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Shetty N, Sathe P, Aishwarya, Francis M, Shetty R. Comparison of intraocular lens power prediction by American Society of Cataract and Refractive Surgery formulas and Barrett True-K TK in eyes with prior laser refractive surgery. Indian J Ophthalmol 2024; 72:1210-1213. [PMID: 39078967 PMCID: PMC11451800 DOI: 10.4103/ijo.ijo_2758_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 02/02/2024] [Accepted: 04/15/2024] [Indexed: 10/06/2024] Open
Abstract
PURPOSE To evaluate the prediction accuracy of various intraocular lens (IOL) power calculation formulas on American Society of Cataract and Refractive Surgery (ASCRS) calculator and Barrett True-K total keratometry (TK) in eyes with previous laser refractive surgery for myopia. METHODS This retrospective study included eyes with history of myopic laser refractive surgery, which have undergone clear or cataractous lens extraction by phacoemulsification followed by IOL implantation. Those who underwent uneventful crystalline lens extraction were included. Eyes with any complication of refractive surgery or those with eventful lens extraction procedure and those who were lost to follow-up were excluded. Formulas compared were Wang-Koch-Maloney, Shammas, Haigis-L, Barrett True-K no-history formula, ASCRS average power, ASCRS maximum power on the ASCRS post-refractive calculator and the IOLMaster 700 Barrett True-K TK. Prediction error was calculated as the difference between the implanted IOL power and the predicted power by various formulae available on ASCRS online calculator. RESULTS Forty post-myopic laser-refractive surgery eyes of 26 patients were included. Friedman's test revealed that Shammas formula, Barrett True-K, and ASCRS maximum power were significantly different from all other formulas (P < 0.00001 for each). Median absolute error (MedAE) was the least for Shammas and Barrett True-K TK formulas (0.28 [0.14, 0.36] and 0.28 [0.21, 0.39], respectively) and the highest for Wang-Koch-Maloney (1.29 [0.97, 1.61]). Shammas formula had the least variance (0.14), while Wang-Koch-Maloney formula had the maximum variance (2.66). CONCLUSION In post-myopic laser refractive surgery eyes, Shammas formula and Barrett True-K TK no-history formula on ASCRS calculator are more accurate in predicting IOL powers.
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Affiliation(s)
- Naren Shetty
- Department of Cataract and Refractive Lens Services, Narayana Nethralaya, Bengaluru, Karnataka, India
| | - Priyanka Sathe
- Department of Cataract and Refractive Lens Services, Narayana Nethralaya, Bengaluru, Karnataka, India
| | - Aishwarya
- Department of Cataract and Refractive Lens Services, Narayana Nethralaya, Bengaluru, Karnataka, India
| | - Mathew Francis
- Imaging, Biomechanics and Mathematical Modelling Solutions, Narayana Nethralaya, Bengaluru, Karnataka, India
| | - Rohit Shetty
- Department of Cataract and Refractive Lens Services, Narayana Nethralaya, Bengaluru, Karnataka, India
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Cao X, Zhang J, Han W. A Comparative Study of the Effect of Femtosecond Laser-Assisted Cataract Surgery on Corneal Astigmatism in Post-LASIK Eyes and Virgin Eyes. Clin Ophthalmol 2024; 18:1655-1666. [PMID: 38863679 PMCID: PMC11165232 DOI: 10.2147/opth.s466201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Accepted: 05/29/2024] [Indexed: 06/13/2024] Open
Abstract
Purpose To evaluate and compare the effect of femtosecond laser-assisted cataract surgery on corneal astigmatism in post-LASIK eyes and virgin eyes. Patients and Methods Patients who underwent femtosecond laser-assisted cataract surgery were included in the study and categorized into two groups: Group A, consisting of patients with post-LASIK eyes, and Group B, consisting of patients with virgin eyes. Visual acuity, corneal astigmatism, and surgically induced astigmatism (SIA) were evaluated. Additionally, the correlation between SIA and preoperative corneal astigmatism, mean corneal curvature, and central corneal thickness was also analyzed. Results A total of 168 eyes were enrolled in this study, with 62 eyes in Group A and 106 eyes in Group B. Significant differences in corneal astigmatism and SIA were observed between the two groups in the early postoperative period following cataract surgery (P<0.05). However, there was no significant difference at 6 months postoperatively (P>0.05). Corneal astigmatism demonstrated an against-The-rule shift in both groups postoperatively. No significant correlation was identified between SIA and preoperative corneal astigmatism, corneal curvature or corneal thickness. Additionally, there was no significant difference observed between the two groups in terms of uncorrected distance visual acuity (UDVA) at 6 months postoperatively. Conclusion The effect of femtosecond laser-assisted cataract surgery on corneal astigmatism in post-LASIK eyes and virgin eyes was different in the early postoperative period. However, there was no significant difference at 6 months postoperatively. The post-LASIK eyes exhibited a delayed recovery compared to the virgin eyes.
