Macular Degeneration: Risk Factors, Prevention, and Early Detection

What Is the Macula?

The macula is a small, specialized area at the center of the retina responsible for sharp, detailed central vision — the vision you use for reading, recognizing faces, and driving. Age-related macular degeneration (AMD) occurs when the tissue in this area deteriorates over time.

Dry vs. Wet AMD

Dry AMD is by far the more common form, accounting for roughly 85-90% of cases. It progresses slowly as small deposits called drusen accumulate beneath the retina. Central vision gradually becomes blurry or distorted. There is currently no FDA-approved treatment for early dry AMD, making prevention and monitoring the cornerstones of management.

Wet AMD is less common but more aggressive. Abnormal blood vessels grow beneath the retina and leak fluid, causing rapid central vision loss. Wet AMD is a medical emergency — treatment with anti-VEGF injections must begin quickly to preserve vision.

Risk Factors You Should Know

• Age — risk increases significantly after 55
• Smoking — the single most modifiable risk factor; smokers have 2-4x the risk of AMD
• Family history — AMD has a strong genetic component
• Cardiovascular disease and high blood pressure
• Light-colored eyes — less protective pigment
• Prolonged UV exposure without protective eyewear

What You Can Do

Stop smoking. If there is one intervention that matters most for AMD prevention, this is it. The evidence is overwhelming and consistent across decades of research.

Eat a diet rich in leafy greens. Lutein and zeaxanthin — found in spinach, kale, and eggs — are antioxidants that concentrate in the macula and appear to offer some protective benefit. The AREDS2 supplement formula has been shown to slow progression in patients with intermediate AMD.

Wear UV-protective sunglasses. Cumulative UV damage is a contributing factor. Wrap-around sunglasses with 100% UV protection are ideal.

Monitor your central vision at home. An Amsler grid — a simple pattern of lines — can help you detect subtle distortions in central vision that may indicate early wet AMD. We provide these to patients at risk.

Why Regular Exams Matter

AMD in its early stages causes no symptoms. By the time most patients notice something wrong, significant damage may already have occurred. At Harnos Optometry, we use high-resolution retinal imaging to document the health of your macula over time and compare year-over-year changes — often detecting AMD long before it affects your vision.