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Related Experiment Video

Updated: Aug 25, 2025

Author Spotlight: Understanding Age-Related Macular Degeneration Pathophysiology with QAF Workflow
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Atrophy Expansion Rates in Stargardt Disease Using Ultra-Widefield Fundus Autofluorescence.

Rachael C Heath Jeffery1,2, Jennifer A Thompson3, Johnny Lo4

  • 1Centre for Ophthalmology and Visual Science (incorporating Lions Eye Institute), The University of Western Australia, Perth, Australia.

Ophthalmology Science
|October 17, 2022
PubMed
Summary

Ultra-widefield fundus autofluorescence (UWF FAF) reliably measures atrophy expansion rate in Stargardt disease (STGD1). ABCA4 mutation severity influences this rate, suggesting potential for personalized STGD1 treatments.

Keywords:
ABCA4-associated retinopathyClinical trial end pointDDAF, definitely decreased autofluorescenceER, expansion rateETDRS, Early Treatment Diabetic Retinopathy StudyFAF, fundus autofluorescenceInherited retinal diseaseMacular dystrophyNIR AF, near-infrared autofluorescenceRetinal dystrophyRetinal imagingSD, standard deviationSRA, square root areaSTGD1, Stargardt diseaseSW AF, short-wavelength autofluorescenceUWF, ultra-widefieldVA, visual acuity

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Area of Science:

  • Ophthalmology
  • Genetics
  • Medical Imaging

Background:

  • Stargardt disease (STGD1) is an inherited retinal dystrophy characterized by progressive macular atrophy.
  • Accurate assessment of atrophy expansion rate (ER) is crucial for understanding STGD1 progression and evaluating therapeutic interventions.
  • Ultra-widefield (UWF) fundus autofluorescence (FAF) offers a broader view of the retina compared to traditional imaging methods.

Purpose of the Study:

  • To investigate the utility of UWF FAF in quantifying atrophy expansion rate (ER) in patients with STGD1.
  • To explore the relationship between ABCA4 genotype and atrophy progression in STGD1.
  • To establish the reliability of UWF FAF for monitoring STGD1.

Main Methods:

  • A retrospective longitudinal study involving 69 patients with biallelic ABCA4 mutations and STGD1.
  • Evaluation using UWF FAF and conventional Heidelberg 30°x30° and 55°x55° FAF imaging.
  • Manual outlining of definitely decreased autofluorescence (DDAF) areas at baseline and follow-up, with subsequent calculation of ER using linear mixed modeling.

Main Results:

  • UWF FAF measurements demonstrated equivalence to conventional FAF imaging.
  • Baseline DDAF area was the sole significant predictor of DDAF area ER (P < 0.001).
  • Age at baseline and ABCA4 genotype group predicted DDAF SRA ER, with ER ranging from 4.65 mm²/year (Group A) to 0.62 mm²/year (Group C).

Conclusions:

  • UWF FAF is a feasible and reliable tool for assessing atrophy ER in STGD1.
  • The predictive value of ABCA4 mutation severity on atrophy ER requires further investigation.
  • This imaging modality can aid in monitoring disease progression and potentially in clinical trial design for STGD1.