEAKER_00: Health conditions, long-term alcohol history, and reasons for quitting could also differ between groups.
• 10:13
  SPEAKER_00: The exposure analysis did not fully adjust for these factors.
• 10:17
  SPEAKER_00: Survival bias is another possibility.
• 10:19
  SPEAKER_00: People with the heaviest or longest alcohol exposure may be less likely to survive to older ages and enter the study.
• 10:26
  SPEAKER_00: The older people who remain available for recruitment may not represent everyone who had similar past drinking habits.
• 10:33
  SPEAKER_00: This is a plausible explanation, not something this study tested.
• 10:37
  SPEAKER_00: A similar former drinker pattern appeared in the United Kingdom Biobank.
• 10:41
  SPEAKER_00: Former drinkers had higher glaucoma prevalence and, interestingly, slightly lower eye pressure.
• 10:48
  SPEAKER_00: That combination is compatible with reverse causation or health-related quitting.
• 10:53
  SPEAKER_00: It does not show that stopping drinking damages the optic nerve.
• 10:57
  SPEAKER_00: United Kingdom Biobank Alcohol Study.
• 11:00
  SPEAKER_00: Selection bias, a major caution about this study.
• 11:03
  SPEAKER_00: Recruiting almost all cases from glaucoma clinics and most controls from cataract or geriatric clinics creates a risk that the two groups differ in ways beyond glaucoma.
• 11:13
  SPEAKER_00: Clinic attendance can depend on health, income, education, distance from a hospital, other eye conditions, and other reasons for seeking care.
• 11:22
  SPEAKER_00: Consecutive recruitment reduces selective enrollment among eligible attendees, but cannot remove differences created by how people entered the clinics in the first place.
• 11:32
  SPEAKER_00: This could distort the results in either direction.
• 11:35
  SPEAKER_00: For example, if smoking influences the chance of developing cataract and attending a cataract clinic, smokers could be more common among controls, potentially weakening the apparent smoking association.
• 11:48
  SPEAKER_00: On the other hand, a clinic-based glaucoma group with many severe cases could overrepresent exposures associated with advanced disease or diagnosis.
• 11:58
  SPEAKER_00: Neither possibility was measured directly.
• 12:01
  SPEAKER_00: The study is valuable for highlighting questions in an understudied population, but it should not be read as a representative survey of people across Nigeria, Ghana, and Malawi, nor as showing that the reported odds ratios are the causal effects of drinking or smoking.
• 12:20
  SPEAKER_00: How do the findings compare with other research?
• 12:23
  SPEAKER_00: Alcohol, a small association overall with uncertainty about causation.
• 12:28
  SPEAKER_00: A 2022 systematic review and meta-analysis pooled 11 studies and found a modest association between any alcohol use and open angle glaucoma, 1.18, 95% confidence interval 1.02 to 1.36.
• 12:42
  SPEAKER_00: The estimate for incident glaucoma, new disease developing over time, was 1.22, but its confidence interval included no increase, 0.91 to 1.63.
• 12:54
  SPEAKER_00: The authors highlighted substantial differences between studies and noted that most underlying studies had limitations.
• 13:01
  SPEAKER_00: They did not consider the pooled result strong proof of harm.
• 13:04
  SPEAKER_00: Systematic review and meta-analysis of alcohol, eye pressure, and glaucoma.
• 13:10
  SPEAKER_00: The United Kingdom Biobank offers more detailed measurements, but its major analyses were still observational.
• 13:17
  SPEAKER_00: Among regular drinkers, higher reported alcohol intake, tracked with slightly higher eye pressure, thinner inner retinal layers on eye scans, and higher glaucoma prevalence at the highest intake levels.
• 13:29
  SPEAKER_00: Compared with the lowest drinking quintile, the highest quintile had 1.36 times the odds of prevalent glaucoma, 95% confidence interval 1.12 to 1.66.
