Drusen are small yellow or white deposits that build up beneath the retina, the light-sensitive tissue at the back of your eye. They form when cellular waste products, primarily lipids and proteins, accumulate between the retinal pigment epithelium (a support layer for your retina) and the blood supply underneath it. Nearly everyone develops at least a few small drusen with age, but their size, type, and location determine whether they pose a risk to your vision. AMD prevalence rises from about 2% in people aged 40 to 44 up to nearly 47% in those 85 and older.
How Drusen Form
Your retina constantly processes light, and that work generates waste. A single layer of cells called the retinal pigment epithelium, or RPE, sits beneath the retina and acts as both a recycling center and a barrier. It breaks down spent photoreceptor material and shuttles nutrients from the blood supply below. When this system slows down, waste products start piling up between the RPE and the underlying blood vessels.
These deposits contain a complex mix of lipids, sugars, and well over a hundred different proteins. Among the most common are proteins involved in tissue remodeling and immune signaling. Many of these proteins show signs of oxidative damage, meaning they’ve been chemically altered by reactive molecules. One particularly telling modification comes specifically from the breakdown of a fatty acid concentrated in retinal cells, linking drusen formation directly to the eye’s unique metabolic activity.
Once drusen reach a certain size, they may physically block the flow of oxygen and nutrients from the blood vessels to the retina. This creates a damaging cycle: the RPE becomes more dysfunctional, generates more waste, and the immune system sends inflammatory cells to try to clean up the debris. That inflammatory response can itself harm healthy tissue nearby, accelerating the problem rather than solving it.
Hard Drusen vs. Soft Drusen
Not all drusen carry the same risk. The two main types differ in structure, appearance, and what they mean for your eye health.
Hard drusen are small, round, dome-shaped deposits with sharp, well-defined borders. Their contents are solid and compacted. Most adults develop scattered hard drusen as they age, and a few of them on their own are generally harmless. However, when numerous hard drusen cluster in the macula (the central part of the retina responsible for sharp vision), they increase the likelihood that soft drusen and pigment changes will follow.
Soft drusen are larger, with fuzzy, poorly defined edges. Their contents are loose and granular rather than solid, and they tend to merge with a layer of debris that spreads along the base of the RPE. Researchers consider soft drusen the most consequential deposits visible during an eye exam. Eyes with large soft drusen face a significantly higher risk of progressing to advanced macular degeneration, including both the “wet” form (where abnormal blood vessels grow beneath the retina) and the “dry” form (where the RPE gradually wastes away). Soft drusen appear almost exclusively in the macula, which helps explain why this small area is so vulnerable to vision loss even though drusen can occur throughout the retina.
Size Thresholds and Risk
Eye doctors classify drusen into three size categories. Small drusen are less than 62 microns across, roughly the width of a fine human hair. Intermediate drusen measure 63 to 124 microns. Large drusen are 125 microns or bigger.
Size matters because it directly predicts progression. Having even one large druse in the central 1,000 microns of the macula roughly triples the odds of developing advanced AMD, based on data from the major Age-Related Eye Disease Study (AREDS). When the area of drusen in the central macula equals or exceeds the equivalent of five large drusen combined, the odds climb to nearly five times higher. Other factors that compound the risk include pigment changes in the RPE and whether the other eye is already affected, which alone can increase the odds four to six times.
What Drusen Feel Like
Small and intermediate drusen typically cause no symptoms at all. Most people learn they have drusen only during a routine eye exam. As deposits grow larger or more numerous, you may notice subtle changes: difficulty reading in dim light, slower adjustment when moving between bright and dark environments, or a slight blur in the center of your vision.
If drusen contribute to the progression toward advanced macular degeneration, more noticeable symptoms can develop. One of these is metamorphopsia, a visual distortion that makes straight lines appear wavy or objects look warped, as if you’re peering through someone else’s glasses. Some people notice that objects seem slightly larger, smaller, or misshapen. These distortions may affect a small area of your central vision or a wider portion of it, and they tend to be more prominent in wet AMD.
How Drusen Are Detected
During a dilated eye exam, drusen appear as yellowish spots on the retina. Your eye doctor can see them directly, but imaging technology provides a much more detailed picture.
Optical coherence tomography, or OCT, uses light waves to create cross-sectional images of the retina, almost like an ultrasound but with higher resolution. On OCT scans, different drusen types have distinct signatures. Soft, cuticular, and calcified drusen all produce a characteristic “donut sign,” a round shape with a dark center and a bright ring around it. Calcified drusen cast a dense shadow on deeper layers, while soft drusen only faintly dim the signal below them. Subretinal drusenoid deposits, a newer recognized type that sits above rather than below the RPE, show up as small dots or worm-like ribbons in the outer retina.
Fundus autofluorescence is another imaging tool that captures the natural glow of certain molecules in the RPE. It helps reveal pigment changes and patterns of deposit distribution that might not be obvious on standard photographs.
Optic Disc Drusen Are Different
Drusen can also form in the optic disc, the spot where the optic nerve connects to the retina. Despite sharing a name, optic disc drusen are a distinct condition. These deposits are made of fatty proteins and calcium that harden over time, and their cause is largely unknown, though some cases run in families.
Optic disc drusen affect about 1% to 2% of the U.S. population and are more common in white individuals. About 75% of cases involve both eyes. Around 87% of people with optic disc drusen experience some degree of visual field loss, typically in the peripheral vision rather than the center. Unlike macular drusen, optic disc drusen are not linked to macular degeneration.
Monitoring and Follow-Up Schedules
How often you need to be checked depends on the stage of disease. The American Academy of Ophthalmology recommends return visits every 6 to 24 months for early AMD (small to medium drusen with no pigment changes) when you have no symptoms. If you have intermediate AMD, with large drusen or pigment abnormalities, the window tightens to every 6 to 18 months, and you should monitor your vision at home using an Amsler grid, a simple checkerboard pattern that helps you notice new distortions or blind spots.
At any stage, new symptoms like sudden blurriness, wavy lines, or a dark spot in your central vision warrant a prompt exam rather than waiting for your next scheduled visit. These can signal the growth of abnormal blood vessels, which requires treatment quickly to preserve vision.
Slowing Progression With Nutrition
For people with intermediate or advanced AMD in one eye, a specific supplement formula has been shown to reduce the risk of progressing to advanced disease. The AREDS2 formula, developed through clinical trials funded by the National Eye Institute, contains 500 mg of vitamin C, 400 IU of vitamin E, 10 mg of lutein, 2 mg of zeaxanthin, 80 mg of zinc, and 2 mg of copper (added to prevent zinc-related copper deficiency). Lutein and zeaxanthin replaced beta-carotene from the original formula because beta-carotene was linked to increased lung cancer risk in smokers.
These supplements are widely available over the counter. They are not beneficial for people who have only small drusen and no other signs of AMD. The evidence supports their use specifically for intermediate and advanced stages, so your eye doctor’s assessment of your drusen size and stage determines whether they’re appropriate for you.