Vector analysis investigation of toric intraocular lens with no deviation from the intended axis
Atsushi Kawahara,1,2 Yoshinori Takayanagi1 1Takayanagi Clinic, Kushiro, 2Sapporo Kato Eye Clinic, Sapporo, Hokkaido, Japan Aim: The aim of this research was to evaluate vector analysis after implantation of toric intraocular lenses (IOLs) without deviation from the intended axis. Methods: The stud...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Dove Medical Press
2016-11-01
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| Series: | Clinical Ophthalmology |
| Subjects: | |
| Online Access: | https://www.dovepress.com/vector--analysis-investigation-of-toric-intraocular-lens-with-no-devia-peer-reviewed-article-OPTH |
| _version_ | 1819013532332589056 |
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| author | Kawahara A Takayanagi Y |
| author_facet | Kawahara A Takayanagi Y |
| author_sort | Kawahara A |
| collection | DOAJ |
| description | Atsushi Kawahara,1,2 Yoshinori Takayanagi1 1Takayanagi Clinic, Kushiro, 2Sapporo Kato Eye Clinic, Sapporo, Hokkaido, Japan Aim: The aim of this research was to evaluate vector analysis after implantation of toric intraocular lenses (IOLs) without deviation from the intended axis. Methods: The study included 18 eyes of 16 patients who underwent cataract surgery with the insertion of a toric implant (AcrySof IQ Toric). The postoperative IOL meridian placement completely corresponded to that planned. Using vector analysis, surgically induced astigmatism (SIA) was derived from the refractive outcome versus the predicted postoperative keratometric astigmatism and was compared with targeted induced astigmatism (TIA). The difference vector (DV) was derived by calculating the vector expression of the remaining astigmatic change. Results: The mean postoperative remaining refractive astigmatism of 0.73±0.55 diopters (D) was achieved versus the mean target of 0.44±0.28 D. There was a difference of 0.29 D between the target and achieved values. The mean SIA value was 1.90±0.99 D compared with the mean TIA value of 2.00±0.85 D. The mean DV value was 0.87±0.56 D. The astigmatism correction index (SIA/TIA) was 0.95, which was near the ideal value of 1. The index of success (DV/TIA) was 0.44, which was far from the ideal value of 0. Conclusion: The implantation of toric IOLs is an effective, predictable method for astigmatic correction. However, some remaining astigmatism is present even if toric IOLs are placed accurately. Keywords: cataract surgery, astigmatism, toric intraocular lens, alpins method, toric calculator, remaining astigmatism |
| first_indexed | 2024-12-21T02:01:26Z |
| format | Article |
| id | doaj.art-6ab982f4eef84513a392948b4eaa4e95 |
| institution | Directory Open Access Journal |
| issn | 1177-5483 |
| language | English |
| last_indexed | 2024-12-21T02:01:26Z |
| publishDate | 2016-11-01 |
| publisher | Dove Medical Press |
| record_format | Article |
| series | Clinical Ophthalmology |
| spelling | doaj.art-6ab982f4eef84513a392948b4eaa4e952022-12-21T19:19:38ZengDove Medical PressClinical Ophthalmology1177-54832016-11-01Volume 102199220329814Vector analysis investigation of toric intraocular lens with no deviation from the intended axisKawahara ATakayanagi YAtsushi Kawahara,1,2 Yoshinori Takayanagi1 1Takayanagi Clinic, Kushiro, 2Sapporo Kato Eye Clinic, Sapporo, Hokkaido, Japan Aim: The aim of this research was to evaluate vector analysis after implantation of toric intraocular lenses (IOLs) without deviation from the intended axis. Methods: The study included 18 eyes of 16 patients who underwent cataract surgery with the insertion of a toric implant (AcrySof IQ Toric). The postoperative IOL meridian placement completely corresponded to that planned. Using vector analysis, surgically induced astigmatism (SIA) was derived from the refractive outcome versus the predicted postoperative keratometric astigmatism and was compared with targeted induced astigmatism (TIA). The difference vector (DV) was derived by calculating the vector expression of the remaining astigmatic change. Results: The mean postoperative remaining refractive astigmatism of 0.73±0.55 diopters (D) was achieved versus the mean target of 0.44±0.28 D. There was a difference of 0.29 D between the target and achieved values. The mean SIA value was 1.90±0.99 D compared with the mean TIA value of 2.00±0.85 D. The mean DV value was 0.87±0.56 D. The astigmatism correction index (SIA/TIA) was 0.95, which was near the ideal value of 1. The index of success (DV/TIA) was 0.44, which was far from the ideal value of 0. Conclusion: The implantation of toric IOLs is an effective, predictable method for astigmatic correction. However, some remaining astigmatism is present even if toric IOLs are placed accurately. Keywords: cataract surgery, astigmatism, toric intraocular lens, alpins method, toric calculator, remaining astigmatismhttps://www.dovepress.com/vector--analysis-investigation-of-toric-intraocular-lens-with-no-devia-peer-reviewed-article-OPTHcataract surgeryastigmatismtoric intraocular lens |
| spellingShingle | Kawahara A Takayanagi Y Vector analysis investigation of toric intraocular lens with no deviation from the intended axis Clinical Ophthalmology cataract surgery astigmatism toric intraocular lens |
| title | Vector analysis investigation of toric intraocular lens with no deviation from the intended axis |
| title_full | Vector analysis investigation of toric intraocular lens with no deviation from the intended axis |
| title_fullStr | Vector analysis investigation of toric intraocular lens with no deviation from the intended axis |
| title_full_unstemmed | Vector analysis investigation of toric intraocular lens with no deviation from the intended axis |
| title_short | Vector analysis investigation of toric intraocular lens with no deviation from the intended axis |
| title_sort | vector analysis investigation of toric intraocular lens with no deviation from the intended axis |
| topic | cataract surgery astigmatism toric intraocular lens |
| url | https://www.dovepress.com/vector--analysis-investigation-of-toric-intraocular-lens-with-no-devia-peer-reviewed-article-OPTH |
| work_keys_str_mv | AT kawaharaa vectoranalysisinvestigationoftoricintraocularlenswithnodeviationfromtheintendedaxis AT takayanagiy vectoranalysisinvestigationoftoricintraocularlenswithnodeviationfromtheintendedaxis |