• 13:41
  SPEAKER_00: Regular drinkers as a group, however, did not have a statistically clear increase in glaucoma compared with infrequent drinkers.
• 13:48
  SPEAKER_00: The study's genetic analyses found evidence connecting genetically predicted alcohol intake with one scan measure, the macular ganglion cell interplexiform layer.
• 13:58
  SPEAKER_00: Evidence for some other eye outcomes was weaker.
• 14:01
  SPEAKER_00: This supports biological plausibility, but it does not by itself establish that alcohol causes clinically diagnosed glaucoma.
• 14:09
  SPEAKER_00: The researchers also found that the alcohol eye pressure association was stronger among people with higher genetic susceptibility to glaucoma.
• 14:18
  SPEAKER_00: That is a reason to study susceptibility further, not proof that alcohol has a known high-risk effect in any specific patient.
• 14:26
  SPEAKER_00: United Kingdom Biobank Alcohol Study.
• 14:29
  SPEAKER_00: A separate retrospective study followed glaucoma suspects, people under observation because of possible early disease.
• 14:36
  SPEAKER_00: Over about nine years, alcohol consumption was associated with later visual field conversion to glaucoma, hazard ratio 1.57, 95% confidence interval, 1.03 to 2.38.
• 14:49
  SPEAKER_00: This is relevant because exposure was assessed in a group followed over time, but it was a selected group of suspects, and the study was not a randomized trial.
• 14:58
  SPEAKER_00: Glaucoma suspect cohort study.
• 15:00
  SPEAKER_00: Smoking population-level studies often find little or no association.
• 15:05
  SPEAKER_00: A 2025 systematic review included four cohort studies, six cross-sectional studies, and nine case control studies.
• 15:12
  SPEAKER_00: It found no clear association between glaucoma and current smoking, odds ratio.96, 95% confidence interval 0.76 to 1.21, or former smoking 0.96, 0.83 to 1.11.
• 15:27
  SPEAKER_00: The review also noted that most included studies had important risk of bias concerns, so the null result does not rule out a smaller effect or an effect in heavy smokers.
• 15:37
  SPEAKER_00: Systematic review and meta-analysis of cigarette smoking and glaucoma.
• 15:41
  SPEAKER_00: A 2024 Mendelian randomization paper likewise did not find statistically clear associations for alcohol or smoking.
• 15:49
  SPEAKER_00: Its conclusion deserves limited weight.
• 15:51
  SPEAKER_00: It used a small number of genetic instruments for alcohol and compared genetic exposure data from European populations with glaucoma data from an East Asian population.
• 16:01
  SPEAKER_00: Those design constraints make it a weak test of possible effects in people of African ancestry.
• 16:07
  SPEAKER_00: Mendelian randomization study of alcohol, smoking, and glaucoma.
• 16:12
  SPEAKER_00: A companion analysis of the broader Eyes of Africa cohort also found that a history of alcohol use was associated with glaucoma, but at a smaller adjusted size, 1.17, 95% confidence interval 1.03 to 1.32, while smoking was not statistically clear, 1.17, 0.94 to 1.46.
• 16:34
  SPEAKER_00: Because this was the same underlying cohort, it is not independent confirmation.
• 16:38
  SPEAKER_00: The difference between analyses also shows how results can depend on exposure definitions and model choices.
• 16:44
  SPEAKER_00: Eyes of Africa Baseline Cohort report Alcohol, Eye Pressure, and the Apparent Paradox.
• 16:50
  SPEAKER_00: Alcohol can briefly lower eye pressure after drinking.
• 16:53
  SPEAKER_00: Controlled physiological studies summarized in the systematic review found temporary reductions, often around 1 to 4 mm of mercury after moderate doses, with larger reductions reported after larger doses.
• 17:06
  SPEAKER_00: The effect is short-lived.
• 17:08
  SPEAKER_00: Alcohol has also been reported to increase blood flow near the optic nerve in small short-term studies.
