Accuracy of the Kane Formula for Intraocular Lens Power Calculation in Comparison with Existing Formulas: A Retrospective Review

Ryu, Soyoung; Jun, Ikhyun; Kim, Tae Im; Kim, Eung Kweon; Seo, Kyoung Yul

doi:10.3349/ymj.2021.62.12.1117

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…The surgically-induced astigmatism was kept into account during IOL power calculations, using biometery readings (IOL Biomaster 500). IOL power was calculated using Barrett's II Universal Formula, 15 Kane, 16 Alcon online toric calculator and Verion digital marker. The incision angle and IOL placement angle were also determined using Alcon online toric calculator and Verion digital marker.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of visual outcomes with toric intraocular lens implantation using digital marker during cataract surgery

Jeeva,

Masud,

Saeed Ali

et al. 2024

J Pak Med Assoc

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Objective: To assess the visual improvement and mean residual astigmatism in patients who underwent cataract surgery with toric intraocular lens. Method: The retrospective, observational study was conducted at the Department of Ophthalmology, Aga Khan University Hospital, Karachi, and comprised data from January 1, 2018, to December 31, 2020, related to adult patients who had regular astigmatism of at least 0.75D and underwent cataract surgery with toric intraocular lens implantation using a digital marker. The patients were followed up on post-operative days 1, 7, 30, 90 and 180. Along with age, the degree of astigmatism was noted. The visual acuity was calculated pre- and post-operatively. The mean residual astigmatism was then noted for all patients post-operatively. Data was analysed using SPSS 22. Results: The sample comprised 240 eyes of 177 patients; 99(55.9%) males and 78(44.1%) females. The mean age of the sample was 62.5±10.6 years. The mean unaided visual acuity improved post-operatively from 0.57±0.38 to 0.07±0.22 at 90 days. At the 30-day follow-up, mean residual astigmatism had reduced from 1.52±0.84 to 0.01±0.09 (p<0.001). The mean intraocular lens rotation from the intended axis was 0.73°±0.92° on day 30. Conclusion: Toric intraocular lens implantation using a digital marker could effectively reduce the post-operative cylinder, and improve the unaided visual acuity following cataract surgery. Key Words: Intraocular lens implantation, Cataract, Toric IOL, Accuracy of toric IOL.

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Section: Discussionmentioning

confidence: 99%

Evaluation of visual outcomes with toric intraocular lens implantation using digital marker during cataract surgery

Jeeva,

Masud,

Saeed Ali

et al. 2024

J Pak Med Assoc

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“…Currently, the Kane formula is gaining more and more recognition in the world literature. [ 10 , 11 , 20 - 22 , 26 ] Connell and Kane considering the accuracy of nine formulas (Hill-RBF, Kane, Holladay 2, Barrett, Olsen, Haigis, Hoffer Q, Holladay 1, and SRK/T) demonstrated that the Kane formula had the lowest mean absolute prediction error ( P < 0.001 for all formulas). However, the study involved a relatively small number of short eyes.…”

Section: Discussionmentioning

confidence: 99%

“…[ 9 , 18 , 19 ] The Kane formula stands up among them. [ 10 , 20 - 22 ] However, there is still no agreement among cataract surgeons regarding the choice of the formula.…”

Section: Introductionmentioning

confidence: 99%

Analysis of accuracy of twelve intraocular lens power calculation formulas for eyes with axial hyperopia

