Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusis
Purpose The aim of the study was to evaluate the accuracy of corneal power measurements for intraocular lens (IOL) power calculation after myopic laser in-situ keratomileusis (LASIK). Setting The study was conducted at the Faculty of Medicine, Alexandria University, Egypt. Patients and methods The s...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2015-01-01
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| Series: | Delta Journal of Ophthalmology |
| Subjects: | |
| Online Access: | http://www.djo.eg.net/article.asp?issn=1110-9173;year=2015;volume=16;issue=1;spage=10;epage=15;aulast=El-Hifnawy |
| _version_ | 1818720587778883584 |
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| author | Mohammad A.M. El-Hifnawy Mohamed Shafik Shaheen Amr F Abou El-Kheir Hany A Helaly |
| author_facet | Mohammad A.M. El-Hifnawy Mohamed Shafik Shaheen Amr F Abou El-Kheir Hany A Helaly |
| author_sort | Mohammad A.M. El-Hifnawy |
| collection | DOAJ |
| description | Purpose
The aim of the study was to evaluate the accuracy of corneal power measurements for intraocular lens (IOL) power calculation after myopic laser in-situ keratomileusis (LASIK).
Setting
The study was conducted at the Faculty of Medicine, Alexandria University, Egypt.
Patients and methods
The study was conducted on 45 eyes that had undergone myopic LASIK previously. Corneal power was measured using manual keratometry, automated keratometry, IOLMaster, and Pentacam. Different hypothetical IOL power calculation formulas were used in each case.
Results
The steepest mean K value with manual keratometry (37.48 ± 2.86 D) followed by automated keratometry (37.31 ± 2.83 D) and the IOLMaster mean K value (37.06 ± 2.98 D) were steeper than any other mean K value measured by Pentacam. Using 4 mm Holladay equivalent K reading (EKR) with the double-K SRK/T formula, the refractive outcome was good, with 97.8% of cases within ± 2 D, 80.0% of cases within ± 1 D, and 42.2% of cases within ± 0.5 D. The best combination of formulas was ′Shammas-PL+double-K SRK/T using EKR 4 mm′.
Conclusion
Pentacam Scheimpflug imaging using EKR at 4 mm improved the accuracy of IOL power calculation in post-LASIK eyes. The best option is a combination of formulas. It is recommended to use the mean of the combination of ′Shammas-PL+double-K SRK/T with EKR 4 mm′. |
| first_indexed | 2024-12-17T20:25:13Z |
| format | Article |
| id | doaj.art-a81bdba9249a4cd9826a651cdc9d3131 |
| institution | Directory Open Access Journal |
| issn | 1110-9173 2090-4835 |
| language | English |
| last_indexed | 2024-12-17T20:25:13Z |
| publishDate | 2015-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Delta Journal of Ophthalmology |
| spelling | doaj.art-a81bdba9249a4cd9826a651cdc9d31312022-12-21T21:33:49ZengWolters Kluwer Medknow PublicationsDelta Journal of Ophthalmology1110-91732090-48352015-01-01161101510.4103/1110-9173.157780Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusisMohammad A.M. El-HifnawyMohamed Shafik ShaheenAmr F Abou El-KheirHany A HelalyPurpose The aim of the study was to evaluate the accuracy of corneal power measurements for intraocular lens (IOL) power calculation after myopic laser in-situ keratomileusis (LASIK). Setting The study was conducted at the Faculty of Medicine, Alexandria University, Egypt. Patients and methods The study was conducted on 45 eyes that had undergone myopic LASIK previously. Corneal power was measured using manual keratometry, automated keratometry, IOLMaster, and Pentacam. Different hypothetical IOL power calculation formulas were used in each case. Results The steepest mean K value with manual keratometry (37.48 ± 2.86 D) followed by automated keratometry (37.31 ± 2.83 D) and the IOLMaster mean K value (37.06 ± 2.98 D) were steeper than any other mean K value measured by Pentacam. Using 4 mm Holladay equivalent K reading (EKR) with the double-K SRK/T formula, the refractive outcome was good, with 97.8% of cases within ± 2 D, 80.0% of cases within ± 1 D, and 42.2% of cases within ± 0.5 D. The best combination of formulas was ′Shammas-PL+double-K SRK/T using EKR 4 mm′. Conclusion Pentacam Scheimpflug imaging using EKR at 4 mm improved the accuracy of IOL power calculation in post-LASIK eyes. The best option is a combination of formulas. It is recommended to use the mean of the combination of ′Shammas-PL+double-K SRK/T with EKR 4 mm′.http://www.djo.eg.net/article.asp?issn=1110-9173;year=2015;volume=16;issue=1;spage=10;epage=15;aulast=El-Hifnawycorneal powerioliol power calculationlasik |
| spellingShingle | Mohammad A.M. El-Hifnawy Mohamed Shafik Shaheen Amr F Abou El-Kheir Hany A Helaly Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusis Delta Journal of Ophthalmology corneal power iol iol power calculation lasik |
| title | Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusis |
| title_full | Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusis |
| title_fullStr | Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusis |
| title_full_unstemmed | Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusis |
| title_short | Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusis |
| title_sort | accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in situ keratomileusis |
| topic | corneal power iol iol power calculation lasik |
| url | http://www.djo.eg.net/article.asp?issn=1110-9173;year=2015;volume=16;issue=1;spage=10;epage=15;aulast=El-Hifnawy |
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