{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T05:18:22Z","timestamp":1788239902965,"version":"build-2803163510"},"reference-count":7,"publisher":"Springer Science and Business Media LLC","license":[{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["25K13607"],"award-info":[{"award-number":["25K13607"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["23H00448"],"award-info":[{"award-number":["23H00448"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003478","name":"Ministry of Health, Labour and Welfare","doi-asserted-by":"publisher","award":["25IA1002"],"award-info":[{"award-number":["25IA1002"]}],"id":[{"id":"10.13039\/501100003478","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Jpn J Ophthalmol"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>Cataract surgery is among the most commonly performed types of surgery in Japan, but the actual surgical volume at the healthcare facility level remains unclear. This is partly because a substantial number of cataract surgical procedures are performed in clinics, making comprehensive investigation of relevant data difficult. This study used the National Database of Health Insurance Claims (NDB) to elucidate the number of surgical procedures, including outpatient procedures, performed at the facility level.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Study design<\/jats:title>\n                    <jats:p>Retrospective observational study.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Using NDB data, we determined the number of cataract surgical procedures performed at the facility level over a 9-year period (fiscal years 2016\u20132024). We also analyzed the proportion of procedures performed in outpatient settings.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Approximately 4,500 facilities performed cataract surgery each year, with the number of facilities increasing. Although variations were observed across prefectures, no systematic regional patterns emerged. In most regions, facilities typically performed 100\u2013300 procedures per year. Many facilities operate entirely at outpatient settings, while others operate entirely at inpatient settings. Facility-level outpatient practice patterns varied substantially across procedure-volume categories. This descriptive pattern was observed across the 9-year period.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>These nationwide facility-level data provide an important baseline for understanding cataract surgery practice in Japan. These findings may support future research and health policy discussions on cataract surgery practice across healthcare facilities.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s10384-026-01416-2","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T04:49:58Z","timestamp":1788238198000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Nationwide patterns of cataract surgery in Japan: facility-level volume and outpatient versus inpatient procedures using the National Database of Health Insurance Claims (NDB)"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3657-8686","authenticated-orcid":false,"given":"Susumu","family":"Kunisawa","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuichi","family":"Imanaka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,1]]},"reference":[{"key":"1416_CR1","unstructured":"Ministry of Health L and W. (2023) Japan basic policy for the fourth phase of medical cost optimization (Dai-yon-ki Iryohi Tekiseika Kihon Hoshin). https:\/\/www.mhlw.go.jp\/content\/12401000\/001114696.pdf. Accessed 10 Apr 2026. (in Japanese)"},{"key":"1416_CR2","unstructured":"Ministry of Health L and W. NDB open data. https:\/\/www.mhlw.go.jp\/stf\/seisakunitsuite\/bunya\/0000177182.html. Accessed 10 Apr 2026. (in Japanese)"},{"key":"1416_CR3","doi-asserted-by":"publisher","first-page":"86","DOI":"10.1016\/j.anl.2025.12.012","volume":"53","author":"S Kunisawa","year":"2026","unstructured":"Kunisawa S, Tateya I, Kato H, Omori K, Fushimi K, Imanaka Y. Cost and clinical outcomes of transoral robotic surgery versus radiation therapy for T1-2N0-1M0 pharyngeal and laryngeal cancers. Auris Nasus Larynx. 2026;53:86\u201390.","journal-title":"Auris Nasus Larynx"},{"key":"1416_CR4","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0286264","volume":"18","author":"S Kunisawa","year":"2023","unstructured":"Kunisawa S. Postoperative mortality analysis on nationwide data from diagnosis procedure combination database in Japan. PLoS ONE. 2023;18:e0286264.","journal-title":"PLoS ONE"},{"key":"1416_CR5","unstructured":"Ministry of Health L and W. Report on the results of the \u2018Discharged Patients Survey\u2019 conducted for the evaluation and verification of DPC (DPC no Hyouka Kensho tou ni kakaru Chousa 'Taiinnkanjachousa\" no Kekkahoukoku ni tsuite. https:\/\/www.mhlw.go.jp\/stf\/shingi\/shingi-chuo_128164.html. Accessed 10 Apr 2026. (in Japanese)"},{"key":"1416_CR6","unstructured":"Ministry of Health L and W. [NDB] Website regarding the use of the Anonymous database of health insurance and related information (National Database of Health Insurance Claims). https:\/\/www.mhlw.go.jp\/stf\/seisakunitsuite\/bunya\/kenkou_iryou\/iryouhoken\/reseputo\/. Accessed 11 Apr 2026. (in Japanese)"},{"key":"1416_CR7","unstructured":"Ministry of Health L and W. (2025) 29th Meeting of the expert committee on the provision of anonymised medical information, etc. \u2013 Supporting documents. https:\/\/www.mhlw.go.jp\/stf\/index_00104.html. Accessed 15 Apr 2026. (in Japanese)"}],"container-title":["Japanese Journal of Ophthalmology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1007\/s10384-026-01416-2.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/article\/10.1007\/s10384-026-01416-2","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1007\/s10384-026-01416-2.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T04:50:09Z","timestamp":1788238209000},"score":1,"resource":{"primary":{"URL":"https:\/\/link.springer.com\/10.1007\/s10384-026-01416-2"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,1]]},"references-count":7,"alternative-id":["1416"],"URL":"https:\/\/doi.org\/10.1007\/s10384-026-01416-2","relation":{},"ISSN":["0021-5155","1613-2246"],"issn-type":[{"value":"0021-5155","type":"print"},{"value":"1613-2246","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,1]]},"assertion":[{"value":"16 April 2026","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"14 July 2026","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"1 September 2026","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"S. Kunisawa, None; Y. Imanaka, None.","order":1,"name":"Ethics","label":"Conflict of interest","group":{"name":"EthicsHeading","label":"Declarations"}}]}}