Comparison of Structural, Functional, Tonometric, and Visual Acuity Testing for Glaucoma: A Prospective Diagnostic...

Area of Science:

• Ophthalmology
• Medical Diagnostics
• Glaucoma Research

Background:

• Glaucoma diagnosis relies on various tests, but accuracy for moderate to advanced stages needs further evaluation.
• Early detection is crucial for preventing vision loss in glaucoma patients.
• Screening tests must balance sensitivity and specificity for effective patient management.

Purpose of the Study:

• To assess the diagnostic accuracy of eight potential screening tests for moderate to advanced glaucoma.
• To compare the effectiveness of Optical Coherence Tomography (OCT) and other methods in identifying glaucoma.
• To determine the optimal screening strategy for glaucoma in a South Indian population.

Main Methods:

• A prospective diagnostic test accuracy study was conducted.
• 217 patients aged 50+ presenting to a glaucoma clinic underwent eight index tests.
• Reference standard diagnosis was established by two ophthalmologists using stereoscopic photographs and Humphrey visual fields.

Main Results:

• Optical Coherence Tomography (OCT) demonstrated 84% sensitivity and 75% specificity.
• Moorfield's Motion Displacement Test (MDT) showed 91% sensitivity but only 53% specificity.
• Intraocular pressure and visual acuity tests exhibited low sensitivity for glaucoma detection.

Conclusions:

• OCT is recommended for initial glaucoma assessment due to its balanced sensitivity and specificity.
• MDT can identify cases missed by OCT but has a higher false-positive rate.
• Further research may explore combining OCT and MDT for improved glaucoma screening accuracy.