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As some items could not be completed by all participants, five categories of completion time were created for analysis (quartiles and a fifth category representing non-completion). The \u2018method of successive dichotomisations\u2019\u2014a polytomous Rasch model that always estimates ordered response category thresholds, enabling its application to binned continuous data\u2014was applied to create a single combined measure of performance. Errors were not analysed as they occurred infrequently and generally increased completion time. Eleven participants with age-related macular degeneration were retested after 2\u20134 weeks. Clinical vision measures, including visual acuity, contrast sensitivity and visual fields, were also collected.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Initial analysis of the 17-task ALLVA led to removal of one item, walking a mobility course, due to infit and outfit mean square statistics being outside the acceptable range. For the remaining 16 tasks, item difficulty was well targeted to person ability, with only a minor floor effect. Item and person reliability values were 0.98 and 0.93, respectively. Clinical vision measures were significantly correlated with person measures. Bland\u2013Altman analysis indicated a mean difference between test and retest person measures of \u22120.08 logits (95% limits of agreement 2.16 to \u22122.32 logits).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The ALLVA is the first comprehensive vision-related low luminance performance-based measure. It demonstrated strong Rasch psychometric properties, validity and good test-retest reliability.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s44402-026-00018-2","type":"journal-article","created":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T12:53:36Z","timestamp":1772024016000},"page":"81-89","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Development and Validation of the Assessment of Low Luminance Vision-Related Activities"],"prefix":"10.1007","volume":"46","author":[{"given":"Dinesh","family":"Venugopal","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joanne","family":"Wood","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alex","family":"Black","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chris","family":"Bradley","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sharon","family":"Bentley","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,2,25]]},"reference":[{"key":"18_CR1","doi-asserted-by":"publisher","first-page":"1196","DOI":"10.1016\/s0161-6420(01)00580-2","volume":"108","author":"C Owsley","year":"2001","unstructured":"Owsley C, Jackson GR, White M, Feist R, Edwards D. 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