Background: Restrictions due to the recent COVID-19 pandemic catalysed the deployment of telehealth solutions . A novel web-based visual acuity test, validated in a healthy population, may be of great value in the follow-up of uveitis patients . Objective To determine the measurement accuracy of the unsupervised remote Easee web-based visual acuity test in uveitis patients, when compared to a conventional in-hospital assessment .
Methods: Cross-sectional diagnostic accuracy study . Between April 2020 and September 2020, consecutive adult uveitis patients were invited for the web-based visual acuity test (index test) within two weeks prior to their conventional in-hospital assessment (reference test).
Results: A total of 269 patients were invited by mail, of whom 84 visited the website (31 %). Ultimately 98 eyes met the criteria for statistical analysis . The mean difference between the two tests was low and non-significant : 0.02 logMAR (SD 0.12, P = 0.085). The 95% limits of agreement ranged from -0.21 to 0.26 logMAR . No relevant differences were identified in clinical characteristics between subgroups with a good performance (i.e . difference between the tests <=0.15 logMAR) or underperformance (i.e . difference> 0.15 logMAR) on the web-based test . Conclusion: The web-based visual acuity test is a promising tool to remotely assess visual acuity in the majority of uveitis patients, especially relevant when access to ophthalmic care is limited . No association between patient- or uveitis-related variables and (under) performance of the test were identified . These outcomes underline the potential of remote vision testing in other common ophthalmic conditions . A proper implementation of this web-based tool in health care could be of great value for revolutionizing teleconsultations.