Wet macular degeneration is confirmed through an eye examination and detailed images of the retina, the light-sensitive layer at the back of the eye. An ophthalmologist looks for abnormal blood vessels, bleeding, or fluid around the macula, the area used for sharp central vision. Optical coherence tomography (OCT) is commonly used; dye-based angiography or OCT angiography may be added when more detail is needed.
What tests confirm wet macular degeneration?
Eye specialists use a combination of examination findings and imaging to determine whether someone has wet age-related macular degeneration (AMD). The main goal is to identify abnormal blood vessels in or beneath the macula and look for signs that they are leaking fluid or blood. These changes can affect the structure of the retina and interfere with central vision.
The American Society of Retina Specialists explains that diagnosis involves a clinical examination and may include optical coherence tomography, fluorescein angiography, indocyanine green angiography, or OCT angiography. Not everyone needs every test. The eye specialist selects the appropriate investigations according to the examination findings and the images available.
What happens during the eye examination?
The appointment usually begins with questions about changes in vision, when they started, and whether they have affected one or both eyes. The eye specialist may also review previous eye conditions, family history, and earlier examination results. Visual acuity testing helps assess how clearly a person can see, while other checks help identify changes that need closer examination.
A dilated eye examination is an important part of the process. The clinician puts drops into the eyes to widen the pupils, making it easier to view the retina and macula. Using a specialized instrument, the clinician looks for deposits, changes in retinal tissue, bleeding, and other findings that could point to macular disease. The Mayo Clinic's diagnostic guidance describes this examination as part of the assessment for wet macular degeneration.
The examination may also include an Amsler grid, a pattern of straight lines used to assess central vision. The clinician may ask whether any lines appear bent, broken, or missing. This test helps identify visual changes, but it does not confirm wet macular degeneration on its own. The diagnosis depends on the overall clinical findings and appropriate retinal imaging.
How does an OCT scan identify wet macular degeneration?
Optical coherence tomography, commonly called OCT, is one of the main imaging tests used to investigate suspected wet macular degeneration. It uses light to create detailed cross-sectional images of the retina. The scan is noninvasive and usually does not require an injected dye. It allows the specialist to examine the different retinal layers and look for changes that may not be clear during a routine examination.
On an OCT scan, the clinician looks for signs such as fluid within or beneath the retina, swelling, and changes in the normal arrangement of retinal layers. These findings can be associated with leakage from abnormal blood vessels. The scan also helps the specialist assess where the changes are occurring and whether further imaging is needed to clarify the diagnosis.
The National Institute for Health and Care Excellence (NICE) recommends OCT for people with suspected active wet AMD. It also advises against routinely using fluorescein angiography when the clinical examination and OCT have excluded abnormal new blood vessels. This illustrates why additional tests are chosen according to the information already obtained rather than automatically performed for everyone.
When is retinal angiography needed?
If the examination and OCT do not provide enough information, the eye specialist may recommend a test that shows the retinal blood vessels more directly. These tests can help identify abnormal vessel growth, locate leakage, or clarify findings that are difficult to interpret. The choice depends on the suspected pattern of disease and whether the additional information is likely to assist diagnosis or care.
Fluorescein angiography
During fluorescein angiography, a special yellow dye is injected into a vein, usually in the arm. As the dye travels through the bloodstream and reaches the retinal blood vessels, a specialized camera takes a series of photographs. The images can reveal abnormal blood vessels and areas where dye leaks from the vessels, helping the specialist assess signs associated with wet macular degeneration.
Indocyanine green angiography
Indocyanine green angiography uses a different injected dye to produce images of blood vessels, including vessels in deeper layers behind the retina. It may be useful when the specialist needs more information about the underlying blood vessels or when other imaging leaves an important question unanswered. It is a specialized test rather than a necessary step for every suspected case.
OCT angiography
OCT angiography, or OCTA, combines detailed retinal imaging with information about blood flow. Unlike fluorescein and indocyanine green angiography, it does not require an injected dye. It can help reveal abnormal blood vessel networks in and beneath the retina. The American Academy of Ophthalmology describes OCTA as another way to examine the blood vessels associated with macular degeneration.
How do doctors distinguish wet AMD from dry AMD?
Both wet and dry age-related macular degeneration affect the macula, but their retinal changes differ. Dry AMD is commonly associated with deposits called drusen and, in later disease, areas where light-sensitive cells have been lost. Wet AMD involves abnormal blood vessel growth that can lead to fluid leakage or bleeding. The specialist considers these differences when reviewing examination findings and scans.
Finding drusen does not, by itself, establish that the disease is wet. Similarly, changes in central vision do not reveal the exact cause without further assessment. In some cases, retinal swelling or bleeding can have causes other than wet AMD, so the specialist may need to consider other eye conditions before confirming the diagnosis.
The final conclusion is based on the overall pattern of findings, including whether abnormal blood vessels are present and whether there is evidence of leakage or related retinal damage. When results are unclear, the eye specialist may arrange further imaging or seek an assessment from a clinician who specializes in retinal diseases.
How quickly should suspected wet macular degeneration be assessed?
New distortion of straight lines, a new blurry area in central vision, or a sudden change in vision deserves prompt assessment by an eye-care professional. These experiences can occur with wet AMD, although they can also have other causes. It is not necessary to wait until vision loss becomes pronounced before seeking an examination.
The National Eye Institute identifies wavy or crooked straight lines as a warning sign of late AMD and advises people who notice this change to see an eye doctor right away. NICE recommends urgent referral, normally within one working day, when active wet AMD is suspected. Local referral pathways may differ, but prompt assessment helps avoid unnecessary delays in confirming the cause.
What should you expect after the tests?
After examining the results, the eye specialist should explain whether the findings support wet macular degeneration, whether additional tests are needed, and what the next steps are. If the diagnosis is confirmed, the clinician can discuss appropriate treatment options and how the eyes will be monitored over time. Asking which findings led to the conclusion can help make the results easier to understand.
Dilating drops can cause blurred vision and increased sensitivity to light for a few hours. The NHS guidance on AMD diagnosis notes that these effects can last for several hours. Bringing sunglasses and arranging transport when needed may make the journey home more comfortable. Follow the clinic's instructions about driving after the examination.
Wet macular degeneration is not confirmed by symptoms alone or by a single home vision test. A dilated eye examination combined with OCT and, when indicated, other retinal imaging provides the information clinicians need to establish the diagnosis and decide whether further assessment or treatment is appropriate.