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Quantitative Autofluorescence in Non-Neovascular Age Related Macular Degeneration
Shruti Chandra1,2, Manjot K Grewal2, Sarega Gurudas1
1Institute of Ophthalmology, University College London, London EC1V 9EL, UK.
Biomedicines
|February 25, 2023
Summary
Quantitative autofluorescence (qAF8) levels decrease in non-neovascular age-related macular degeneration (AMD). This suggests early retinal pigment epithelium dysfunction in AMD patients.
Area of Science:
- Ophthalmology
- Retinal Imaging
- Age-Related Macular Degeneration Research
Background:
- Quantitative autofluorescence (qAF8) is a potential marker for lipofuscin accumulation in the retina.
- Lipofuscin is linked to retinal aging and diseases like age-related macular degeneration (AMD).
Purpose of the Study:
- To investigate changes in qAF8 levels in individuals with non-neovascular AMD.
- To determine if qAF8 can serve as an early indicator of retinal changes in AMD.
Main Methods:
- A prospective cohort study involving 231 participants (353 eyes) aged ≥50 years with non-neovascular AMD.
- Analysis of qAF8 levels in specific retinal segments using HEYEX software.
- AMD grading based on Beckman classification and multimodal imaging (MMI), including subretinal drusenoid deposits (SDD).
Main Results:
- Eyes with AMD showed significantly decreased qAF8 levels compared to age-matched controls (-19.7%).
- qAF8 levels decreased across all stages of non-neovascular AMD (Early, intermediate AMD, geographic atrophy).
- MMI revealed reduced qAF8 in intermediate AMD, SDD, and atrophy subgroups compared to controls.
Conclusions:
- qAF8 levels decline early in the progression of non-neovascular AMD.
- The findings suggest an early and sustained loss of retinal pigment epithelium function in AMD.
- qAF8 may serve as a valuable biomarker for monitoring AMD progression.
