How do smoking and aging affect the risk of having both cataracts and Age-Related Macular Degeneration?
Cataracts and age-related macular degeneration (AMD) are two common eye conditions that often occur together, especially in older adults. Smoking and aging are major risk factors for both diseases. Research shows that these factors don't just add up; they can work together to make the risk of having both conditions much higher, particularly in people over age 75.
What the research says
A 2024 study using machine learning analyzed 640 participants (264 with both cataracts and AMD, and 376 controls) to identify key risk factors for having both conditions 5. The study found that smoking and aging were critical contributors, along with elevated C-reactive protein (CRP) levels, a marker of inflammation 5. Notably, the analysis revealed a non-linear synergistic effect: smoking was associated with an exponentially higher risk of having both cataracts and AMD in individuals older than 75 years 5. This means that for people over 75 who smoke, the combined risk is much greater than simply adding the risks from smoking and aging separately. The study also confirmed that drusen severity (a hallmark of AMD) and lens opacity (cataract severity) were the dominant eye-specific predictors 5. These findings align with broader knowledge that chronic smoking is the most consistently proven lifestyle risk factor for AMD 8, and that aging and oxidative stress play key roles in both cataract and AMD development 489.
What to ask your doctor
- Given my age and smoking history, what is my personal risk for developing both cataracts and AMD?
- Are there any specific eye exams or imaging tests you recommend to check for early signs of both conditions?
- How does quitting smoking affect my risk of developing or worsening cataracts and AMD?
- Should I have my C-reactive protein (CRP) level checked as part of my eye health assessment?
- What lifestyle changes or supplements (like antioxidants) might help lower my risk for both cataracts and AMD?
This question is drawn from common patient questions about Ophthalmology and answered using cited medical research. We do not provide individualized advice.