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Affiliation(s)
- Xinfang Cao
- Eye Centre, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, People’s Republic of China
- Department of Ophthalmology, Hangzhou MSK Eye Hospital, Hangzhou, Zhejiang Province, People’s Republic of China
| | - Jun Zhang
- Department of Ophthalmology, Hangzhou MSK Eye Hospital, Hangzhou, Zhejiang Province, People’s Republic of China
| | - Wei Han
- Eye Centre, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, People’s Republic of China
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Pan X, Wang Y, Li Z, Ye Z. Intraocular Lens Power Calculation in Eyes After Myopic Laser Refractive Surgery and Radial Keratotomy: Bayesian Network Meta-analysis. Am J Ophthalmol 2024; 262:48-61. [PMID: 37865389 DOI: 10.1016/j.ajo.2023.09.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 08/17/2023] [Accepted: 09/27/2023] [Indexed: 10/23/2023]
Abstract
PURPOSE To compare the accuracy of formulas for calculating intraocular lens power in eyes after myopic laser refractive surgery or radial keratotomy. DESIGN Bayesian network meta-analysis. METHODS PubMed, Embase, the Cochrane Data Base of Systematic Reviews, and the Cochrane Central Register of Controlled Trials databases were searched for retrospective and prospective clinical studies published from January 1, 2012, to August 24, 2022. The outcome measurement was the percentage of eyes with a predicted error within the target refractive range (±0.50 diopter [D] or ±1.00 D). RESULTS Our meta-analysis includes 24 studies of 1172 eyes after myopic refractive surgery that use 12 formulas for intraocular lens power calculation. (1) A network meta-analysis showed that Barrett true-K no history, the optical coherence tomography (OCT) formula, and the Masket formula had a significantly higher percent of eyes within ±0.50 D of the goal than the Haigis-L formula, whereas the Wang-Koch-Maloney formula showed the poor predictability. Using an error criterion of within ±1.00 D, the same 3 formulas performed slightly better than the Haigis-L formula. Based on performance using both prediction error criteria, the Barrett true-K no history formula, OCT formula, and Masket formula showed the highest probability of ranking as the top 3 among the 12 methods. (2) A direct meta-analysis with a subset of 4 studies and 5 formulas indicated that formulas did not differ in percent success for either the ±0.5 D or ±1.0 D error range in eyes that had undergone radial keratotomy. CONCLUSIONS The OCT, Masket, and Barrett true-K no history formulas are more accurate for eyes with previous myopic laser refractive surgery, whereas no significant difference was found among the formulas for eyes that had undergone radial keratotomy.
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Affiliation(s)
- Xiaoying Pan
- From the School of Medicine, Nankai University, Tianjin (X.P.); Department of Ophthalmology, the Chinese People's Liberation Army General Hospital, Beijing (X.P., Y.W., Z.L., Z.Y.), China
| | - Yuyao Wang
- Department of Ophthalmology, Medical School of Chinese People's Liberation Army, Beijing (Y.W.); Department of Ophthalmology, the Chinese People's Liberation Army General Hospital, Beijing (X.P., Y.W., Z.L., Z.Y.), China
| | - Zhaohui Li
- Department of Ophthalmology, the Chinese People's Liberation Army General Hospital, Beijing (X.P., Y.W., Z.L., Z.Y.), China
| | - Zi Ye
- Department of Ophthalmology, the Chinese People's Liberation Army General Hospital, Beijing (X.P., Y.W., Z.L., Z.Y.), China.
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Wendelstein J, Heath M, Riaz KM, Seiler T, Cooke DL, Langenbucher A, Hoffmann P, Kohnen T. Biometry and Intraocular Lens Power Calculation in Eyes with Prior Laser Vision Correction (LVC) - A Review. Klin Monbl Augenheilkd 2022; 239:971-981. [PMID: 35973684 DOI: 10.1055/a-1896-0881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
BACKGROUND An intraocular lens (IOL) calculation in eyes that have undergone laser vision correction (LVC) poses a significant clinical issue in regards to both patient expectation and accuracy. This review aims to describe the pitfalls of IOL power calculation after LVC and give an overview of the current methods of IOL power calculation after LVC. REVIEW Problems after LVC derive from the measurement of anterior corneal radii, central corneal thickness, asphericity, and the predicted effective lens position. A central issue is that most conventional 3rd generation formulas estimate lens position amongst other parameters on keratometry, which is altered in post-LVC eyes. CONCLUSION An IOL power calculation results in eyes with prior LVC that are notably impaired in eyes without prior surgery. Effective corneal power including anterior corneal curvature, posterior corneal curvature, CCT (central corneal thickness), and asphericity is essential. Total keratometry in combination with the Barrett True-K, EVO (emmetropia verifiying optical formula), or Haigis formula is relatively uncomplicated and seems to provide good results, as does the Barrett True-K formula with anterior K values. The ASCRS ( American Society of Cataract and Refractive Surgery) calculator combines results of various formulae and averages results, which allows a direct comparison between the different methods. Tomography-based raytracing and the Kane and the Castrop formulae need to be evaluated by future studies.
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Affiliation(s)
- Jascha Wendelstein
- IROC, Institut für Refraktive und Ophthalmo-Chirurgie, Zürich, Switzerland.,Abteilung für Augenheilkunde und Optometrie, Johannes Kepler Universität Linz, Linz, Austria.,Institut für Experimentelle Ophthalmologie, Universität des Saarlandes, Homburg/Saar, Germany
| | - Michael Heath
- College of Medicine, University of Oklahoma, Norman, Oklahoma, United States
| | - Kamran M Riaz
- University of Oklahoma, Dean McGee Eye Institute, Oklahoma City, Oklahoma, United States
| | - Theo Seiler
- IROC, Institut für Refraktive und Ophthalmo-Chirurgie, Zürich, Switzerland.,Universitätsklinik für Augenheilkunde, Inselspital, Bern, Switzerland.,Klinik für Augenheilkunde, Universitätsklinikum Düsseldorf, Düsseldorf, Germany
| | - David L Cooke
- Great Lakes Eye Care, Saint Joseoph, United States.,Department of Neurology and Ophthalmology, Michigan State University, East Lansing, Michigan, United States
| | - Achim Langenbucher
- Institut für Experimentelle Ophthalmologie, Universität des Saarlandes, Homburg/Saar, Germany
| | - Peter Hoffmann
- Augen- und Laserklinik Castrop-Rauxel, Castrop-Rauxel, Germany
| | - Thomas Kohnen
- Klinik für Augenheilkunde, Goethe-Universität, Frankfurt, Germany
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