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Geographic atrophy
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From Detection to Progression
Imaging plays a critical role in both early diagnosis of GA and in the monitoring of disease progression.
Diagnostic Hallmarks of Dry AMD
Early
Multiple small (<63 µm) and few intermediate (63-124 µm) drusen, or RPE abnormalities.1-3
Intermediate
Extensive intermediate drusen (63-124 µm) or more than 1 large druse (≥125 µm). May also be accompanied by pigmentary and degenerative changes in the choriocapillaris, RPE, and photoreceptors.1-4
Advanced (GA)
Progressive atrophy of choriocapillaris,
RPE, and photoreceptors.2,3 As well as new and growing lesions.3
Optical Coherence
Tomography (OCT)
Key Features1,4
- (1) Degeneration of overlying photoreceptors increases reflectivity below Bruch’s membrane
- (2) Hyperreflective foci corresponds to attenuation or disruption of the RPE
- (3) Atrophy of the RPE
- (4) Area of choroidal hypertransmission
Images are from separate patients.
Color Fundus Photography
(CFP)
Key Features4-6
- (1) Drusen and
- (2) hyperpigmentary RPE abnormalities
- (3) GA lesion borders are sharply demarcated with increased choroidal vessel visibility (dashed circle)
Images are from separate patients.
Fundus Autofluorescence
(FAF)
Key Features1,8
- (1) Reticular pseudodrusen appearing as multiple, clustered, regularly networked, round areas of low-contrast hypo-autofluorescence may be prognostic of advancing AMD
- (2) Abnormal patterns of
hyperautofluorescence surrounding atrophic lesions - (3) Areas of hypoautofluorescence with sharply demarcated borders
indicate atrophic lesions
Images are from separate patients.
References
- Holz FG, Schmitz-Valckenberg S, Fleckenstein M. Recent developments in the treatment of age-related macular degeneration. J Clin Invest. 2014;124(4):1430-1438.
- Boyer DS, Schmidt-Erfurth U, van Lookeren Campagne M, Henry EC, Brittain C. The pathophysiology of geographic atrophy secondary to age-related macular degeneration and the complement pathway as a therapeutic target. Retina. 2017;37(5):819-835.
- Fleckenstein M, Mitchell P, Freund KB, et al. The progression of geographic atrophy secondary to age-related macular degeneration. Ophthalmology. 2018;125(3):369-390.
- Sadda SR, Chakravarthy U, Birch DG, et al. Clinical endpoints for the study of geographic atrophy secondary to age-related macular degeneration. Retina. 2016;36(10):1806-1822.
- Monés J, Garcia M, Biarnés M, Lakkaraju A, Ferraro L. Drusen ooze: a novel hypothesis in geographic atrophy. Ophthalmol Retina. 2017;1(6):461-473.
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- Ambati J, Ambati BK, Yoo SH, Ianchulev S, Adamis AP. Age-related macular degeneration: etiology, pathogenesis, and therapeutic strategies. Surv Ophthalmol. 2003;48(3):257-293.
- Flaxel CJ, Adelman RA, Bailey ST, et al. Age-related macular degeneration preferred practice pattern(R). Ophthalmology. 2020;127(1):P1-P65.
- Sunness JS, Rubin GS, Applegate CA, et al. Visual function abnormalities and prognosis in eyes with age-related geographic atrophy of the macula and good visual acuity. Ophthalmology. 1997;104(10):1677-1691.
- Lindblad AS, Lloyd, PC, Clemons TE, et al. Change in area of geographic atrophy in the Age-Related Eye Disease Study: AREDS report number 26. Arch Ophthalmol. 2009;127(9):1168-1174.
- Holz FG, Strauss EC, Schmitz-Valckenberg S, van Lookeren Campagne M. Geographic atrophy: clinical features and potential therapeutic approaches. Ophthalmology. 2014;121(5):1079-1091.
- Desai D, Dugel PU. Complement cascade inhibition in geographic atrophy: a review. Eye (Lond). 2022;36(2):294-302.
- Bakri SJ, Bektas M, Sharp D, Luo R, Sarda SP, Khan S. Geographic atrophy: mechanism of disease, pathophysiology, and role of the complement system. J Manag Care Spec Pharm. 2023;29(5-a Suppl):S2-S11.
- Carlton J, Barnes S, Haywood A. Patient perspectives in geographic atrophy (GA): exploratory qualitative research to understand the impact of GA for patients and their families. Br Ir Orthopt J. 2019;15(1):133-141.
- Stahl A. The diagnosis and treatment of age-related macular degeneration. Dtsch Arztebl Int. 2020;117(29-30):513-520.
- Sayegh RG, Sacu S, Dunavölgyi R, et al. Geographic atrophy and foveal-sparing changes related to visual acuity in patients with dry age-related macular degeneration over time. Am J Ophthalmol. 2017;179:118-128.
- Chakravarthy U, Bailey CC, Johnston RL, et al. Characterizing disease burden and progression of geographic atrophy secondary to age-related macular degeneration. Ophthalmology. 2018;125(6):842-849.
- Patel PJ, Ziemssen F, Ng E, et al. Burden of illness in geographic atrophy: a study of vision-related quality of life and health care resource use. Clin Ophthalmol. 2020;14:15-28.
- Singh RP, Patel SS, Nielsen JS, Schmier JK, Rajput Y. Patient-, caregiver-, and eye care professional-reported burden of geographic atrophy secondary to age-related macular degeneration. Am J Ophthalmic Clin Trials. 2019;2(1):1-6.
- Sivaprasad S, Tschosik EA, Guymer RH, et al. Living with geographic atrophy: an ethnographic study. Ophthalmol Ther. 2019;8(1):115-124.
- Higgins BE, Taylor DJ, Binns AM, Crabb DP. Are current methods of measuring dark adaptation effective in detecting the onset and progression of age-related macular degeneration? A systematic literature review. Ophthalmol Ther. 2021;10(1):21-38.
- Meleth AD, Mettu P, Agron E, et al. Changes in retinal sensitivity in geographic atrophy progression as measured by microperimetry. Invest Ophthalmol Vis Sci. 2011;52(2):1119-1126.
- Xu H, Chen M. Targeting the complement system for the management of retinal inflammatory and degenerative diseases. Eur J Pharmacol. 2016;787:94-104.
- Coulthard LG, Woodruff TM. Is the complement activation product C3a a proinflammatory molecule? Re-evaluating the evidence and the myth. J Immunol. 2015;194(8):3542-3548.
- Xie CB, Jane-Wit D, Pober JS. Complement membrane attack complex: new roles, mechanisms of action, and therapeutic targets. Am J Pathol. 2020;190(6):1138-1150.
- Brandstetter C, Holz FG, Krohne TU. Complement component C5a primes retinal pigment epithelial cells for inflammasome activation by lipofuscin-mediated photooxidative damage. J Biol Chem. 2015;290(52):31189-31198.
- Kumar-Singh R. The role of complement membrane attack complex in dry and wet AMD – from hypothesis to clinical trials. Exp Eye Res. 2019;184:266-277.