Quantitative assessment of diffuse retinal nerve fiber layer atrophy using optical coherence tomography: diffuse...

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Diseases

Background:

• Diffuse retinal nerve fiber layer (RNFL) atrophy is a key indicator of various ocular conditions.
• Accurate quantitative assessment of RNFL atrophy is crucial for diagnosis and monitoring.
• Stratus optical coherence tomography (OCT) is a widely used imaging modality.

Purpose of the Study:

• To quantitatively evaluate the degree of diffuse RNFL atrophy using Stratus OCT.
• To assess the correlation between OCT-measured RNFL thickness and the severity of diffuse RNFL atrophy.
• To determine the diagnostic performance of OCT parameters in identifying RNFL atrophy.

Main Methods:

• Prospective, cross-sectional study involving 102 patients with diffuse RNFL atrophy and 102 healthy controls.
• RNFL photographs were graded by two experienced observers using a standardized 4-level system.
• Stratus OCT was used to measure average and segmental RNFL thicknesses.
• Area under the receiver operating characteristic curves (AROCs) were calculated for OCT parameters.

Main Results:

• High inter-observer agreement was achieved for RNFL atrophy grading (kappa values > 0.76).
• Significant differences in RNFL thickness were found between normal and atrophic eyes, particularly in the 7 and 11 o'clock sectors.
• OCT RNFL thickness decreased with increasing atrophy severity, with high AROCs for discriminating mild atrophy.

Conclusions:

• Stratus OCT parameters demonstrate excellent quantitative correlation with the degree of diffuse RNFL atrophy.
• OCT measurements provide objective and accurate assessment of RNFL damage.
• Stratus OCT is a valuable tool for adjunctively assessing diffuse RNFL atrophy.