How Is Dry AMD Diagnosed and Monitored?

What is the Role of Optical Coherence Tomography (OCT) in AMD Tracking?

OCT is the most critical tool for managing AMD, providing a cross-sectional view of the retinal layers. The scan allows doctors to measure the thickness of the macula and identify "pre-retinal" fluid that signals a conversion to the wet form. In dry AMD, OCT is used to track the slow loss of the support cells (RPE) and the expansion of geographic atrophy. The precision of OCT allows for the detection of changes as small as a few microns, ensuring that medical intervention can be timed perfectly.

How Do Fundus Photography and Autofluorescence Map Tissue Death?

Fundus photography provides a high-resolution color baseline of the retina to document the size and location of drusen. Fundus Autofluorescence (FAF) is a specialized imaging technique that uses the eye's natural pigments to light up areas of healthy and dying tissue. On an FAF scan, areas of geographic atrophy appear as "dark holes," allowing the doctor to measure exactly how much of the central vision is at risk. These images are essential for determining if a patient is a candidate for the new "complement-inhibitor" injection therapies.

Why is the Amsler Grid the Most Important Home Monitoring Tool?

The Amsler Grid is a simple square of graph paper that allows patients to monitor their own vision daily between office visits. Patients are taught to look at the center dot and check for any lines that appear wavy, distorted, or missing. Because the brain can "hide" small visual gaps, the Amsler Grid forces each eye to identify its own defects. A "positive" change on the grid is a clinical emergency, as it often indicates that fluid has suddenly leaked into the macula, requiring immediate treatment.

What is the Role of Genetic Testing in Predicting AMD Severity?

Genetic testing panels can identify specific markers, such as the CFH and ARMS2 genes, which are linked to a higher risk of rapid AMD progression. While not needed for everyone, genetic data can help clinicians decide which patients require more frequent monitoring or a higher dose of supplements. It also provides valuable information for family members who may be at an increased risk of developing the disease earlier in life. Personalized risk profiling is becoming a standard part of advanced retinal care in 2026.

How Do Functional Tests Like Dark Adaptation Detect Early AMD?

Difficulty seeing in low light is often the very first symptom of dry AMD, occurring years before a patient fails a standard vision chart. Dark adaptation testing measures how long it takes the eye to recover its sensitivity after a bright flash of light. A delayed recovery time is a highly sensitive clinical marker for the early stages of RPE dysfunction. Identifying this "functional loss" early allows patients to start lifestyle changes and supplements while their daylight vision is still perfect.