TL;DR
Several eye conditions can produce symptoms that look and feel a lot like AMD, or age-related macular degeneration. Blurred central vision, distorted straight lines, difficulty reading and dark patches in the middle of your sight are all hallmarks of AMD, but they can also point to something else entirely. Getting the right diagnosis matters, because the treatment and outlook for each condition can be very different.
Why can macular degeneration be misdiagnosed?
The macula is a tiny area at the centre of the retina, and when it’s damaged or disrupted, the symptoms it produces are surprisingly similar regardless of what’s causing the problem. Whether the issue is fluid build-up, scar tissue, a hole or abnormal blood vessel growth, you’re likely to experience some combination of central blurriness, wavy lines and trouble seeing fine detail.
This means that symptoms alone aren’t enough to tell one macular condition from another. Your eye care professional will rely on imaging tools like optical coherence tomography (OCT), fundus photography and fluorescein angiography to look beneath the surface and work out exactly what’s going on. Without these, it’s easy for one condition to be mistaken for another, particularly in the early stages when changes are subtle.
Central serous retinopathy
Central serous retinopathy (CSR) is one of the conditions most commonly confused with AMD. It happens when fluid builds up beneath the retina, causing a small dome-shaped detachment at the macula. This leads to blurred central vision, distorted images and sometimes a dimming of colours, all of which overlap heavily with the symptoms of wet AMD.
The key difference is who it tends to affect. CSR is most common in younger adults, particularly men in their 30s to 50s, and it’s strongly associated with stress and steroid use. AMD, by contrast, is overwhelmingly a condition of older age.
But when CSR develops in someone over 50, or when it becomes chronic and causes lasting pigment changes at the back of the eye, the overlap with AMD becomes much harder to spot on a standard eye exam. OCT imaging is what separates the two, revealing the distinctive fluid pattern that’s specific to CSR.
The good news is that most cases of CSR resolve on their own within a few months. Chronic or recurring cases may need treatment, but the long-term outlook is generally better than for AMD.
Macular holes
A macular hole is a small break in the macula, and it causes a sudden or rapid decline in central vision. You might notice that reading becomes difficult, straight lines appear bent, or there’s a blank spot right in the middle of your sight. These symptoms are strikingly similar to what you’d experience with macular degeneration.
Macular holes usually develop because of age-related changes to the vitreous, the gel-like substance that fills the inside of the eye. As the vitreous shrinks and pulls away from the retina over time, it can tug on the macula and cause a tear. They’re most common in women over 60, which is the same group most at risk for AMD, adding to the potential for confusion.
The important distinction is that macular holes can often be repaired with surgery. A procedure called a vitrectomy can close the hole and, in many cases, restore a good deal of lost vision. AMD, on the other hand, involves progressive damage to the retinal tissue itself, which can’t currently be reversed. So getting the correct diagnosis has real consequences for what treatment is offered and what outcome you can expect.
Epiretinal membrane (macular pucker)
An epiretinal membrane is a thin sheet of scar-like tissue that forms on the surface of the macula. As this membrane contracts, it wrinkles and distorts the retinal surface beneath it, causing blurred and wavy central vision. If you’ve ever noticed that door frames or text look slightly crooked through one eye, an epiretinal membrane is a possible cause.
Because the symptoms overlap so closely with early AMD, particularly the distortion of straight lines, the two can be mistaken for one another. Epiretinal membranes develop slowly and are often found by chance during routine eye exams, much like early dry AMD.
In mild cases, no treatment is needed. If the membrane is significantly affecting your vision, surgery can remove it and improve things. Unlike AMD, an epiretinal membrane doesn’t involve progressive degeneration of the retinal tissue, so the overall prognosis tends to be better once it’s been identified and managed.
Related read: What Vision Looks Like With Macular Degeneration
Diabetic macular oedema
Diabetic macular oedema (DMO) occurs when diabetes-related damage to the blood vessels in the retina causes fluid to leak into the macula. The resulting swelling leads to blurred central vision that can look a lot like wet AMD, especially on initial examination.
The critical clue is the patient’s medical history. DMO develops in people with diabetic retinopathy, so a known diagnosis of diabetes is usually the first indicator that points away from AMD. But in cases where someone’s diabetes hasn’t yet been diagnosed, or where the eye symptoms appear before other complications, the distinction can be less obvious.
DMO is treated with anti-VEGF injections, the same drugs used for wet AMD, along with careful management of blood sugar, blood pressure and cholesterol. Identifying it correctly is important because the underlying cause, systemic vascular disease from diabetes, requires a very different long-term management approach compared to age-related eye conditions.
Late-onset Stargardt disease
Stargardt disease is an inherited condition that usually appears in childhood or adolescence, but there’s a late-onset form that can develop in adults and closely mimic dry AMD. The yellow-white deposits (called flecks) that accumulate at the back of the eye in Stargardt disease can look remarkably similar to the drusen deposits seen in early AMD.
Late-onset Stargardt is much rarer than AMD, but when it appears in an older adult, the resemblance can be strong enough to lead to a misdiagnosis. Genetic testing and specialised imaging like fundus autofluorescence can help distinguish between the two. This distinction matters because the two conditions have different genetic implications, different rates of progression and different eligibility for emerging treatments.
Why the right diagnosis matters
Each of these conditions affects the macula and produces overlapping symptoms, but they differ in cause, treatment and outlook. A person misdiagnosed with AMD might undergo unnecessary monitoring or miss out on a treatment that could have helped, such as surgery for a macular hole. Equally, someone whose AMD is mistaken for a less serious condition could lose valuable time before starting anti-VEGF therapy.
If you’re experiencing changes in your central vision, such as blurriness, distortion, difficulty reading or a new blind spot, the most important step is to get a thorough eye examination that includes retinal imaging. Symptoms alone can’t give you a reliable answer, but the right diagnostic tools can.
And if you’ve already been diagnosed with AMD but your treatment doesn’t seem to be working as expected, it’s worth asking your specialist whether the diagnosis might need revisiting. A second opinion supported by up-to-date imaging can sometimes reveal that the real culprit is one of the conditions described above.
