Validation of the Iowa Head-Mounted Open-Source Perimeter

Zachary Heinzman; Edward Linton; Iván Marín-Franch; Andrew Turpin; Karam Alawa; Anushi Wijayagunaratne; Michael Wall

doi:10.1167/tvst.12.9.19

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Validation of the Iowa Head-Mounted Open-Source Perimeter

Journal article

Open access

Peer reviewed

Validation of the Iowa Head-Mounted Open-Source Perimeter

Zachary Heinzman, Edward Linton, Iván Marín-Franch, Andrew Turpin, Karam Alawa, Anushi Wijayagunaratne and Michael Wall

Translational vision science & technology, Vol.12(9), 19

09/25/2023

DOI: 10.1167/tvst.12.9.19

PMCID: PMC10528495

PMID: 37747414

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Abstract

Purpose: To assess the validity of visual field (VF) results from the Iowa Head-Mounted Display (HMD) Open-Source Perimeter and to test the hypothesis that VF defects and test–retest repeatability are similar between the HMD and Octopus 900 perimeters. Methods: We tested 20 healthy and nine glaucoma patients on the HMD and Octopus 900 perimeters using the Open Perimetry Interface platform with size V stimuli, a custom grid spanning the central 26° of the VF, and a ZEST thresholding algorithm. Historical data from the Humphrey Field Analyzer (HFA) were also analyzed. Repeatability was analyzed with the repeatability coefficient (RC), and VF defect detection was determined through side-by-side comparisons. Results: The pointwise RCs were 2.6 dB and 3.4 dB for the HMD and Octopus 900 perimeters in ocular healthy subjects, respectively. Likewise, the RCs were 4.2 dB and 3.5 dB, respectively, in glaucomatous patients. Limits of agreement between the HMD and Octopus 900 perimeters were ±4.6 dB (mean difference, 0.4 dB) for healthy patients and ±8.9 dB (mean difference, 0.1 dB) for glaucomatous patients. Retrospective analysis showed that pointwise RCs on the HFA2 perimeter were between 3.4 and 3.7 dB for healthy patients and between 3.9 and 4.7 dB for glaucoma patients. VF defects were similar between the HMD and Octopus 900 for glaucoma subjects. Conclusions: The Iowa Virtual Reality HMD Open-Source Perimeter is as repeatable as the Octopus 900 perimeter and is a more portable and less expensive alternative than traditional perimeters. Translational Relevance: This study demonstrates the validity of the visual field results from the Iowa HMD Open-Source Perimeter which may help expand perimetry access.

Details

Title: Subtitle: Validation of the Iowa Head-Mounted Open-Source Perimeter
Creators: Zachary Heinzman - University of Iowa
Edward Linton - University of Iowa
Iván Marín-Franch - Tavistock Institute
Andrew Turpin - Curtin University
Karam Alawa - Massachusetts Eye and Ear Infirmary
Anushi Wijayagunaratne - University of Iowa
Michael Wall - University of Iowa
Resource Type: Journal article
Publication Details: Translational vision science & technology, Vol.12(9), 19
DOI: 10.1167/tvst.12.9.19
PMID: 37747414
PMCID: PMC10528495
NLM abbreviation: Transl Vis Sci Technol
ISSN: 2164-2591
eISSN: 2164-2591
Language: English
Date published: 09/25/2023
Academic Unit: Neurology; Biology; Ophthalmology and Visual Sciences
Record Identifier: 9984469233702771

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