{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T21:04:39Z","timestamp":1790283879612,"version":"4.1.0"},"reference-count":51,"publisher":"Springer Science and Business Media LLC","issue":"4","license":[{"start":{"date-parts":[[2021,5,17]],"date-time":"2021-05-17T00:00:00Z","timestamp":1621209600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100012155","name":"National Institute for Medical Research Development","doi-asserted-by":"publisher","award":["963660"],"award-info":[{"award-number":["963660"]}],"id":[{"id":"10.13039\/501100012155","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Ophthalmic Physiologic Optic"],"published-print":{"date-parts":[[2021,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>To determine the distribution of the corneal asphericity coefficient (Q value) and related factors in an Iranian geriatric population.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This population\u2010based study\u00a0was conducted in 2019 in Tehran, using\u00a0stratified multistage random cluster sampling. The study population was \u226560\u00a0years of age. Participants underwent corneal imaging\u00a0using a Pentacam HR. Mean keratometry, corneal astigmatism, central corneal thickness, anterior chamber depth and the overall anterior and posterior Q values (for 8\u00a0mm chord diameter)\u00a0were recorded. Axial length measurements were performed using the IOL Master 500.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>2457 eyes of 2457 individuals were analysed. The mean age was 67.3\u00a0\u00b1\u00a05.82\u00a0years and 1479 (60.2%) were female.\u00a0The mean Q value for the anterior corneal surface was \u22120.35\u00a0\u00b1\u00a00.17 (95% CI: \u22120.35 to \u22120.34). The anterior Q value showed a statistically significant inverse relationship with axial length and mean keratometry, and a significant direct association with anterior chamber depth and corneal astigmatism. The mean posterior Q value was \u22120.41\u00a0\u00b1\u00a00.15 (95% CI: \u22120.42 to \u22120.40). The posterior Q value had a significant direct relationship with age, anterior chamber depth, mean keratometry and corneal astigmatism.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The corneal Q values in this geriatric Iranian population were more negative than the values reported in most previous studies. Corneal asphericity was greater affected by ocular biometry and corneal curvature than demographic factors and refractive status.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/opo.12831","type":"journal-article","created":{"date-parts":[[2021,5,17]],"date-time":"2021-05-17T07:07:25Z","timestamp":1621235245000},"page":"691-701","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Corneal asphericity and related factors in the geriatric population: A population\u2010based study"],"prefix":"10.1007","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2109-0856","authenticated-orcid":false,"given":"Hassan","family":"Hashemi","sequence":"first","affiliation":[{"name":"Noor Research Center for Ophthalmic Epidemiology Noor Eye Hospital Tehran 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