Factors Contributing to AMD: Genetic Risk and Ways to Reduce It

Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

This article is part of the PlexusDx Education Hub — your resource for evidence-based guidance on Genetics & Eye Health. Browse all Genetics & Eye Health education

Age-related macular degeneration (AMD) is one of the leading causes of vision loss in adults over 50, and it runs in families more strongly than almost any other common eye condition. Two people can share the same age, diet, and sun exposure yet face very different risk, and much of that gap traces back to genetics. Understanding the inherited factors behind AMD helps explain who is more vulnerable and why early, provider-guided monitoring matters so much.

What AMD is and how it progresses

AMD affects the macula, the central part of the retina responsible for sharp, detailed vision. It comes in two forms: the more common "dry" AMD, marked by yellow deposits called drusen and gradual thinning, and the less common but faster "wet" AMD, in which abnormal blood vessels grow and leak. Both forms involve chronic damage to retinal cells, and both are driven by a mix of aging, oxidative stress, inflammation, and — importantly — genetic susceptibility that sets each person's baseline risk.

CFH and the complement pathway

The single strongest genetic contributor to AMD is the CFH gene, which encodes complement factor H, a key brake on the immune system's complement cascade. The well-known Y402H variant in CFH weakens that brake, allowing chronic, low-grade inflammation in the retina. Large studies have shown that carrying this variant substantially increases AMD risk. Because complement activity is central to how the retina handles cellular debris and inflammation, CFH status is one of the most informative genetic signals in the entire condition.

ARMS2 and HTRA1 on chromosome 10

A second major risk locus sits on chromosome 10 and involves the ARMS2 and HTRA1 genes. Variants here are strongly associated with AMD, particularly the wet form and the growth of abnormal blood vessels. ARMS2/HTRA1 variants appear to affect how retinal tissue manages stress and maintains its supporting structures. Together, CFH and ARMS2/HTRA1 account for a large share of the inherited risk, which is why researchers consider them the backbone of AMD genetics.

Lifestyle factors that interact with your genes

Genes are not the whole story. Smoking is the strongest modifiable risk factor and can multiply genetic risk. Diet matters too: research such as the AREDS studies supports specific nutrients — including lutein, zeaxanthin, zinc, and antioxidant vitamins — for people at higher risk, always under clinical guidance. Cardiovascular health, sun protection, and regular dilated eye exams round out the picture. These steps do not change your DNA, but they influence how that genetic predisposition plays out over time.

How genetic insight fits into eye health

A genetic test does not diagnose AMD and cannot manage it — that is the role of an eye care professional using imaging and clinical exams. What genetic insight offers is context about inflammatory and cellular-stress pathways that shape susceptibility. The Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, 150+ genetic insights across biological systems including inflammation and oxidative-stress response. Use that information to have a more informed conversation with a qualified provider about monitoring and prevention. Genetics is a guide, not a guarantee.

Frequently Asked Questions

Is AMD hereditary?

AMD has one of the strongest genetic components of any common eye disease. Variants in CFH and the ARMS2/HTRA1 region account for much of the inherited risk. Having an affected parent or sibling raises your risk, though lifestyle factors like smoking and diet also strongly influence whether and how AMD develops.

Can a genetic test diagnose or manage AMD?

No. A genetic test does not diagnose, treat, cure, or prevent AMD. Only an eye care professional can diagnose it through a dilated exam and retinal imaging. Genetic insight offers pathway-level context about inflammation and cellular stress that can inform a discussion about monitoring and risk reduction.

What lifestyle changes lower AMD risk?

Not smoking is the most impactful step, since smoking sharply raises AMD risk. A diet rich in leafy greens, and clinician-guided AREDS-type nutrients for higher-risk individuals, supports retinal health. Managing blood pressure, protecting eyes from UV light, and getting regular dilated eye exams also help detect changes early.

If I carry CFH or ARMS2 variants, will I definitely get AMD?

No. Carrying a risk variant raises probability, not certainty. Many carriers never develop AMD, and some non-carriers do. Genetics interacts with age, smoking, diet, and cardiovascular health. That is why the variant is best viewed as one factor to discuss with your provider, not a diagnosis or a fixed outcome.

Know your biology before you act on it. The Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, 150+ genetic insights so you can bring a clearer picture of your genetic landscape to a conversation with a qualified provider. Genetics is a guide, not a guarantee — test before you invest in any protocol.

This article is part of the PlexusDx Education Hub. Browse all Genetics & Eye Health education

The Precision Peptide Genetic Test analyzes how your genes influence peptide-related biological pathways. It does not diagnose any condition and does not recommend, prescribe, or determine which peptides you should use. Consult a qualified healthcare provider before beginning any peptide protocol or making changes to your care.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.