what does your kidney health have to do with your eyes?
Understanding How Heart, Kidney, and Metabolic Health Affects Your VisioN
CKM syndrome is a newly recognized health condition that affects your heart, kidneys, and metabolism (how your body processes sugar and fat). These systems are closely connected, and when one has problems, it can create a harmful cycle that affects the others.
CKM syndrome includes conditions like:
- Excess body weight, especially around the waist
- High blood pressure
- Diabetes or prediabetes
- Kidney disease
- High cholesterol
- Heart disease
How Does CKM Syndrome Affect Your Eyes?
Recent research shows that people with poorly controlled CKM syndrome have a higher risk of developing age-related macular degeneration (AMD) as they age. AMD is an eye disease that affects the center of your vision, making it harder to read, drive, and recognize faces.
The connection happens because:
- Inflammation and oxidative stress from metabolic problems can damage the delicate tissues in the back of your eye
- Poor blood flow from heart and kidney problems can affect the blood vessels that nourish your retina
- These changes can lead to vision loss over time
What is Age-Related Macular Degeneration (AMD)?
AMD is a leading cause of vision loss in people over 60. It affects the macula, the part of your eye responsible for sharp, central vision.
Early symptoms may include:
- Difficulty seeing in dim light or poorly lit rooms
- Trouble adjusting when moving from bright to dark areas
- Straight lines appearing wavy or distorted
- Blurred or decreased vision
- Dark spots in your central vision
Important: Many people have no symptoms in the early stages, which is why regular eye exams are crucial.
What Can You Do to Protect Your Vision?
1. Control Your CKM Risk Factors
Taking care of your heart, kidney, and metabolic health can help protect your vision:
- Keep your blood pressure under control
- Manage your blood sugar if you have diabetes
- Maintain a healthy weight
- Take medications as prescribed by your doctor
2. Stop Smoking
Smoking is the single most important risk factor you can change. Smokers have three times the risk of AMD compared to people who never smoked. The good news: your risk decreases when you quit.
3. Eat a Healthy Diet
A Mediterranean-style diet may help protect your eyes:
- Eat plenty of vegetables (at least 200g per day)
- Include fruits twice daily
- Eat fish twice a week, especially fatty fish like salmon
- Choose whole grains, legumes, nuts, and seeds
- Limit red meat
- Reduce alcohol consumption
4. Stay Physically Active
Regular physical activity may help reduce your risk of AMD and improve your overall CKM health.
5. Consider Nutritional Supplements
If you already have intermediate AMD (your eye doctor can tell you), ask about the AREDS2 formula, which contains:
- Vitamin C (500 mg)
- Vitamin E (400 IU)
- Lutein (10 mg)
- Zeaxanthin (2 mg)
- Zinc oxide (80 mg)
- Cupric oxide (2 mg)
Important: Don't start supplements without talking to your doctor first, especially if you smoke or used to smoke.
When Should You See Your Eye Doctor?
See your eye doctor immediately if you notice:
- Sudden changes in your vision
- Straight lines appearing wavy
- Dark or blank spots in your central vision
- Difficulty reading or recognizing faces
Regular eye exams are important:
- If you have CKM syndrome, ask your doctor how often you should have eye exams
- Early detection of AMD can help preserve your vision
The Bottom Line
Your heart, kidney, and metabolic health are connected to your eye health. By managing conditions like high blood pressure, diabetes, and kidney disease, you're not only protecting your heart and kidneys—you're also protecting your vision. Small changes in your lifestyle, especially quitting smoking and eating a healthy diet, can make a big difference.
Remember: Many vision problems can be prevented or slowed down when caught early. Don't skip your regular check-ups with both your primary care doctor and your eye doctor.
References
A Synopsis of the Evidence for the Science and Clinical Management of Cardiovascular-Kidney-Metabolic (CKM) Syndrome: A Scientific Statement From the American Heart Association. Ndumele CE, Neeland IJ, Tuttle KR, et al. Circulation. 2023;148(20):1636-1664. doi:10.1161/CIR.0000000000001186.
Age-Related Macular Degeneration. Guymer RH, Campbell TG. Lancet (London, England). 2023;401(10386):1459-1472. doi:10.1016/S0140-6736(22)02609-5.
Age-related macular degeneration. National Library of Medicine (MedlinePlus).
Age-Related Macular Degeneration. Apte RS. The New England Journal of Medicine. 2021;385(6):539-547. doi:10.1056/NEJMcp2102061.
Age-Related Macular Degeneration: A Review. Fleckenstein M, Schmitz-Valckenberg S, Chakravarthy U. JAMA. 2024;331(2):147-157. doi:10.1001/jama.2023.26074.
What Did We Learn in 35 years of Research on Nutrition and Supplements for Age-Related Macular Degeneration: A Systematic Review. Pameijer EM, Heus P, Damen JAA, et al. Acta Ophthalmologica. 2022;100(8):e1541-e1552. doi:10.1111/aos.15191.
Antioxidant Vitamin and Mineral Supplements for Slowing the Progression of Age-Related Macular Degeneration. Evans JR, Lawrenson JG. The Cochrane Database of Systematic Reviews. 2023;9:CD000254. doi:10.1002/14651858.CD000254.pub5.
