Center Focus Visual Field Test Accurately Measures Change in Glaucoma Defects

04 November 2021

2 minutes to read

Source / Disclosures

Source:

Phu J, Kalloniatis M. Le 10-2 provides more information to track visual field progression in central visual field defects compared to 24-2. Presented at the American Academy of Optometry Annual Meeting; 2-6 Nov 2021; Boston.

Disclosures: Phu reports that the study was funded in part by grants from the National Health and Medical Research Council and that Guide Dogs NSW / ACT provides salary support for himself and his colleague, Kalloniatis.


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BOSTON – The 10-2 visual field test provided a greater dynamic range for measuring the potential change in visual field defects in glaucoma compared to the 24-2 test, according to a study presented at the annual meeting of the American Academy of Optometry.

“When we consider the current way we measure the visual field in eye diseases like glaucoma, it is mainly related to the overview of your vision, including peripheral vision” Jack Phu, Boptom (Hons), BSc, MPH, PhD, FAAO, from the University of New South Wales, said at a press conference sponsored by the Virtual Academy. “Our research question was when would it be useful to start assessing the central 10 degrees of the visual field, because we can agree that this is also very important.”

Phu and his colleague from the University of New South Wales, Michael Kalloniatis, PhD, performed the current standard clinical test 24-2, a test focused on 10 degrees of the visual field, and chose vertical and horizontal meridians that approximately overlapped between the two test grids.

They then calculated the number of discrete significant steps in 3 dB increments up to the visual field measurement floor of –22 dB.

Phu and Kalloniatis examined the 10-2 and 24-2 test results of 73 patients with central visual field abnormalities.

The magnitude of the deepest defect on all meridians as well as the defect difference were similar between the grids. Phu said this meant the 24-2 had a “flatter gradient” of dB per degree, as it has 6 degree dot spacing, compared to the 2 degree dot spacing of the 10-2 test. (Beach of P = .02 to P <.0001>

“What this flat gradient implies is that information is missing between the test locations that are evaluated on the 24-2 due to the resolution of the test because it is not so focused on the visual field. central.

Phu and Kalloniatis also found that there were proportionately fewer cases where the measurement floor was reached (P <.0001 and a greater number of remaining steps>P = .01) with test 10-2 compared to test 24-2.

“We concluded that the 10-2 test with 10 degree focus offers more opportunities to characterize and monitor central visual field defects compared to the clinical standard, so we recommend it for use even in the early stages. glaucoma, ”said Phu.

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