The authors present a prospective pilot study which aimed to assess the feasibility and performance of the vivid vision perimeter (VVP). The VVP is a piece of software which can be used with off-the-shelf virtual reality (VR) headsets. Recruitment took place at a single ophthalmology centre with children aged 7–18 years old, attending for routine perimetry using the Humphrey visual field analyser (HFA) as part of their routine care, able to follow instructions and a visual acuity of 6/24 or better in at least one eye. Eyes with a refractive error greater than +/-6 dioptre sphere and non-fixing strabismic eyes were excluded. The order of testing was fixed with HFA (threshold) first followed by the VVP (suprathreshold), both using 24-2 strategies. Following testing each participant was surveyed to assess their satisfaction and preference related to the two perimetry assessments. A total of 23 participants (37 eyes) completed both perimetry assessments, exceeding the required sample calculation. Reliability was similar across both perimetry assessments ranging from 54–65% dependent on the criteria applied. Moderate correlation was found between the HFA and VVP results, when unreliable HFA results were excluded. All participants expressed a preference for the VVP. It was concluded that VVP is feasible and acceptable amongst children. Limitations of the study are acknowledged including the small sample size, inappropriateness of comparison between threshold and suprathreshold tests, lack of agreed reliability metrics for the VVP and potential order of testing bias. Further assessment of VR perimetry is required based on the feasibility and acceptability reported in this study.
Feasibility and acceptability of virtual reality visual field testing compared to standard perimetry
Reviewed by Lauren Hepworth
Pilot study comparing a new virtual-reality-based visual field test to standard perimetry in children.
CONTRIBUTOR
Lauren R Hepworth
University of Liverpool; Honorary Stroke Specialist Clinical Orthoptist, Northern Care Alliance NHS Foundation Trust; St Helen’s and Knowsley NHS Foundation Trust, UK.
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