Stopyra¹

2023

Saudi Journal of Ophthalmology

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PURPOSE: The purpose was to compare twelve intraocular lens power calculation formulas for eyes smaller than 22.0 mm in terms of absolute error (AE), the percentage of postoperative emmetropia, and agreement interval in Bland–Altman analysis. METHODS: The data of hyperopic patients who underwent uneventful phacoemulsification between January 2016 and July 2021 were reviewed. Intraocular lens power was calculated using Holladay 1, SRK/T, Hoffer Q, Holladay 2, Haigis, Barrett Universal II, Hill-RBF, Ladas, Kane, Emmetropia Verifying Optical (EVO), Pearl-DGS, and K6 formulas. Three months after phacoemulsification, refraction was measured, and the mean AE was calculated. The percentage of patients with full visual acuity (VA) without any correction, with ± 0.25D, ±0.5D, ±0.75D, and limits of agreement for each formula was established. RESULTS: Seventy-two patients, whose ocular axial length (AL) ranged between 20.02 mm and 21.98 mm, were included. The Kane formula achieved the lowest mean AE of 0.09 ± 0.09 just before EVO (0.12 ± 0.09), Hill-RBF (0.17 ± 0.12), and Hoffer Q formulas (0.19 ± 0.16). In addition, with the Kane formula, the percentage of patients with full VA without any correction (80.6%) was the highest ahead of EVO and Hoffer Q formulas (51.5% and 50.0%, respectively). Finally, Kane, EVO, and Hill-RBF obtained the lowest agreement interval (0.4923, 0.5815, and 0.7740, respectively). CONCLUSION: The Kane formula is recommended for intraocular lens power calculation for eyeballs with the AL smaller than 22.0 mm. The EVO formula gives very promising results in regarding the accuracy of intraocular lens power for hyperopic eyes.

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“…The following supporting information can be downloaded at: https:// www.mdpi.com/article/10.3390/jcm11092456/s1, Figure S1: Flow diagram of inclusion process based on Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [17]; Table S1: Krumeich criteria for Classification of Keratoconus; Table S2: Guidelines for target refraction in patients undergoing cataract surgery based on keratoconus (KC) grade by the Krumeich criteria; Table S3: IOL formula characteristics [16,[41][42][43][44][45][46][47].…”

Section: Supplementary Materialsmentioning

confidence: 99%

Refractive Outcomes of Non-Toric and Toric Intraocular Lenses in Mild, Moderate and Advanced Keratoconus: A Systematic Review and Meta-Analysis

Yahalomi

Achiron

Hecht

et al. 2022

JCM

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Background: To perform a systematic review and meta-analysis of the refractive outcomes of non-toric and toric intraocular lenses (IOLs) in keratoconus (KC) using different IOL power calculation formulas. Methods: A systematic search was conducted to identify studies that report on refractive outcomes of different IOL power calculation formulas in KC patients undergoing cataract surgery. Inclusion criteria were primary posterior chamber non-toric and toric monofocal intraocular lens implantation, data on the degree of KC, explicit mention of the formula used for each stage of KC, and the number of eyes in each category. We calculated and compared the absolute and mean prediction errors, percentage of eyes within 0.5 D and 1 D from target, and the weighted absolute prediction errors of IOL formulas, all were given for KC degrees I–III. Results: The bibliographic search yielded 582 studies published between 1996 and 2020, 14 of which (in total 456 eyes) met the criteria: three studies on non-toric IOL (98 eyes), eight studies on toric IOLs (98 eyes) and three studies of unknown separation between non-toric and toric IOLs (260 eyes). The lowest absolute prediction error (APE) for mild, moderate, and advanced KC was seen with Kane’s IOL power formula with keratoconus adjustment. The APE for the top five IOL power formulas ranged 0.49–0.73 diopters (D) for mild (83–94%) of eyes within 1 D from the target), 1.08–1.21 D for moderate (51–57% within 1 D), and 1.44–2.86 D for advanced KC (12–48% within 1 D). Conclusions: Cataract surgery in eyes with mild-to-moderate KC generally achieves satisfactory postoperative refractive results. In patients with advanced KC, a minority of the eyes achieved spherical equivalent refraction within 1 D from the target. The Kane’s formula with keratoconus adjustment showed the best results in all KC stages.

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Accuracy of the Kane Formula for Intraocular Lens Power Calculation in Comparison with Existing Formulas: A Retrospective Review

Cited by 9 publications

References 15 publications

Evaluation of visual outcomes with toric intraocular lens implantation using digital marker during cataract surgery

Evaluation of visual outcomes with toric intraocular lens implantation using digital marker during cataract surgery

Analysis of accuracy of twelve intraocular lens power calculation formulas for eyes with axial hyperopia

Refractive Outcomes of Non-Toric and Toric Intraocular Lenses in Mild, Moderate and Advanced Keratoconus: A Systematic Review and Meta-Analysis

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