A handheld radial shape discrimination hyperacuity test: Assessment of variability in a clinical population.



Pitrelli Vazquez, Noelia and Knox, Paul ORCID: 0000-0002-2578-7335
(2014) A handheld radial shape discrimination hyperacuity test: Assessment of variability in a clinical population.

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Abstract

Purpose: A novel handheld Radial Shape Discrimination test (hRSD), presented on an Apple iPod Touch, has been reported to differentiate between early and neovascular Age Related Macular Degeneration (nAMD; Wang et al., 2013). We have investigated the use of this test in a UK clinical setting. Methods: Fifty-five participants (aged 78±7 years old) being treated for nAMD in their first eye, performed a supervised hRSD test with their fellow (non-nAMD) eye at two sessions, 45±17 days apart. 32 participants also performed the test with no near Addition. Test-retest differences, and the effect of performing the test without near Addition, were assessed using paired t-tests, Bland-Altman analysis and Intraclass Correlation Coefficients (ICC). Results: Mean (±SD) hRSD thresholds were not statistically significantly different for the first and second sessions (S1: -0.55±0.17; S2: -0.56±0.18logMAR; t(54)=0.72, p>0.05). The upper and lower Bland-Altman 95% limits of agreement were 0.25 and -0.27 logMAR and the ICC (95%CI) was 0.71 (0.55 to 0.82). A small but statistically significant decrease in threshold was seen when near addition was not used (t(31)=2.99, p

Item Type: Article
Uncontrolled Keywords: AMD. macula, shape discrimination, smartphone, screening, vision, ageing
Depositing User: Symplectic Admin
Date Deposited: 17 Aug 2015 10:01
Last Modified: 28 Nov 2019 08:19
URI: http://livrepository.liverpool.ac.uk/id/eprint/2020599
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