Correlation between retinal function and microstructural foveal changes in intermediate age related macular...

Area of Science:

• Ophthalmology
• Retinal Imaging
• Age-Related Macular Degeneration Research

Background:

• Intermediate age-related macular degeneration (AMD) is characterized by drusen and pigmentary changes.
• Foveal microstructural integrity is crucial for visual function, but its relationship with specific biomarkers in AMD is still being elucidated.

Purpose of the Study:

• To investigate the association between foveal microstructural changes and functional outcomes like retinal sensitivity (RS) and fixation stability in intermediate AMD.
• To identify specific morphological predictors of visual function using microperimetry.

Main Methods:

• A cross-sectional study involving 22 patients with intermediate AMD.
• Retinal sensitivity and bivariate contour ellipse area (BCEA) were measured using microperimeter MP-1.
• Foveal microstructures including external limiting membrane (ELM), inner ellipsoid zone (ISel), and hyperreflective foci (HF) were analyzed and correlated with functional measures.

Main Results:

• Retinal sensitivity (RS) was inversely correlated with the presence of hyperreflective foci (HF) and disruptions in the external limiting membrane (ELM) and ellipsoid zone (ISel).
• Fixation stability, measured by BCEA, was positively related to ellipsoid zone integrity.
• Logistic regression identified ISel disruption as a predictor of fixation instability, while HF and ELM disruption predicted reduced RS.

Conclusions:

• External limiting membrane (ELM) integrity and the presence of hyperreflective foci (HF) are significant predictors of reduced retinal sensitivity in intermediate AMD.
• ELM integrity may serve as a novel biomarker for retinal function alongside HF.
• Inner ellipsoid zone (ISel) integrity appears to be a more specific predictor of fixation stability than retinal sensitivity.