• 17:15
  SPEAKER_00: Neither observation means alcohol is a glaucoma treatment.
• 17:19
  SPEAKER_00: Alcohol eye pressure and open angle glaucoma review.
• 17:22
  SPEAKER_00: Over a longer period, other processes might pull in the opposite direction.
• 17:27
  SPEAKER_00: Eye pressure and fluid drainage.
• 17:29
  SPEAKER_00: In observational studies of regular drinkers, higher reported intake is associated with slightly higher average eye pressure.
• 17:36
  SPEAKER_00: One proposed explanation is chronic oxidative stress affecting the eyes' drainage tissues, but the pathway has not been established as the cause in people.
• 17:47
  SPEAKER_00: Blood pressure and circulation.
• 17:48
  SPEAKER_00: Heavy drinking can affect blood pressure and vascular health.
• 17:52
  SPEAKER_00: Low blood pressure during sleep is relevant to optic nerve blood supply in some patients, especially people with normal tension glaucoma.
• 18:00
  SPEAKER_00: But it has not been shown that alcohol-related nighttime blood pressure changes account for the Eyes of Africa findings.
• 18:07
  SPEAKER_00: Nerve cell stress, long-term heavy alcohol exposure, can cause oxidative and metabolic stress in the body.
• 18:14
  SPEAKER_00: Effects on retinal nerve cells and their mitochondria, the structures that help cells make energy, are biologically plausible, but evidence tying these pathways specifically to primary open angle glaucoma in people is limited.
• 18:28
  SPEAKER_00: Nutrition.
• 18:29
  SPEAKER_00: Severe long-term alcohol misuse can be accompanied by nutritional deficiencies and optic nerve injury.
• 18:36
  SPEAKER_00: That is a recognized concern for vision, but nutritional optic nerve damage is not the same disease as primary open angle glaucoma.
• 18:43
  SPEAKER_00: So the short-term and long-term effects are not necessarily contradictory.
• 18:48
  SPEAKER_00: A brief drop in eye pressure after a drink does not establish long-term protection.
• 18:54
  SPEAKER_00: It may be outweighed by other effects, or simply be irrelevant to cumulative nerve damage.
• 19:00
  SPEAKER_00: The long-term glaucoma evidence, however, remains too uncertain to say exactly how much risk is attributable to alcohol itself.
• 19:08
  SPEAKER_00: Smoking, plausible harm to the eye, uncertain effect on glaucoma onset.
• 19:13
  SPEAKER_00: Smoking can affect the circulation and expose tissues to oxidants.
• 19:17
  SPEAKER_00: Nicotine and other components of tobacco smoke may influence blood vessel tone and signaling molecules, such as nitric oxide and endothelin-1.
• 19:26
  SPEAKER_00: Researchers have proposed effects on blood supply to the optic nerve, eye pressure, and oxidative stress in optic nerve or eye drainage tissues.
• 19:35
  SPEAKER_00: These mechanisms are plausible, but they do not prove that smoking causes primary open-angle glaucoma.
• 19:42
  SPEAKER_00: Studies of smoking and eye pressure have been mixed.
• 19:45
  SPEAKER_00: The Blue Mountains eye study reported a modest cross-sectional association between current smoking and higher eye pressure, while other research has not found a consistent effect.
• 19:55
  SPEAKER_00: Blue Mountains Eye Study on Smoking and Eye Pressure.
• 19:59
  SPEAKER_00: Some studies of people without diagnosed glaucoma have reported thinner retinal nerve fiber layers among heavier smokers.
• 20:06
  SPEAKER_00: Such scan findings are not specific to glaucoma, and they cannot show that a smoker will develop it.
• 20:13
  SPEAKER_00: The Eyes of Africa analysis also lacked pack years, long-term smoking history, and sufficient detail to compare smoking duration or nicotine exposure.
• 20:22
  SPEAKER_00: Nicotine without burning tobacco is a separate, unanswered question.
