The Study
Smoking and age related macular degeneration: the number of pack years of cigarette smoking is a major determinant of risk for both geographic atrophy and choroidal neovascularisation
This study looked at people who already had eye damage and asked them if they smoked, then compared them to people without the damage. It found that people who smoked more were more likely to have the eye problem, but it didn't prove smoking caused it — maybe other things like diet or genes played a role too.
Analysis score
Maximum 58 for a case-control study.
Where the score came from
This study looked at how smoking affects the back of the eye, where vision problems happen in older people.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 558 / 100
Quality score
Researchers compare people who have a condition (cases) with similar people who do not (controls), looking back in time for differences in exposure. Useful but more prone to bias.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this means smoking heavily can seriously damage your vision as you get older, but quitting for a long time can undo that risk, and even breathing other people’s smoke can hurt your eyes.
- 2People who smoked more than 40 pack-years (like 2 packs a day for 20 years) were over 2.5 times more likely to get severe vision loss.
- 3Those who quit smoking for over 20 years had the same risk as people who never smoked.
- 4Even people who never smoked but lived with a smoker for 5+ years had nearly double the risk.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
British Journal of Ophthalmology
Year
2005
Authors
J. Khan, D. Thurlby, Humma Shahid, D. Clayton, J. Yates, M. Bradley, A. Moore, A. Bird
Related Content
Claims (6)
People who smoke cigarettes have twice the risk of developing age-related macular degeneration due to oxidative damage and reduced blood flow to the retina.
People who stopped smoking more than 20 years ago have the same risk of developing advanced age-related macular degeneration as people who never smoked.
People who have smoked more cigarettes over their lifetime, measured in pack-years, have a higher risk of developing advanced age-related macular degeneration than those with similar smoking duration but lower total exposure, and total tobacco dose is a stronger predictor than whether someone currently smokes, formerly smoked, or never smoked.
People who have smoked more than 40 pack-years have 2.75 times higher odds of developing advanced age-related macular degeneration, including geographic atrophy and choroidal neovascularisation, compared to people who have never smoked.
Non-smokers who breathe in secondhand smoke for five or more years are 87% more likely to develop end-stage age-related macular degeneration than non-smokers with no secondhand smoke exposure.
People who smoke more than 40 pack-years have a higher risk of developing geographic atrophy than choroidal neovascularisation as a form of age-related macular degeneration.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.