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Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration
Published on: May 26, 2023
Localized interdigitation zone thinning in age-related macular degeneration
Jost B Jonas1,2,3,4,5,6,7, Songhomitra Panda-Jonas1,4,7,8, Jie Xu9
1Rothschild Foundation Hospital, Institut Français de Myopie, Paris, France.
Scientific Reports
|June 25, 2026
Summary
Localized thinnings of the interdigitation zone (IZT) are common in age-related macular degeneration (AMD), even in early stages. These findings correlate with AMD progression and specific retinal defects, suggesting potential insights into AMD etiology.
Area of Science:
- Ophthalmology
- Retinal Imaging
- Macular Degeneration Research
Background:
- Localized thinnings of the interdigitation zone (IZT) are optical coherence tomography findings.
- Their association with age-related macular degeneration (AMD) and specific retinal pathologies requires elucidation.
Purpose of the Study:
- To determine the prevalence and associations of localized thinnings of the interdigitation zone (IZT) in a general population.
- To investigate the relationship between IZT and various stages of age-related macular degeneration (AMD) and associated retinal defects.
Main Methods:
- Analysis of optical coherence tomographic images from the Beijing Eye Study, including 1271 eyes.
- Identification and quantification of IZTs, and assessment of their spatial and non-spatial associations with retinal features like ellipsoid zone (EZ) defects, external limiting membrane (ELM) defects, intraretinal hyperreflective foci (iHRF), macular hypopigmentation, and RPE hypertransmission.
- Multivariable analysis to correlate IZT prevalence with AMD stage and other retinal abnormalities.
Main Results:
- IZT prevalence increased significantly with AMD stage, from 0.5% in normal eyes to 81.8% in eyes with geographic atrophy.
- IZTs were spatially associated with EZ defects (76.0%), ELM defects (61.3%), iHRFs (95.2%), macular hypopigmentation (50.7%), and RPE hypertransmission (30.7%).
- Higher IZT prevalence correlated with higher AMD stage, EZ defects, iHRFs in the outer nuclear layer, RPE hypertransmissions, and outer nuclear layer thinning.
Conclusions:
- Localized thinnings of the interdigitation zone (IZT) are a frequent finding in age-related macular degeneration (AMD), present even in early stages.
- The observed associations suggest a potential role for intraretinal retinal pigment epithelium (RPE) cell migration in the etiology of IZTs.
- Further research into IZT's potential involvement in AMD pathogenesis is warranted.
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