• 20:27
  SPEAKER_00: The Eyes of Africa study examined smoking.
• 20:30
  SPEAKER_00: It did not compare cigarette smoking with nicotine patches, gum, or vaping.
• 20:34
  SPEAKER_00: These results cannot be used to estimate the glaucoma effects of nicotine replacement products or other nicotine-only exposure.
• 20:42
  SPEAKER_00: Could alcohol or smoking matter more in some people?
• 20:45
  SPEAKER_00: It is reasonable to ask whether a small exposure-related stress matters more when the optic nerve is already vulnerable.
• 20:53
  SPEAKER_00: The United Kingdom Biobank found a stronger association between alcohol intake and eye pressure in participants with higher genetic susceptibility to glaucoma.
• 21:03
  SPEAKER_00: But it did not establish a reliable patient-level rule for deciding who should avoid alcohol.
• 21:09
  SPEAKER_00: People with high myopia, thin corneas, vascular dysregulation, normal tension glaucoma, or existing optic nerve damage may warrant particular clinical attention for other reasons.
• 21:21
  SPEAKER_00: Thin corneas can affect how eye pressure readings are interpreted, and vascular factors may matter in some forms of glaucoma.
• 21:28
  SPEAKER_00: However, the Eyes of Africa Substance Study did not report alcohol or smoking-related effects separately for these groups.
• 21:35
  SPEAKER_00: It also excluded people with very high myopia from the broader cohort.
• 21:40
  SPEAKER_00: Claims that these patients are specifically more harmed by drinking or smoking would go beyond the evidence.
• 21:46
  SPEAKER_00: Does either exposure speed glaucoma after it has developed?
• 21:51
  SPEAKER_00: This is a different question from whether an exposure helps cause glaucoma in the first place.
• 21:56
  SPEAKER_00: Alcohol after diagnosis a Korean nationwide Cohort followed 13,643 people with newly diagnosed open-angle glaucoma who had been drinking before diagnosis.
• 22:07
  SPEAKER_00: Those who reported abstaining afterward had a lower risk of severe visual impairment or blindness than those who continued drinking, adjusted hazard ratio 0.63, 95% confidence interval 0.45 to 0.87.
• 22:21
  SPEAKER_00: Among continuing drinkers, the reported risks were higher for both lower and moderate to heavy consumption, and for drinking four or more days per week.
• 22:31
  SPEAKER_00: This is an important signal, but it is not definitive proof that stopping alcohol slows glaucoma progression.
• 22:38
  SPEAKER_00: The study used health insurance and examination data, not detailed clinical measures of optic nerve change, and the authors acknowledge that other lifestyle changes or residual differences between people who stopped and continued drinking could explain part of the result.
• 22:53
  SPEAKER_00: Korean cohort of alcohol use after glaucoma diagnosis.
• 22:57
  SPEAKER_00: Smoking after diagnosis.
• 23:00
  SPEAKER_00: A longitudinal study of 314 people with primary open-angle glaucoma, followed for an average of 6.6 years, reported faster retinal nerve fiber layer thinning with greater smoking intensity.
• 23:13
  SPEAKER_00: The estimated difference was about 0.06 micrometers per year for each additional 10 pack years.
• 23:19
  SPEAKER_00: Thinning was reported as significantly faster above 8 pack years.
• 23:24
  SPEAKER_00: This is direct evidence about structural progression, but it comes from one observational study and does not prove that quitting will reverse or halt the change.
• 23:33
  SPEAKER_00: Longitudinal study of smoking and retinal nerve fiber layer thinning.
• 23:38
  SPEAKER_00: How likely is a causal effect?
• 23:40
  SPEAKER_00: The probabilities below are my evidence-based judgments, not estimates produced by a validated prediction model.
• 23:48
  SPEAKER_00: They refer to whether the exposure itself contributes to development of primary open-angle glaucoma, not merely whether it is associated with the disease in a particular sample.
