Comparing Structure-Function Relationships Based on Drasdo's and Sjöstrand's Retinal Ganglion Cell Displacement...

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Imaging

Background:

• Glaucoma is a leading cause of irreversible blindness, characterized by progressive damage to retinal ganglion cells.
• Accurate assessment of structure-function relationships is crucial for early diagnosis and monitoring of glaucoma.
• Retinal ganglion cell displacement models aim to improve the correlation between structural measurements and visual field sensitivity.

Purpose of the Study:

• To compare the efficacy of the Drasdo and Sjöstrand retinal ganglion cell displacement models in evaluating structure-function relationships.
• To investigate how these models perform in eyes with varying axial lengths.

Main Methods:

• A multicenter, cross-sectional study included 305 glaucoma patients and 55 healthy controls.
• Spectral domain optical coherence tomography measured ganglion cell and inner plexiform layer (GCIPL) thickness.
• Visual field sensitivity was assessed using the Humphrey 10-2 test, with A-scan pixels allocated to corresponding visual field locations using both displacement models.

Main Results:

• Both Drasdo and Sjöstrand models significantly improved structure-function relationships around the fovea compared to a no-displacement model (P < 0.05).
• The Drasdo model demonstrated a comparable or greater magnitude of improvement around the fovea than the Sjöstrand model.
• Outside the foveal region, structure-function relationships based on both models were similar to or worse than the no-displacement model.

Conclusions:

• The Drasdo and Sjöstrand models enhance structure-function analysis around the fovea, with the Drasdo model showing particular benefit.
• These models are less effective in improving structure-function relationships in retinal areas outside the fovea.
• The findings highlight the importance of considering displacement models for localized analysis in glaucoma research.