Natural history of central sparing in geographic atrophy secondary to non-exudative age-related macular degeneration.

Journal Article (Journal Article)

BACKGROUND: The macular central 1 mm diameter zone is crucial to patients' visual acuity, but the long-term natural history of central sparing in eyes with geographic atrophy (GA) is unknown. METHODS: We manually segmented GA in 210 eyes with GA involving central 1 mm diameter zone (mean follow-up=3.8 years) in the Age-Related Eye Disease Study. We measured the residual area in central 1 mm diameter zone and calculated central residual effective radius (CRER) as square root of (residual area/π). A linear mixed-effects model was used to model residual size over time. We added a horizontal translation factor to each data set to account for different durations of GA involving the central zone. RESULTS: The decline rate of central residual area was associated with baseline residual area (p=0.008), but a transformation from central residual area to CRER eliminated this relationship (p=0.51). After the introduction of horizontal translation factors to each data set, CRER declined linearly over approximately 13 years (r2=0.80). The growth rate of total GA effective radius was 0.14 mm/year (95% CI 0.12 to 0.15), 3.7-fold higher than the decline rate of CRER (0.038 mm/year, 95% CI 0.034 to 0.042). The decline rate of CRER was 53.3% higher in eyes with than without advanced age-related macular degeneration in the fellow eyes at any visit (p=0.007). CONCLUSIONS: CRER in eyes with GA declined linearly over approximately 13 years and may serve as an anatomic endpoint in future clinical trials aiming to preserve the central zone.

Full Text

Duke Authors

Cited Authors

  • Shen, LL; Sun, M; Ahluwalia, A; Park, MM; Young, BK; Lad, EM; Toth, C; Del Priore, LV

Published Date

  • May 2022

Published In

Volume / Issue

  • 106 / 5

Start / End Page

  • 689 - 695

PubMed ID

  • 33361441

Pubmed Central ID

  • PMC8813644

Electronic International Standard Serial Number (EISSN)

  • 1468-2079

Digital Object Identifier (DOI)

  • 10.1136/bjophthalmol-2020-317636


  • eng

Conference Location

  • England