Sector-based analysis of frequency doubling technology sensitivity and optic nerve head shape parameters.

Area of Science:

• Ophthalmology
• Glaucoma Research
• Optic Nerve Head Imaging

Background:

• Glaucoma diagnosis relies on detecting optic nerve damage.
• Frequency Doubling Technology (FDT) and Heidelberg Retina Tomograph (HRT) are key diagnostic tools.
• Understanding the relationship between HRT parameters and FDT sensitivity is crucial for early glaucoma detection.

Purpose of the Study:

• To determine which Heidelberg Retina Tomograph (HRT) parameter best predicts Frequency Doubling Technology (FDT) sensitivity.
• To analyze sector-based correlations between FDT sensitivity and HRT optic nerve head parameters (Cup Shape Measure - CSM, Rim Area - RA).

Main Methods:

• 100 primary open-angle glaucoma patients were studied.
• Data collected included Humphrey Field Analyzer (HFA), FDT, and HRT parameters (RA, CSM).
• Global and sector measurements were analyzed using Pearson's correlation and linear regression.

Main Results:

• Significant correlations were found between FDT indices and HRT RA and CSM (p<0.001).
• Rim Area (RA) emerged as the most predictive HRT parameter for FDT abnormality across most sectors.
• Temporal CSM showed a stronger correlation with FDT fovea sensitivity than temporal RA.

Conclusions:

• Cup Shape Measure (CSM) and Rim Area (RA) are significantly correlated with FDT indices in glaucoma.
• RA is generally more predictive of FDT abnormality than CSM, except in the temporal sector.
• Humphrey Field Analyzer (HFA) demonstrated a stronger predictive relationship with HRT parameters than FDT.