Predictive Factors for Visual Field Conversion: Comparison of Scanning Laser Polarimetry and Optical Coherence...

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Research

Background:

• Glaucoma diagnosis and monitoring are crucial for preventing vision loss.
• Early detection of glaucoma progression is essential for timely intervention.
• Ocular hypertension and early glaucoma require accurate predictive tools.

Purpose of the Study:

• To compare the predictive capabilities of scanning laser polarimetry (SLP) and spectral-domain optical coherence tomography (SD-OCT) for visual field conversion.
• To evaluate the performance of RNFL thickness measurements from both devices in identifying patients at risk.
• To assess the diagnostic accuracy of SLP and SD-OCT parameters in predicting glaucoma progression.

Main Methods:

• Retrospective analysis of 207 patients (ocular hypertension, early glaucoma, controls) from the Erlangen glaucoma registry.
• Peripapillary retinal nerve fiber layer (RNFL) thickness measured by SLP (GDx-VCC) and SD-OCT (Spectralis OCT).
• Calculation of positive and negative predictive values (PPV, NPV), Kaplan-Meier survival analysis, and comparison using statistical tests.

Main Results:

• Both SLP and SD-OCT demonstrated significant ability to predict visual field conversion (P<0.001).
• Highest PPV achieved by SLP temporal-inferior RNFL and SD-OCT temporal-inferior RNFL.
• Highest NPV achieved by SLP nerve fiber indicator and SD-OCT mean RNFL thickness.
• No significant difference in PPV or NPV between SLP and SD-OCT.

Conclusions:

• SLP (GDx-VCC) and SD-OCT provide comparable results in predicting future visual field conversion.
• The nerve fiber indicator from GDx-VCC may be particularly useful for predicting non-conversion.
• Both imaging modalities are valuable tools for glaucoma management and risk assessment.