Laboratory Studies
No laboratory studies assist in the diagnosis of AMD.
Imaging Studies
After a thorough dilated examination of the fundus with slit lamp biomicroscopy, stereo color photography of the fundus, rapid-sequence fluorescein angiography (FA), and optical coherence tomography (OCT) are performed on many patients with signs and symptoms of exudative AMD.
FA is an office-based procedure to help identify and confirm the source of the CNV. During the procedure, fluorescein dye is injected intravenously and serial photographs of the retina are taken to document the progression of the dye through the choroidal and retinal vasculature. Abnormalities are identified in areas where the dye collects (hyperfluorescence) or is absent (hypofluorescence).
Findings on FA consistent with exudative AMD include the following: increasing hyperfluorescence secondary to dye leakage from the CNV and hypofluorescent blockage from subretinal hemorrhage. Additional findings consistent with any form of AMD include the following: hyperfluorescence of drusen and RPE atrophy and hypofluorescence from RPE hypertrophy. See the images below.
Color photograph of the fundus shows nonexudative age-related macular degeneration (AMD) with geographic atrophy of the retinal pigment epithelium (RPE) and drusen. Absolute atrophy of the RPE occupies the foveal region in this case of nonexudative AMD. The central atrophic region causes a corresponding central scotoma. Note the large choroidal vessels, which are visible through the RPE defect. Drusen surround the region of geographic atrophy. Photo by Tim Steffens.
Late-frame fluorescein angiogram shows nonexudative age-related macular degeneration (AMD) with geographic atrophy of the retinal pigment epithelium (RPE) and drusen from the case of geographic atrophy illustrated in the image above. Geographic atrophy stains intensely with distinct borders, but no leakage is present to suggest a choroidal neovascular membrane (CNVM). Stain highlights the large choroidal vessels in the region of atrophy well. Photo by Tim Steffens.
Midframe from the fluorescein angiogram of the case in the image above reveals the discrete region of hyperfluorescence, which is characteristic of a classic choroidal neovascular membrane (CNVM). Late frames of the angiogram (not shown) revealed intense leakage from the CNVM. Subretinal hemorrhage is more commonly due to classic CNVM than occult CNVM and typically occurs along the peripheral aspect of the CNVM. Photo by Tim Steffens.
Color photograph of the fundus shows a retinal pigment epithelium (RPE) tear. The RPE has torn from the nasal portion of the macula and assumed a scrolled, redundant configuration in the temporal portion of the macula. Associated sub-RPE and subretinal hemorrhage is present, as are hard exudates and subretinal fluid. Courtesy of Albert R. Frederick, Jr, MD.
Early-frame fluorescein angiogram shows a retinal pigment epithelium (RPE) tear. Fluorescein angiogram from the case illustrated in the image above temporally shows blockage of the choroidal flush by the redundant, scrolled RPE. Stained areas represent where the RPE was torn. Later frames of the angiogram (not shown) also showed leakage due to the associated choroidal neovascular membrane (CNVM). Courtesy of Albert R. Frederick, Jr, MD. A disciform scar, which is the end stage of exudative AMD, is hyperfluorescent from fluorescein staining. Depending on the distance from the foveal avascular zone, the leakage is classified as subfoveal, juxtafoveal (1-199 µm), or extrafoveal (200-250 µm). CNV is sometimes defined as classic or occult based on the FA leakage pattern.
Classic CNV results in discrete and early hyperfluorescence with late leakage of fluorescein dye into the surrounding interstitial spaces. See the images below.
Color photograph of the fundus shows classic choroidal neovascular membrane (CNVM) causing subretinal hemorrhage. Subretinal hemorrhage, which resulted from a classic CNVM, occupies the foveal region, causing a dense central scotoma. The subretinal hemorrhage can be large, mimicking a choroidal melanoma. On occasion, the subretinal hemorrhage can break through the retina, causing a vitreous hemorrhage. Patients who present with vitreous hemorrhage and evidence of age-related macular degeneration (AMD) in the other eye should be thought to have a CNVM, especially if they have no history of diabetes or other causes of vitreous hemorrhage. Photo by Tim Steffens.
Late-frame fluorescein angiogram. Classic choroidal neovascular membrane (CNVM) before laser photocoagulation shows classic CNVM, which manifests as a discrete, early focus of hyperfluorescence with late leakage. Associated subretinal hemorrhage at the peripheral edge of the CNVM blocks the underlying choroidal flush. Photo by Tim Steffens.
Early-frame fluorescein angiogram shows classic choroidal neovascular membrane (CNVM) after laser photocoagulation. Classic CNVM illustrated in the image above was photocoagulated. The patient underwent repeat fluorescein angiography (image shown here) 2 weeks later to rule out persistence. Note nonperfusion of the choriocapillaris and CNVM in the laser scar. Photo by Tim Steffens. Occult CNV is categorized into 2 basic forms, as follows: late leakage of undetermined source or fibrovascular PED. Both forms manifest as a region of ill-defined leakage in the early and late frames without a distinct source of leakage. See the images below.
Midframe fluorescein angiogram shows classic plus occult choroidal neovascular membrane (CNVM). Temporal to the foveal region, image reveals a discrete region of hyperfluorescence that is suggestive of a classic CNVM. Photo by Tim Steffens.
Late-frame fluorescein angiogram shows classic plus occult choroidal neovascular membrane (CNVM). Late frames of the angiogram from the case in the image above show leakage from the discrete focus (seen in early frames). This finding is characteristic of the classic component. The surrounding late-stippled leakage is characteristic of the occult component. Photo by Tim Steffens. When a treatment other than a vascular endothelial growth factor (VEGF) inhibitor is planned, angiography is customarily performed within 72 hours of treatment because the morphology and resulting treatment parameters can evolve rapidly.
Indocyanine green (ICG) angiography can be performed as an adjunctive study in patients with subretinal hemorrhage, suspected retinal angiomatous proliferation, or polypoidal choroidal vasculopathy.
The near-infrared light (795-810 nm) absorbed by ICG tends to penetrate hemorrhage and RPE better than the shorter wavelength that is absorbed by fluorescein.
Unlike fluorescein, ICG is strongly bound to plasma proteins, which prevents diffusion of the compound through the normally fenestrated choroidal capillaries and improves delineation of choroidal detail.[50]
Optical coherence tomography (OCT) is a useful noninvasive adjunct for identifying retinal and subretinal pathology secondary to CNV. OCT provides a cross-sectional view of the retina with an axial resolution of about 4 µm. OCT can identify soft drusen, RPE detachments, subretinal and intraretinal fluid, CNV, cystoid macular edema, as well as the integrity of the photoreceptor and RPE layers.[51, 52, 53, 54] OCT is useful for monitoring therapeutic response.[53, 55, 56]
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