TL;DR
You’ve gone for a routine eye test and the optometrist mentions something called drusen. Naturally, a quick search connects them to age-related macular degeneration (AMD), and it’s easy to assume the worst. But having drusen doesn’t automatically mean you have AMD or that you’ll develop it. In many cases, small drusen are a normal part of how the eye ages and don’t pose a threat to your sight.
That said, the type, size and number of drusen do matter. Some are harmless. Others signal that changes are happening in the retina that need monitoring.
What are drusen?
Drusen are tiny yellow or white deposits that build up beneath the retina. They sit between a layer called Bruch’s membrane and the retinal pigment epithelium (RPE), which is the support layer that keeps the light-sensitive cells in your retina healthy.
They’re made up of a mixture of proteins, lipids and other cellular waste products. As the eye ages, its waste-clearing mechanisms become less efficient, and this debris starts to accumulate. Think of it as a slow build-up of material that the eye can no longer fully clear away.Drusen increase a person’s risk of AMD, but they likely don’t cause the condition directly. Most people over 40 have at least a few.
Hard drusen vs. soft drusen
Not all drusen carry the same level of risk, and the distinction between types is what matters most.
Hard drusen
Hard drusen are small (under 63 micrometres in diameter), with well-defined, sharp edges. They’re scattered across the retina and, according to the Beaver Dam Eye Study, are found in around 93.6% of people between the ages of 43 and 86. At this size and frequency, hard drusen are considered a normal sign of ageing.
On their own, they carry a very low risk of progressing to AMD. Data from the same study puts the five-year progression rate at just 0.4% for people with small hard drusen and no pigmentary changes.
Soft drusen
Soft drusen are larger (over 63 micrometres), with fuzzy, ill-defined edges. They tend to cluster together and can merge into even bigger deposits. These are the type most closely associated with AMD.
When soft drusen are present alongside pigment changes in the retina, the risk of progression to advanced AMD increases considerably.
So when are drusen just a sign of ageing?
If your eye test reveals a small number of hard drusen, with no pigment changes and no other abnormalities, that’s generally considered a normal finding for your age. You don’t have AMD at that point, and the chance of developing it from hard drusen alone is very low.
This is reassuring for the large number of people who hear the word “drusen” for the first time and immediately worry. Many optometrists will simply note the finding and recommend continuing with regular eye tests. There’s usually nothing else that needs to happen.
However, drusen can change over time. Hard drusen can grow larger and merge into soft drusen. That transition is what tips the balance from normal ageing towards early AMD. This is one reason why regular monitoring matters, even if your current drusen look harmless.
Related read: How To Prevent Macular Degeneration
When drusen signal early AMD
Your optometrist or ophthalmologist will classify the findings based on drusen size, number and whether there are accompanying changes in the RPE (like areas of hyper- or hypopigmentation).
Under the widely used Beckman classification system, the presence of medium drusen (63 to 125 micrometres) without pigment changes is classed as early AMD. Large drusen (over 125 micrometres) or pigment abnormalities put you into the intermediate AMD category. That intermediate stage is where the risk of progression to advanced AMD becomes more significant, and it’s also the stage where AREDS2 supplements have been shown to reduce that risk by about 25%.
If you’ve been told you have early or intermediate AMD, it doesn’t mean you’ll lose your sight. It means the condition is being watched and that steps can be taken to slow it down.
What you can do if drusen are found
Whether your drusen are classified as normal or as early AMD, there are practical steps worth taking.
- Keep up with regular eye tests. This is the most effective way to track any changes. Your optometrist can compare images of your retina over time and spot progression before it causes symptoms. Adults over 50 should be tested at least every two years, or more often if advised.
- Pay attention to your diet. The nutrients that support macular health are well documented. Lutein and zeaxanthin, found in leafy greens and eggs, accumulate in the macula and help filter damaging light. Omega-3 fatty acids from oily fish support the retina’s structure, and vitamins C and E help combat oxidative stress.
- Stop smoking if you currently do. Smoking significantly increases the risk of AMD progression and is one of the most modifiable risk factors. Wear UV-protective sunglasses to shield your eyes from further oxidative damage.
- If you’ve been diagnosed with intermediate AMD, speak to your optometrist about whether an AREDS2-based supplement would be appropriate for you.
Monitor your vision at home
Between eye tests, you can keep an eye on changes yourself using an Amsler grid, which is a simple chart of horizontal and vertical lines. If straight lines start to look wavy, or if you notice a blank or dark spot in the centre of the grid, contact your optometrist promptly.
These changes can indicate that drusen-related damage is affecting the macula.The bottom line is this: drusen don’t always mean macular degeneration. Small, hard drusen are a normal part of ageing for most people. But they’re worth monitoring, because they can change, and catching that change early makes all the difference.
