Prediction of Central Visual Field Severity in Glaucoma

Area of Science:

• Ophthalmology
• Visual Neuroscience
• Medical Diagnostics

Background:

• Central visual field defects (CVFDs) are a hallmark of glaucoma.
• Early detection and prediction of glaucoma progression are crucial for timely intervention.
• Standard visual field (VF) testing (24-2 VF) may not fully capture early central vision loss.

Purpose of the Study:

• To investigate the association between specific perimetric parameters on the 24-2 VF and the severity of central visual field defects.
• To determine if early glaucoma-related visual field damage can be predicted using data from specific points on the 24-2 VF test.
• To correlate findings on the 24-2 VF with parafoveal scotomas detected on the 10-2 VF.

Main Methods:

• Retrospective analysis of 64 eyes from 56 glaucoma patients with CVFDs on 24-2 VF (mean deviation > -7 dB).
• Patients underwent both 24-2 and 10-2 VF testing within a 6-month period.
• Analysis focused on perimetric parameters at abnormal points (P<1%) within the central 12 points (4 central + 8 paracentral) on 24-2 VF deviation plots to predict CVFD severity.

Main Results:

• Eyes with arcuate scotomas on 10-2 VF exhibited significantly greater functional vision loss.
• Abnormalities in threshold sensitivity (<20 dB) and defect values (>-15 dB) at specific abnormal points on the 24-2 VF were strongly associated with arcuate scotomas on the 10-2 VF.
• A superior nasal defect within the central 5 degrees on the 24-2 VF was a significant predictor of arcuate defects on the 10-2 VF.

Conclusions:

• Clinicians can predict the severity of central visual field defects and parafoveal scotomas in early glaucoma.
• Measuring threshold sensitivities and defect values at specific abnormal points on the 24-2 VF is a valuable predictive method.
• This approach aids in assessing the extent of visual impairment and potential progression in early-stage glaucoma.