Purchase this article with an account.
Aazim A. Siddiqui, Matthew S. Wieder, Aaron Smith, Carl Block, Swathi C. Reddy, Mark Harooni, Erin Lewis, Ricardo Tochimani, Irene Rusu, Joyce N. Mbekeani; Quantitative mapping of visual function using a novel virtual reality headset device. Invest. Ophthalmol. Vis. Sci. 2020;61(9):PB004.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
Virtual visual field (VVF) devices can be programmed to map visual function based on principles similar to conventional visual field (VF) machines. The headsets present light of varying size and luminance in space and registers visual perception, providing a map of sensitivities in greyscale and decibels (dB) for both global and pattern deviations. The VVF is also capable of binocular testing which improves acquisition speed while its wireless connectivity allows for remote imaging. We analyzed the accuracy of VF images generated by a new VVF device in patients with various stages of glaucoma.
A retrospective study of 20 glaucoma patients was conducted. The diagnoses, demographic details, times taken to perform the VVF and mean deviations were recorded. The percent correlation between optic nerve appearances and 24-2 VVF was determined for all eyes and confirmed by a glaucoma specialist. Patients documented as normal were also evaluated and used as controls. Analysis was completed using student T-test. Patients with incomplete data sets were excluded.
Twenty-seven eyes of 14 patients had both fundus photos and VVF that fulfilled our criteria for evaluation. Diagnoses ranged from glaucoma suspect to end-stage glaucoma. Twenty-two VVFs (81.5%) corresponded with optic nerve appearances, while 5 (18.5%) did not. Eighty-three eyes from 42 patients with normal retina and optic nerve exams were used as controls; 91.3% had full VVFs. The mean (SD) testing time in the glaucoma group was 5:20 (1:20) minutes and in the control group, 5:04 (1:00) minutes (p=0.2857). Mean deviation (SD) was -3.867 (7.486) dB in the glaucoma group and 0.587 (2.588) dB in the control group (p<0.0001).
The VVF device effectively produced VF defects that corresponded with optic nerve findings and achieved this with similarly short testing times as controls. The low cost and small size afford portability and potential for bedside use while its wireless capability would allow for remote imaging and analysis. VVF could play a major role in telemedicine. Further studies will aim to compare mean sensitivities and global indices of VVF with the gold standard, Humphrey VF, and correlate VVF findings in glaucoma with optical coherence tomography of the retinal nerve fiber layer.
This is a 2020 Imaging in the Eye Conference abstract.
This PDF is available to Subscribers Only