Use of Corneal Power-Specific Constants to Improve the Accuracy of the SRK/T Formula
DC Field | Value | Language |
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dc.contributor.author | Eom, Youngsub | - |
dc.contributor.author | Kang, Su-Yeon | - |
dc.contributor.author | Song, Jong-Suk | - |
dc.contributor.author | Kim, Hyo Myung | - |
dc.date.accessioned | 2021-09-06T03:54:42Z | - |
dc.date.available | 2021-09-06T03:54:42Z | - |
dc.date.created | 2021-06-14 | - |
dc.date.issued | 2013-03 | - |
dc.identifier.issn | 0161-6420 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/103840 | - |
dc.description.abstract | Purpose: To evaluate the effect of average corneal power (K) and axial length (AL) in a data-adjusted A-constant for improving the refractive outcome in the Sanders-Retzlaff-Kraff (SRK)/T formula. Design: Retrospective, consecutive, case series. Participants: A total of 637 patients (637 eyes) who underwent uncomplicated phacoemulsification with implantation of the Acrysof IQ (IQ; Alcon, Fort Worth, TX; 314 eyes) or Akreos AO (AO; Bausch & Lomb, Rochester, NY; 323 eyes) intraocular lens (IOL) by a single surgeon. Methods: The correlation among the K, AL, and predicted refractive error in the SRK/T formula was analyzed. Patients were divided into 2 subgroups, the first to calculate the different data-adjusted A-constants based on the K and the second to compare the median absolute error (MedAE) based on different A-constants with the traditional A-constant in the SRK/T formula. Main Outcome Measures: The data-adjusted A-constant and the MedAE (diopters [D]). Results: The data-adjusted A-constant showed a decreasing trend as K increased. The data-adjusted A-constant was 119.04 in the IQ group and 118.27 in the AO group. The calculated A-constant was 119.33 in the IQ group and 118.57 in the AO group when the cornea was flatter than 43.0 D and 43.2 D, respectively. The A-constant was 118.71 in the IQ group and 117.96 in the AO group when the cornea was steeper than or equal to 44.7 D and 45.0 D, respectively. The MedAE decreased from 0.29 D to 0.23 D in the IQ group (P = 0.001) and from 0.44 D to 0.38 D in the AO group (P < 0.001) when different A-constants were used. The MedAE further decreased from 0.36 D to 0.24 D in the IQ group (P = 0.005) and from 0.58 D to 0.37 D in the AO group (P < 0.001) when subjects with K 1.00 D or more above or 1.00 D below the most accurate K in each group were compared. Conclusions: For a steep cornea, the calculated A-constant was smaller than that of the entire K, but for a flat cornea, a larger A-constant was calculated. Using different A-constants based on the K improved the refraction outcomes relying on the SRK/T formula. Financial Disclosure(s): The author(s) have no proprietary or commercial interest in any materials discussed in this article. Ophthalmology 2013;120:477-481 (C) 2013 by the American Academy of Ophthalmology. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER SCIENCE INC | - |
dc.subject | INTRAOCULAR-LENS POWER | - |
dc.subject | ANTERIOR-CHAMBER DEPTH | - |
dc.subject | REFRACTIVE OUTCOMES | - |
dc.subject | CATARACT-SURGERY | - |
dc.subject | 2ND EYE | - |
dc.title | Use of Corneal Power-Specific Constants to Improve the Accuracy of the SRK/T Formula | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Eom, Youngsub | - |
dc.contributor.affiliatedAuthor | Song, Jong-Suk | - |
dc.contributor.affiliatedAuthor | Kim, Hyo Myung | - |
dc.identifier.doi | 10.1016/j.ophtha.2012.09.008 | - |
dc.identifier.scopusid | 2-s2.0-84875216376 | - |
dc.identifier.wosid | 000315738200009 | - |
dc.identifier.bibliographicCitation | OPHTHALMOLOGY, v.120, no.3, pp.477 - 481 | - |
dc.relation.isPartOf | OPHTHALMOLOGY | - |
dc.citation.title | OPHTHALMOLOGY | - |
dc.citation.volume | 120 | - |
dc.citation.number | 3 | - |
dc.citation.startPage | 477 | - |
dc.citation.endPage | 481 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Ophthalmology | - |
dc.relation.journalWebOfScienceCategory | Ophthalmology | - |
dc.subject.keywordPlus | INTRAOCULAR-LENS POWER | - |
dc.subject.keywordPlus | ANTERIOR-CHAMBER DEPTH | - |
dc.subject.keywordPlus | REFRACTIVE OUTCOMES | - |
dc.subject.keywordPlus | CATARACT-SURGERY | - |
dc.subject.keywordPlus | 2ND EYE | - |
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