Multicenter Comparison of the Toronto Portable Perimeter with the Humphrey Field Analyzer: A Pilot Study

Area of Science:

• Ophthalmology
• Medical Devices
• Diagnostic Technology

Background:

• Glaucoma visual field (VF) testing is crucial for diagnosis and management.
• The Humphrey Field Analyzer (HFA) is a standard but less portable device.
• The Toronto Portable Perimeter (TPP) offers a potentially more accessible alternative.

Purpose of the Study:

• To evaluate the diagnostic agreement between the TPP and HFA for glaucoma 24-2 visual field testing.
• To compare key visual field parameters and test durations between the two devices.
• To assess patient preference for the TPP versus the HFA.

Main Methods:

• A multicenter prospective cohort study included patients with suspected or confirmed glaucoma.
• Consecutive 24-2 VF tests were performed on the same eye using both HFA and TPP in a randomized order.
• Bland-Altman analysis, paired t tests, and a validated questionnaire were used for comparison and preference assessment.

Main Results:

• One hundred fifty eyes from 91 patients were analyzed, showing good agreement between HFA and TPP for mean deviation (MD), pattern standard deviation (PSD), and visual field index (VFI).
• No statistically significant differences were found in MD, PSD, VFI, or test duration between the two devices.
• Patients significantly preferred the TPP over the HFA for the testing experience.

Conclusions:

• The TPP demonstrates statistically similar outcomes to the HFA for key glaucoma VF parameters.
• Test durations were comparable, and patient experience was significantly better with the TPP.
• The TPP presents a promising, accessible alternative for glaucoma visual field testing.