Glaucoma probability score vs Moorfields classification in normal, ocular hypertensive, and glaucomatous eyes

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Diagnostics

Background:

• Glaucoma is a leading cause of irreversible blindness.
• Accurate differentiation between normal and glaucomatous eyes is crucial for timely intervention.
• The Heidelberg Retina Tomograph III (HRT III) glaucoma probability score (GPS) is a newer diagnostic tool.

Purpose of the Study:

• To assess the HRT III GPS's ability to distinguish between normal and pathological eyes.
• To compare the diagnostic performance of the GPS against Moorfields regression analysis (MRA).

Main Methods:

• A prospective cross-sectional study involving 59 normal, 40 hypertensive, and 83 glaucomatous eyes.
• Swedish interactive threshold algorithm standard 24-2 visual fields and HRT III imaging were utilized.
• Sensitivity, specificity, and agreement (kappa coefficient) were evaluated for GPS and MRA against visual field damage.

Main Results:

• GPS demonstrated higher sensitivity (71.1%-85.5%) but lower specificity (69.5%-54.2%) compared to MRA (39.8%-68.7% sensitivity, 93.2%-83.1% specificity).
• Visual field parameters correlated significantly with both global and sectorial GPS.
• The agreement between GPS and MRA was low (kappa coefficient = 0.34).

Conclusions:

• The HRT III GPS is more sensitive but less specific than MRA in glaucoma detection.
• GPS did not effectively differentiate between normal and hypertensive eyes.
• Despite low agreement, GPS offers advantages over MRA in identifying early-stage glaucoma.