Family History and Eye Disease: What You Inherit and What You Control

Patients often tell us their mother or father "went blind from macular degeneration" and ask whether the same is coming for them. It is a fair question, and the answer is more hopeful than most expect.

What the Genetics Show

Age-related macular degeneration has a strong hereditary component. Having a parent or sibling with AMD increases your risk several-fold, and variants in genes of the complement pathway, notably CFH and ARMS2/HTRA1, account for a substantial share of that risk.

But genes are probabilities, not verdicts. Plenty of people with high-risk variants never develop advanced disease, and plenty without family history do. Environment and behavior — especially smoking and cardiovascular health — interact powerfully with genetic risk.

Other Conditions With Family Patterns

• Glaucoma — first-degree relatives have several times the risk; screening should start earlier
• Diabetes and therefore diabetic retinopathy
• High myopia, which raises risk of retinal tears, detachment, and myopic degeneration
• Retinal detachment — a family history in a highly myopic family warrants awareness of symptoms
• Inherited retinal dystrophies such as retinitis pigmentosa and Stargardt disease, which follow clearer inheritance patterns and now have emerging gene-based therapies

Should You Have Genetic Testing for AMD?

For most patients, no. Commercially available AMD genetic tests do not currently change management: the recommendations — do not smoke, control blood pressure, eat well, protect from UV, monitor with an Amsler grid, and have regular dilated exams — are the same regardless of the result. Major ophthalmology organizations do not recommend routine genetic testing for typical AMD.

Testing is valuable for suspected inherited retinal dystrophies, where a specific diagnosis guides prognosis, family counseling, and eligibility for gene therapy and clinical trials.

What to Tell Your Family

If you have AMD or another retinal condition, tell your siblings and adult children. Ask them to:

• Have a dilated eye exam and mention the family history
• Start screening earlier than they otherwise would — often in their 50s for AMD
• Not smoke, which is the single largest modifiable multiplier of genetic risk
• Manage blood pressure, cholesterol, and weight
• Wear UV400 sunglasses
• Report distortion or central blur promptly

Build a Family Eye History

Write down who had what condition, at what age, and how it was treated. Bring it to your appointments. It is one of the most useful pieces of information you can give any eye doctor, and it takes ten minutes to assemble.

To discuss your family history with a retina specialist, call (954) 633-8202.