Detection of optic disc changes with Glaucoma-Scope probability maps

Area of Science:

• Ophthalmology
• Medical Imaging
• Statistical Analysis

Background:

• Optic disc topography changes are crucial indicators of glaucoma progression.
• Accurate detection of these changes is vital for timely intervention.
• Current methods for assessing optic disc topography may have limitations in sensitivity.

Purpose of the Study:

• To evaluate a statistical method utilizing probability maps for detecting true changes in optic disc topography.
• To compare the efficacy of this probability map method against the change in mean position of the disc (MPD).

Main Methods:

• Utilized Glaucoma-Scope images to construct probability maps for each eye.
• Calculated the proportion of topographic locations with p-values < 0.05 (p-proportion) and the change in MPD between two sessions.
• Determined cutoff values for 95% specificity using a control group with no expected change.
• Assessed sensitivity for detecting clinical change in 43 eyes with longitudinal follow-up.

Main Results:

• The p-proportion method achieved 100% sensitivity, while MPD change had 85.7% sensitivity in detecting clinical changes.
• Cutoff values for 95% specificity were 18% for p-proportion and 25.1 microns for MPD change.
• Percent change in intraocular pressure (IOP) strongly correlated with both p-proportion and MPD change.

Conclusions:

• A statistical probability mapping method, using Glaucoma-Scope data, can reliably detect true optic disc topography changes.
• The p-proportion metric demonstrated superior sensitivity compared to MPD change for identifying clinical progression.
• This statistical methodology holds potential for application with other optic disc analysis systems.