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A Comparative Analysis of Visual Field Test Results Using Tablet-Based and Table-Mounted Devices in a Telemedicine
Ellen K Antwi-Adjei1,2, Thomas A Swain2,3, Christopher A Girkin2
1School of Optometry, University of Alabama at Birmingham, Birmingham, AL, USA.
Purpose:
To compare visual field (VF) outcomes from tablet-based (Melbourne Rapid Fields [MRF]) and table-mounted (Humphrey Visual Field Analyzer [HFA]) devices in a telemedicine program in underserved rural areas.
Methods:
Participants from the Alabama Screening and Intervention for Glaucoma and eye Health through Telemedicine (AL-SIGHT) study completed VF testing using both HFA and MRF in counterbalanced order. Outcome measures included reliability indices, mean deviation (MD), pattern standard deviation (for HFA/PD for MRF), and VF index (for HFA)/visual capacity (VC for MRF). Analyses were conducted by eye, assessing agreement using intraclass correlation coefficients and Bland-Altman plots.
Results:
Of the 253 eligible participants (mean age, 56.7 ± 12.2 years; 67.6% female; 60.1% White), 174 right eyes and 180 left eyes had reliable results on both devices. Fixation losses were higher with HFA (P < 0.001); however, no significant differences were observed for false positives and false negatives between the devices. For right eyes, agreement between tests was moderate (intraclass correlation coefficient, 0.55 for MD, 0.56 for PD, and 0.65 for VC). No significant differences were observed in MD. The MRF yielded higher PD (mean difference, 0.88 dB; 95% limits of agreement, -5.01 to 3.25 dB) and lower VC (mean difference, 3.01%; 95% limits of agreement, -10.87 to 16.90%). Similar left eyes trends were observed.
Conclusions:
The MRF showed moderate agreement with the HFA across selected VF indices. These findings represent an initial step toward feasibility for telemedicine integration, with additional studies needed to determine reliability and clinical utility.
Translational Relevance:
Tablet-based perimetry shows potential for rural telemedicine settings.
