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Characterizing visual fields in RPGR related retinitis pigmentosa using Octopus static-automated perimetry

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posted on 2023-07-26, 15:49 authored by Thomas M. Buckley, Amandeep S. Josan, Laura J. Taylor, Jasleen K. Jolly, Jasmina Cehajic-Kapetanovic, Robert E. MacLaren
Purpose: Peripheral visual fields have not been as well defined by static automated perimetry as kinetic perimetry in RPGR-related retinitis pigmentosa. This study explores the pattern and sensitivities of peripheral visual fields, which may provide an important end point when assessing interventional clinical trials. Methods: A retrospective observational cross-sectional study of 10 genetically confirmed RPGR subjects was performed. Visual fields were obtained using the Octopus 900 perimeter. Interocular symmetry and repeatability were quantified. Visual fields were subdivided into central and peripheral subfields for analysis. Results: Mean patient age was 32 years old (20 to 49 years old). Average mean sensitivity was 7 dB (SD = 3.67 dB) and 6.8 dB (SD = 3.4 dB) for the right and left eyes, respectively, demonstrating interocular symmetry. Coefficient of repeatability for overall mean sensitivity: <2 dB. Nine out of 10 subjects had a preserved inferotemporal subfield, whose mean sensitivity was highly correlated to the central field (r2 = 0.78, P = 0.002 and r2 = 0.72, P = 0.002 for the right and left eyes, respectively). Within the central field, sensitivities were greater in the temporal than the nasal half (t-test, P = 0.01 and P = 0.03 for the right and left eyes, respectively). Conclusions: Octopus static-automated perimeter demonstrates good repeatability. Interocular symmetry permits use of the noninterventional eye as an internal control. In this cohort, the inferotemporal and central visual fields are preserved into later disease stages likely mapping to populations of surviving cones. Translational Relevance: A consistently preserved inferotemporal island of vision highly correlated to that of the central visual field may have significance as a possible future therapeutic site.

History

Refereed

  • Yes

Volume

11

Issue number

5

Page range

15

Publication title

Translational Vision Science and Technology

ISSN

2164-2591

Publisher

ARVO

File version

  • Published version

Language

  • eng

Legacy posted date

2022-05-10

Legacy creation date

2022-05-17

Legacy Faculty/School/Department

Faculty of Health, Education, Medicine & Social Care

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