Evaluation of a New Method to Track Changes in Vision at Home for Children Undergoing Amblyopia Treatment.



O'Connor, Anna ORCID: 0000-0002-0376-9670, Waters, Martha ORCID: 0000-0002-9100-2305, England, Laura ORCID: 0000-0001-7097-671X, Milling, Ashli ORCID: 0000-0002-4984-3469 and Kay, Hazel ORCID: 0000-0003-3931-2522
(2021) Evaluation of a New Method to Track Changes in Vision at Home for Children Undergoing Amblyopia Treatment. The British and Irish orthoptic journal, 17 (1). pp. 70-78.

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Abstract

<h4>Purpose</h4>A new amblyopia tracker app has been designed to provide parents with a method of monitoring a child's vision by presenting a single optotype size that the tester moves to identify the furthest distance the optotypes can be seen. The aim of this study is to evaluate this methodology in adults, comparing the findings to visual acuity (VA) measured with the iSight app and to determine the test retest variability.<h4>Methods</h4>Adults, aged 18-39 years, with no known eye condition and VA ≤ 0.7 logMAR were recruited. Bangerter filters were used to simulate amblyopia, where VA was reduced below 0.0 with an interocular difference of at least 0.2 logMAR. Testing for both apps was performed monocularly, with the test order being randomised.<h4>Results</h4>Data from 32 subjects were analysed. For the test retest variability analysis, paired t-tests showed no statistically significant difference between the tests for either eye, either app or the interocular acuity difference (p > 0.3 in all cases). Bland Altman plots showed similar limits of agreement between the two apps. When comparing measurements between the apps there was no statistically significant difference on the first or second test, either eye or the interocular acuity difference (p > 0.5 in all cases).<h4>Conclusion</h4>The results support the theory that changing distance is a valid method of assessing VA as the measurements agree well with the standard approach of reducing optotype size. Test retest variability is similar between the two apps and there is good agreement between the measurements.

Item Type: Article
Uncontrolled Keywords: amblyopia, app, optotype, test retest variability, visual acuity
Divisions: Faculty of Health and Life Sciences
Faculty of Health and Life Sciences > Institute of Population Health
Faculty of Health and Life Sciences > Institute of Population Health > School of Health Sciences
Depositing User: Symplectic Admin
Date Deposited: 13 Apr 2021 07:28
Last Modified: 18 Jan 2023 22:53
DOI: 10.22599/bioj.172
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3119094