An evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive power
Purpose: To evaluate a method using measured values of total corneal refractive power (TCRP) for a manufacturer's online calculator by comparing it with the Barrett toric calculator (BTC) and Kane toric calculator (KTC) combined with simulated keratometry values (SimK). Methods: This was a re...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2023-01-01
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| Series: | Indian Journal of Ophthalmology |
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| Online Access: | http://www.ijo.in/article.asp?issn=0301-4738;year=2023;volume=71;issue=2;spage=541;epage=546;aulast=Yang |
| _version_ | 1797775132302770176 |
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| author | Zhi Yang Yanwen Zhou Tianru Jin Jingjing Li |
| author_facet | Zhi Yang Yanwen Zhou Tianru Jin Jingjing Li |
| author_sort | Zhi Yang |
| collection | DOAJ |
| description | Purpose: To evaluate a method using measured values of total corneal refractive power (TCRP) for a manufacturer's online calculator by comparing it with the Barrett toric calculator (BTC) and Kane toric calculator (KTC) combined with simulated keratometry values (SimK). Methods: This was a retrospective case series. Patient records were reviewed to identify the patients who had biometry with the IOL Master 700 and Pentacam recorded before toric IOL implantation and refractive follow-up data after implantation. The predicted error in residual astigmatism was calculated by vector analysis according to the calculation methods and the measurements used. Results: A total of 70 eyes of 56 patients were included. The mean absolute astigmatism prediction errors were 0.6 ± 0.32, 0.59 ± 0.35, and 0.61 ± 0.35 D for the ATCTCRP, BTCSimK, and KTCSimK calculators, respectively (P = 0.934), and the centroid of the prediction errors were 0.3 D @ 178°, 0.11 D @ 102°, and 0.09 D @ 147°, respectively (P = 0.23). In the with-the-rule subgroup, the centroid of the prediction error was 0.34 D @ 176° for ATCTCRP and was the highest among the three calculation methods (P = 0.046). Conclusion: The ATCTCRP, BTCSimK, and KTCSimK calculators had similar performance with regards to their astigmatism prediction accuracy. The ATCTCRP calculator combined with 4.0-mm apex/ring readings of TCRP was slightly intended to result in against-the-rule residual astigmatism. |
| first_indexed | 2024-03-12T22:31:17Z |
| format | Article |
| id | doaj.art-1a34e9a8e73c4a76b1d4d0a8440d2b1c |
| institution | Directory Open Access Journal |
| issn | 0301-4738 1998-3689 |
| language | English |
| last_indexed | 2024-03-12T22:31:17Z |
| publishDate | 2023-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Indian Journal of Ophthalmology |
| spelling | doaj.art-1a34e9a8e73c4a76b1d4d0a8440d2b1c2023-07-21T15:04:35ZengWolters Kluwer Medknow PublicationsIndian Journal of Ophthalmology0301-47381998-36892023-01-0171254154610.4103/ijo.IJO_1539_22An evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive powerZhi YangYanwen ZhouTianru JinJingjing LiPurpose: To evaluate a method using measured values of total corneal refractive power (TCRP) for a manufacturer's online calculator by comparing it with the Barrett toric calculator (BTC) and Kane toric calculator (KTC) combined with simulated keratometry values (SimK). Methods: This was a retrospective case series. Patient records were reviewed to identify the patients who had biometry with the IOL Master 700 and Pentacam recorded before toric IOL implantation and refractive follow-up data after implantation. The predicted error in residual astigmatism was calculated by vector analysis according to the calculation methods and the measurements used. Results: A total of 70 eyes of 56 patients were included. The mean absolute astigmatism prediction errors were 0.6 ± 0.32, 0.59 ± 0.35, and 0.61 ± 0.35 D for the ATCTCRP, BTCSimK, and KTCSimK calculators, respectively (P = 0.934), and the centroid of the prediction errors were 0.3 D @ 178°, 0.11 D @ 102°, and 0.09 D @ 147°, respectively (P = 0.23). In the with-the-rule subgroup, the centroid of the prediction error was 0.34 D @ 176° for ATCTCRP and was the highest among the three calculation methods (P = 0.046). Conclusion: The ATCTCRP, BTCSimK, and KTCSimK calculators had similar performance with regards to their astigmatism prediction accuracy. The ATCTCRP calculator combined with 4.0-mm apex/ring readings of TCRP was slightly intended to result in against-the-rule residual astigmatism.http://www.ijo.in/article.asp?issn=0301-4738;year=2023;volume=71;issue=2;spage=541;epage=546;aulast=Yangastigmatismbarrettcalculationcataractkanetotal corneal refractive power |
| spellingShingle | Zhi Yang Yanwen Zhou Tianru Jin Jingjing Li An evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive power Indian Journal of Ophthalmology astigmatism barrett calculation cataract kane total corneal refractive power |
| title | An evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive power |
| title_full | An evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive power |
| title_fullStr | An evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive power |
| title_full_unstemmed | An evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive power |
| title_short | An evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive power |
| title_sort | evaluation of the accuracy of toric intraocular lens power calculation based on measured total corneal refractive power |
| topic | astigmatism barrett calculation cataract kane total corneal refractive power |
| url | http://www.ijo.in/article.asp?issn=0301-4738;year=2023;volume=71;issue=2;spage=541;epage=546;aulast=Yang |
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