Abstract
Purpose :
Virtual visual field (VVF) testing has gained popularity and has helped address limitations of standard perimetry, allowing simultaneous tests to be performed at multiple open office locations, without trial lenses, improved comfort. This study examines the correlation of 30-2 locus-locus and mean deviation (MD) between VisuALL (VVF:Olleyes) and Humphrey Visual Field Analyzer (HVF:Zeiss) in glaucomatous eyes in an IRB-approved prospective test-retest study.
Methods :
Robust regression with bisquare weighting was used to estimate the linear correlation coefficient between VVF and HVF for the individual eyes as well as for the combined binocular field. Spearman’s rank correlation was used to determine the relationship between HVF and VVF mean deviation scores.
Results :
47 eyes of 27 glaucoma patients (mean age 69.7yrs) were evaluated. Spearman’s correlation revealed a strong positive correlation between the two MD scores, rs(45) = 0.849, p < .001 (Figure 1). Software analysis was used to generate a correction factor for locus-locus correlation (Figure 2). With corrected analysis, high parity was observed in both the mild and moderate glaucoma groups. The correlation was lower in the severe glaucoma group.
Conclusions :
Results indicate a strong locus-locus correlation between VVF and HVF in patients with mild to moderate glaucoma. The greatest differences between the devices arise at lower sensitivity levels. Such differences may be readily minimized by application of a standardized mathematical adjustment algorithm. Transition to VisuALL in its current form would be expected to facilitate reasonable continuity of clinical documentation, and provide reliable identification of early disease and detection of disease progression.
This abstract was presented at the 2023 ARVO Annual Meeting, held in New Orleans, LA, April 23-27, 2023.