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Data was collected from myopic children who received photobiomodulation therapy for 6\u2009\u223c\u200912 months. Effectiveness of myopia control was defined as any follow-up axial length\u2009\u2264\u2009baseline axial length, confirming a reduction in axial length. Independent t-test was used to compare the effectiveness of the younger group and the older group with SPSS 22.0.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>342 myopic children were included with mean age 8.64\u2009\u00b1\u20092.20 years and baseline mean axial length of 24.41\u2009\u00b1\u20091.17\u00a0mm. There were 85.40%, 46.30%, 71.20% and 58.30% children with axial length shortening recorded at follow-up for 1 month, 3 months, 6 months and 12 months, respectively. With respect to the axial length shortened eyes, the mean axial length difference (standard deviation) was \u2212\u20090.039 (0.11) mm, -0.032 (0.11) mm, -0.037 (0.12) mm, -0.028 (0.57) mm at 1, 3, 6, and 12-month follow-up, respectively. Greater AL shortening was observed among the older group who had longer baseline axial lengths than the younger group (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Overall myopia control effectiveness using photobiomodulation therapy was shown to be age and time related, with the maximum absolute reduction in axial elongation being cumulative.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12886-024-03427-4","type":"journal-article","created":{"date-parts":[[2024,4,25]],"date-time":"2024-04-25T10:02:19Z","timestamp":1714039339000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["A retrospective study of cumulative absolute reduction in axial length after photobiomodulation therapy"],"prefix":"10.1186","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5195-7564","authenticated-orcid":false,"given":"Kaikai","family":"Qiu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8544-0897","authenticated-orcid":false,"given":"Coveney","family":"David","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2895-6819","authenticated-orcid":false,"given":"Zhou","family":"Lei","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3147-5629","authenticated-orcid":false,"given":"Liyang","family":"Tong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wen","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,4,25]]},"reference":[{"issue":"11","key":"3427_CR1","doi-asserted-by":"publisher","first-page":"1709","DOI":"10.1136\/bjo-2021-321005","volume":"107","author":"J Rappon","year":"2023","unstructured":"Rappon J, Chung C, Young G, Hunt C, Neitz J, Neitz M, Chalberg T. 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