• 23:58
  SPEAKER_00: For the full table, please open this article on VisualFieldtest.com.
• 24:02
  SPEAKER_00: These estimates are deliberately more cautious than simply repeating the Eyes of Africa odds ratios.
• 24:08
  SPEAKER_00: They give weight to the study's large size and the biological and observational signals, but also to its clinic-based recruitment, the former drinker pattern, missing cumulative exposure data, inconsistent smoking reviews, and the lack of definitive causal evidence.
• 24:24
  SPEAKER_00: For progression after diagnosis, I would rate the evidence as suggestive but still limited.
• 24:30
  SPEAKER_00: Moderate confidence that heavy alcohol use may worsen outcomes and low to moderate confidence that cumulative smoking may speed structural loss.
• 24:39
  SPEAKER_00: Neither is as firmly established as eye pressure reduction, the core proven treatment target for glaucoma.
• 24:46
  SPEAKER_00: If you already have glaucoma, does drinking or smoking actually matter?
• 24:50
  SPEAKER_00: Yes, it can matter, but the strength of the evidence differs.
• 24:54
  SPEAKER_00: Do not use alcohol to lower eye pressure.
• 24:57
  SPEAKER_00: Its short-term pressure-lowering effect is temporary and does not replace prescribed treatment or monitoring.
• 25:03
  SPEAKER_00: Avoiding heavy drinking and repeated binge drinking is a reasonable precaution.
• 25:08
  SPEAKER_00: Heavy drinking has many established health risks, and glaucoma studies provide a plausible, though not conclusive, additional reason to reduce it.
• 25:17
  SPEAKER_00: Evidence that occasional moderate drinking speeds glaucoma progression is much less certain.
• 25:23
  SPEAKER_00: Stopping cigarette smoking is strongly advisable for overall health.
• 25:27
  SPEAKER_00: For glaucoma specifically, the evidence that smoking causes the disease is mixed, but one longitudinal study links higher PAC years with faster retinal nerve fiber layer thinning.
• 25:39
  SPEAKER_00: Smoking cessation is reasonable even though it has not been proven to prevent or reverse glaucoma.
• 25:45
  SPEAKER_00: Do not change glaucoma medication or skip appointments based on these studies.
• 25:50
  SPEAKER_00: Regular examination and the treatment plan from your eye care professional remains central.
• 25:56
  SPEAKER_00: Ask your clinician about blood pressure, eye pressure, and any other health issues relevant to your glaucoma.
• 26:02
  SPEAKER_00: If you drink heavily or may be physically dependent on alcohol, seek medical advice before stopping suddenly.
• 26:10
  SPEAKER_00: Withdrawal can be dangerous, and a clinician can help plan a safer reduction.
• 26:14
  SPEAKER_00: Bottom line The Eyes of Africa study strengthens the case for investigating heavy alcohol use and smoking, but it does not establish that either exposure caused glaucoma.
• 26:25
  SPEAKER_00: The former drinker result is particularly vulnerable to illness-related quitting, age differences, and selection effects.
• 26:33
  SPEAKER_00: Heavy alcohol use is the more plausible causal concern for glaucoma development.
• 26:38
  SPEAKER_00: Smoking remains a clearer health hazard than a proven cause of glaucoma.
• 26:42
  SPEAKER_00: For people who already have glaucoma, reducing heavy alcohol use and stopping smoking are sensible steps, but neither should be presented as a substitute for established glaucoma care.
• 26:53
  SPEAKER_00: Eyes of Africa Study, Alcohol and Glaucoma Metaanalysis, Smoking and Glaucoma Metaanalysis.
• 27:01
  SPEAKER_00: All links to sources are available in the text version of this article.
• 27:05
  SPEAKER_00: You can find the full article at VisualFieldTest.com.
• 27:08
  SPEAKER_00: Thanks for listening.
• 27:09
  SPEAKER_00: To check your visual field, click the link at the bottom of this article or visit VisualFieldtest.com.