Comparison of Event-based Analysis Versus Trend-based Analysis in the Detection of Glaucoma Progression by Optical...

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Research

Background:

• Glaucoma is a progressive optic neuropathy characterized by structural damage.
• Accurate detection of glaucoma progression is crucial for timely intervention.
• Spectral domain optical coherence tomography (OCT) provides detailed structural measurements.

Purpose of the Study:

• To compare event-based versus trend-based analysis for detecting glaucoma progression.
• To evaluate the efficacy of OCT Retinal Nerve Fiber Layer (RNFL) thickness and Minimum Distance Band (MDB) neuroretinal rim measurements.
• To determine the optimal analytical method for identifying structural changes in glaucoma patients.

Main Methods:

• A 5-year longitudinal study involving 124 open-angle glaucoma patients.
• Yearly assessments included dilated eye exams, disc photography, and OCT measurements (RNFL and MDB).
• Event-based analysis defined progression as change exceeding normal aging and variability; trend-based analysis used linear regression for decline rates.

Main Results:

• Event-based analysis detected progression in significantly more patients compared to trend-based analysis (MDB: 52.4% vs. 9.7%; RNFL: 15.3% vs. 8.1%).
• Progression was detected earlier with event-based analysis (MDB: mean 30.7 months vs. 56.2 months; RNFL: mean 28.8 months vs. 63.2 months).
• Minimum Distance Band (MDB) rim thickness showed higher detection rates for progression than Retinal Nerve Fiber Layer (RNFL) thickness using event-based analysis (52.4% vs. 15.3%).

Conclusions:

• Event-based analysis is superior to trend-based analysis for detecting OCT structural progression in glaucoma.
• This method identifies progression in a greater number of patients and at earlier stages.
• MDB rim thickness is a more sensitive indicator of glaucoma progression than RNFL thickness when using event-based analysis.