{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T09:37:51Z","timestamp":1780047471482,"version":"3.53.1"},"reference-count":59,"publisher":"Public Library of Science (PLoS)","issue":"12","license":[{"start":{"date-parts":[[2022,12,7]],"date-time":"2022-12-07T00:00:00Z","timestamp":1670371200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:sec id=\"sec001\">\n<jats:title>Purpose<\/jats:title>\n<jats:p>The Catquest-9SF questionnaire is a tool measuring visual disability and vision-related limitation in patients\u2019 daily activities. The primary objective of this study was the validation of Catquest-9SF in a Greek-speaking cataract population.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec002\">\n<jats:title>Methods<\/jats:title>\n<jats:p>The questionnaire was translated into Greek and translated back into English. A pre-final Greek version was formed and tested by 10 Greek-English bilingual participants and by the translation team, and the final version was produced. Patients scheduled for cataract surgery completed the questionnaire preoperatively and postoperatively. Rasch analysis was performed for the assessment of the Catquest-9SF psychometric properties, including response category ordering, item fit statistics, principal components analysis, precision, differential item functioning and targeting for preoperative and postoperative data collectively.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec003\">\n<jats:title>Results<\/jats:title>\n<jats:p>A total of 100 (55 men, 45 women, mean age = 71.94\u00b16.63) cataract patients completed the Greek version of Catquest-9SF questionnaire preoperatively and postoperatively. Rasch analysis showed a significant improvement in the median person Rasch score from \u22121.49 preoperatively to \u22124.71 logits postoperatively, while the effect size was 1.3. Unidimensionality was confirmed since infit and outfit mean square values varied between 0.66 and 1.37. Rasch analysis showed good precision and separation ability (Person Separation Index of 3.28, and Person Reliability of 0.92). Four response categories were found for all items. The item-person means difference was -1.83 logits. The difference between preoperative and postoperative Catquest-9SF logit score was positively correlated with preoperative Catquest-9SF logit score (coeff. = 0.798, p&lt;0.0001) and negatively correlated with postoperative spherical equivalent (coeff. = -0.825, p = 0.011).<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec004\">\n<jats:title>Conclusion<\/jats:title>\n<jats:p>The Greek version of Catquest-9SF proved to be reliable, valid, unidimensional and responsive to changes after cataract surgery presenting good psychometric properties for cataract patients. Some postoperative mistargeting was found indicating that the tasks were easily performed by respondents after cataract surgery.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec005\">\n<jats:title>Trial registration<\/jats:title>\n<jats:p><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/clinicaltrials.gov\/ct2\/show\/NCT05323526\" xlink:type=\"simple\">NCT05323526<\/jats:ext-link> -retrospectively registered.<\/jats:p>\n<\/jats:sec>","DOI":"10.1371\/journal.pone.0278683","type":"journal-article","created":{"date-parts":[[2022,12,7]],"date-time":"2022-12-07T18:35:35Z","timestamp":1670438135000},"page":"e0278683","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":4,"title":["Catquest-9SF questionnaire: Validation in a Greek-speaking population using Rasch analysis"],"prefix":"10.1371","volume":"17","author":[{"given":"Panagiotis","family":"Nanos","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vasiliki","family":"Kouteliari","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eirini-Kanella","family":"Panagiotopoulou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikolaos","family":"Papadopoulos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5628-3765","authenticated-orcid":true,"given":"Panagiota","family":"Ntonti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4364-1943","authenticated-orcid":true,"given":"Georgios","family":"Labiris","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2022,12,7]]},"reference":[{"key":"pone.0278683.ref001","doi-asserted-by":"crossref","first-page":"614","DOI":"10.1136\/bjophthalmol-2011-300539","article-title":"Global estimates of visual impairment: 2010","volume":"5","author":"D Pascolini","year":"2012","journal-title":"Br J Ophthalmol"},{"key":"pone.0278683.ref002","unstructured":"National Eye Institute\u2014NEI. Cataracts. 2022 Apr 21 [Cited 2022 Apr 25] https:\/\/www.nei.nih.gov\/health\/cataract\/cataract_facts."},{"key":"pone.0278683.ref003","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1186\/s40662-015-0023-5","article-title":"Predictability of refraction following immediate sequential bilateral cataract surgery (ISBCS) performed under general anaesthesia","volume":"2","author":"I Guber","year":"2015","journal-title":"Eye Vis (Lond)"},{"key":"pone.0278683.ref004","doi-asserted-by":"crossref","first-page":"8","DOI":"10.1186\/s40662-015-0019-1","article-title":"The European registry of quality outcomes for cataract and refractive surgery (EUREQUO): a database study of trends in volumes, surgical techniques an doutcomes of refractive surgery","volume":"2","author":"M Lundstrom","year":"2015","journal-title":"Eye Vis (Lond)"},{"key":"pone.0278683.ref005","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1186\/s40662-015-0017-3","article-title":"Intraocular lens power calculation following laser refractive surgery","volume":"2","author":"C Hodge","year":"2015","journal-title":"Eye Vis (Lond)"},{"key":"pone.0278683.ref006","doi-asserted-by":"crossref","first-page":"265","DOI":"10.1016\/j.ajo.2003.08.003","article-title":"The determinants of participation in activities of daily living in people with impaired vision","volume":"137","author":"EL Lamoureux","year":"2004","journal-title":"Am J Ophthalmol"},{"key":"pone.0278683.ref007","doi-asserted-by":"crossref","first-page":"479","DOI":"10.1038\/sj.eye.6702854","article-title":"Change in health-related quality of life after cataract surgery in a population-based sample","volume":"22","author":"S Chandrasekaran","year":"2008","journal-title":"Eye (Lond)"},{"key":"pone.0278683.ref008","doi-asserted-by":"crossref","first-page":"115","DOI":"10.14712\/18059694.2018.129","article-title":"Patients\u2019 Expectations in Lens Extraction Surgery: a Systematic Review","volume":"61","author":"EK Panagiotopoulou","year":"2018","journal-title":"Acta Medica (Hradec Kralove)"},{"key":"pone.0278683.ref009","doi-asserted-by":"crossref","first-page":"1735","DOI":"10.1007\/s00417-015-3038-7","article-title":"Determinants of patient satisfaction and function related to vision following cataract surgery in eyes with no visually consequential ocular co-morbidity","volume":"253","author":"C Kirwan","year":"2015","journal-title":"Graefes Arch Clin Exp Ophthalmol"},{"key":"pone.0278683.ref010","doi-asserted-by":"crossref","first-page":"516","DOI":"10.1097\/00006324-200208000-00015","article-title":"The measurement of vision disability","volume":"79","author":"RW Massof","year":"2002","journal-title":"Optom Vis Sci"},{"key":"pone.0278683.ref011","doi-asserted-by":"crossref","first-page":"630","DOI":"10.1001\/archopht.1994.01090170074026","article-title":"The VF-14. 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