Diagnosing preperimetric glaucoma with spectral domain optical coherence tomography

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Diagnostics

Background:

• Glaucoma diagnosis often relies on detecting optic nerve damage.
• Preperimetric glaucoma, characterized by optic nerve changes before visual field loss, presents a diagnostic challenge.
• Early detection of glaucoma is crucial for timely intervention and vision preservation.

Purpose of the Study:

• To assess the diagnostic accuracy of spectral domain optical coherence tomography (SD-OCT) for identifying preperimetric glaucoma.
• To compare the performance of SD-OCT with confocal scanning laser ophthalmoscopy (CSLO) in detecting early glaucomatous damage.

Main Methods:

• A cohort study involving 134 eyes of 88 glaucoma suspects was conducted.
• Retinal nerve fiber layer (RNFL) imaging was performed using Spectralis SD-OCT and Heidelberg Retinal Tomograph III (HRT-III) CSLO.
• Diagnostic accuracy was evaluated using areas under the receiver operating characteristic curves (AUCs) and likelihood ratios (LRs).

Main Results:

• SD-OCT demonstrated superior diagnostic accuracy, with temporal superior RNFL thickness achieving the highest AUC (0.88 ± 0.03).
• CSLO's best parameter, rim area, had a significantly lower AUC (0.72 ± 0.05) compared to SD-OCT's temporal superior RNFL thickness (P=0.008).
• SD-OCT parameters, when outside normal limits, were associated with strongly positive LRs, indicating high diagnostic value.

Conclusions:

• Retinal nerve fiber layer (RNFL) assessment using SD-OCT is effective in detecting preperimetric glaucomatous damage.
• SD-OCT exhibits superior performance compared to CSLO in the diagnosis of early glaucoma in glaucoma suspects.
• SD-OCT offers a valuable tool for the early detection and management of glaucoma.