Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard Keratometry
Hany Ahmed Helaly, Amr Mohamed Elhady, Osama Ramadan Elnaggar Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, EgyptCorrespondence: Hany Ahmed Helaly, Ophthalmology Department, Faculty of Medicine, Alexandria University, 30 Roshdy Street, Roshdy, Alexandria, Egypt, T...
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| Format: | Article |
| Language: | English |
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Dove Medical Press
2023-08-01
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| Series: | Clinical Ophthalmology |
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| Online Access: | https://www.dovepress.com/accuracy-of-traditional-and-modern-formulas-for-intraocular-lens-power-peer-reviewed-fulltext-article-OPTH |
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| author | Helaly HA Elhady AM Elnaggar OR |
| author_facet | Helaly HA Elhady AM Elnaggar OR |
| author_sort | Helaly HA |
| collection | DOAJ |
| description | Hany Ahmed Helaly, Amr Mohamed Elhady, Osama Ramadan Elnaggar Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, EgyptCorrespondence: Hany Ahmed Helaly, Ophthalmology Department, Faculty of Medicine, Alexandria University, 30 Roshdy Street, Roshdy, Alexandria, Egypt, Tel +201225466733, Email hany209209@yahoo.comPurpose: To compare the accuracy of multiple traditional and modern intraocular lens (IOL) power calculation formulas in post-radial keratotomy (RK) patients undergoing cataract surgery.Methods: This retrospective case series included 50 eyes with prior RK who underwent routine phacoemulsification surgery with single-piece acrylic IOL implantation (A constant = 118.8). Outcomes of multiple formulas were calculated. Included formulas were SRK/T, Holladay 1, Holladay 2, Haigis, Barrett True-K, Haigis and Barrett True-K (target refraction of 0.50 D), Barrett Universal II, Kane, PEARL-DGS, Shammas no history, DK SRK/T, DK SRK/T (target refraction of 0.50 D), Double K (DK) Holladay 1, and DK Holladay 1 (target refraction of 0.50 D). Averages of multiple combinations of best-performing single formulas were calculated. Primary outcome is mean absolute error (MAE).Results: Haigis (with − 0.50 D target refraction) and DK SRK/T showed the lowest mean and median absolute errors (MedAE) followed by Haigis, Barrett True-K, and Barrett True-K (with − 0.50 D target refraction). Combinations of 3, 4, or 5 of best performing single formulas yielded good results with > 60% of cases within +0.50 D of intended refraction and MAE around 0.50 D. The best performing formulas with flatter K readings were PEARL-DGS and Haigis (with additional − 0.50 D target refraction) with MAE of 0.72 + 0.71 D and 0.70 + 0.70 D, respectively, followed by Barrett True-K (with intended − 0.50 D target refraction) with MAE of 0.75 + 0.63 D.Conclusion: Using an average of three or more Haigis (with − 0.50 D target refraction), the Barrett True-K, DK Holladay 1, and DK SRK/T formulas showed better outcomes than using a single formula for IOLMaster 700 standard K readings. The PEARL-DGS formula showed better accuracy in eyes with flatter K readings (< 38 D).Keywords: radial keratotomy, IOL calculation, PEARL-DGS, Barrett True-K, DK Holladay 1, DK SRK/T |
| first_indexed | 2024-03-12T11:39:49Z |
| format | Article |
| id | doaj.art-a5a13ef283484f84bf2ff0d7904e8b5e |
| institution | Directory Open Access Journal |
| issn | 1177-5483 |
| language | English |
| last_indexed | 2024-03-12T11:39:49Z |
| publishDate | 2023-08-01 |
| publisher | Dove Medical Press |
| record_format | Article |
| series | Clinical Ophthalmology |
| spelling | doaj.art-a5a13ef283484f84bf2ff0d7904e8b5e2023-08-31T19:08:37ZengDove Medical PressClinical Ophthalmology1177-54832023-08-01Volume 172589259786323Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard KeratometryHelaly HAElhady AMElnaggar ORHany Ahmed Helaly, Amr Mohamed Elhady, Osama Ramadan Elnaggar Ophthalmology Department, Faculty of Medicine, Alexandria University, Alexandria, EgyptCorrespondence: Hany Ahmed Helaly, Ophthalmology Department, Faculty of Medicine, Alexandria University, 30 Roshdy Street, Roshdy, Alexandria, Egypt, Tel +201225466733, Email hany209209@yahoo.comPurpose: To compare the accuracy of multiple traditional and modern intraocular lens (IOL) power calculation formulas in post-radial keratotomy (RK) patients undergoing cataract surgery.Methods: This retrospective case series included 50 eyes with prior RK who underwent routine phacoemulsification surgery with single-piece acrylic IOL implantation (A constant = 118.8). Outcomes of multiple formulas were calculated. Included formulas were SRK/T, Holladay 1, Holladay 2, Haigis, Barrett True-K, Haigis and Barrett True-K (target refraction of 0.50 D), Barrett Universal II, Kane, PEARL-DGS, Shammas no history, DK SRK/T, DK SRK/T (target refraction of 0.50 D), Double K (DK) Holladay 1, and DK Holladay 1 (target refraction of 0.50 D). Averages of multiple combinations of best-performing single formulas were calculated. Primary outcome is mean absolute error (MAE).Results: Haigis (with − 0.50 D target refraction) and DK SRK/T showed the lowest mean and median absolute errors (MedAE) followed by Haigis, Barrett True-K, and Barrett True-K (with − 0.50 D target refraction). Combinations of 3, 4, or 5 of best performing single formulas yielded good results with > 60% of cases within +0.50 D of intended refraction and MAE around 0.50 D. The best performing formulas with flatter K readings were PEARL-DGS and Haigis (with additional − 0.50 D target refraction) with MAE of 0.72 + 0.71 D and 0.70 + 0.70 D, respectively, followed by Barrett True-K (with intended − 0.50 D target refraction) with MAE of 0.75 + 0.63 D.Conclusion: Using an average of three or more Haigis (with − 0.50 D target refraction), the Barrett True-K, DK Holladay 1, and DK SRK/T formulas showed better outcomes than using a single formula for IOLMaster 700 standard K readings. The PEARL-DGS formula showed better accuracy in eyes with flatter K readings (< 38 D).Keywords: radial keratotomy, IOL calculation, PEARL-DGS, Barrett True-K, DK Holladay 1, DK SRK/Thttps://www.dovepress.com/accuracy-of-traditional-and-modern-formulas-for-intraocular-lens-power-peer-reviewed-fulltext-article-OPTHradial keratotomyiol calculationpearl-dgsbarrett true-kdk holladay 1and dk srk/t. |
| spellingShingle | Helaly HA Elhady AM Elnaggar OR Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard Keratometry Clinical Ophthalmology radial keratotomy iol calculation pearl-dgs barrett true-k dk holladay 1 and dk srk/t. |
| title | Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard Keratometry |
| title_full | Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard Keratometry |
| title_fullStr | Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard Keratometry |
| title_full_unstemmed | Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard Keratometry |
| title_short | Accuracy of Traditional and Modern Formulas for Intraocular Lens Power Calculation After Radial Keratotomy Using Standard Keratometry |
| title_sort | accuracy of traditional and modern formulas for intraocular lens power calculation after radial keratotomy using standard keratometry |
| topic | radial keratotomy iol calculation pearl-dgs barrett true-k dk holladay 1 and dk srk/t. |
| url | https://www.dovepress.com/accuracy-of-traditional-and-modern-formulas-for-intraocular-lens-power-peer-reviewed-fulltext-article-OPTH |
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