Comparison of newer Kane formula with Sanders Retzlaff Kraff/Theoretical and Barrett Universal II for calculation of intraocular lens power in Indian eyes

Paritekar, Prajakta; Nayak, Akshay; Umesh, Y; Sirivella, Indrani; Manoharan, Sharanya; Khatib, Zain

doi:10.4103/ijo.ijo_2014_21

Cited by 8 publications

(8 citation statements)

References 15 publications

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“…However, they did not compare all the other formulas. Our results were different from those of Paritekar et al, [ 29 ] who found SRK/T and BU II to have lower MedAE and MAE than Kane formula for myopic eyes. This could be because they compared only 59 eyes in the myopic group (which they defined as AL >24 mm) and compared data at the end of 1 week instead of 1 month postoperatively.…”

Section: Discussioncontrasting

confidence: 99%

Retrospective assessment of accuracy of nine intraocular lens power calculation formulae in eyes with axial myopia

Shetty,

Nuijts

et al. 2024

Indian Journal of Ophthalmology

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Purpose: To compare the accuracy of nine conventional and newer-generation formulae in calculating intraocular lens power in eyes with axial myopia. Setting: Tertiary eye care center, Bengaluru, India. Design: Retrospective cross-sectional, comparative study conducted in India. Methods: Patients undergoing uneventful phacoemulsification in eyes with axial length >26 mm were included. Preoperative biometry was done using Lenstar LS 900 (Haag-Streit AG, Switzerland). Single eye of patients undergoing bilateral implantation was randomly selected. Optimized lens constants were used to calculate the predicted postoperative refraction of each formula, which was then compared with the actual refractive outcomes to give the prediction errors, following which subgroup analysis was performed. The Kane formula, Barrett universal II, Emmetropia Verifying Optical (EVO) 2.0, Hill Radial Basis Function (Hill RBF) 3.0, Olsen formula, along with Wang Koch–adjusted four formulae, that is, Sanders Retzlaff Kraff/Theoretical (SRK/T), Holladay 1, Haigis, and Hoffer Q formula, were compared for intraocular lens power calculations. Results: One hundred and sixty-five eyes that fulfilled all the inclusion criteria were studied. Hill RBF 3.0 had the lowest mean and median absolute prediction errors (0.355 and 0.275, respectively) compared to all formulas. In subgroup analysis (26–28, >28–30, and >30 mm), significant difference was seen only in extremely long eyes (>30 mm). The Hill RBF 3.0 formula generated the maximum percentage of eyes with refractive errors within ±0.25, ±0.5, ±0.75, and ±1 D (46%, 76.2%, 89.9%, and 95.8%, respectively). Conclusion: This is the first study evaluating all the formulas exclusively in the myopic eyes. Hill RBF 3 was found to be superior in accuracy to all other formulas.

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Section: Discussioncontrasting

confidence: 99%

Retrospective assessment of accuracy of nine intraocular lens power calculation formulae in eyes with axial myopia

Shetty,

Nuijts

et al. 2024

Indian Journal of Ophthalmology

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“…Our findings suggest that there were modest differences between the formulas tested, with refractive prediction errors of approximately 0.32 D on the myopic side with the Hoffer Q, Kane, SRK/T, and Holladay 1 formulas. Similar findings were reported by Paritekar et al ( 17 ) in their study. Thus, the recommended lens constant for the Tecnis IOL should be altered for optimization.…”

Section: Discussionsupporting

confidence: 93%

“…The Kane (MAE 0.441 D) formula was the most accurate predictor of postoperative refractions in their study. However, research by Paritekar et al ( 17 ) on Indian populations demonstrated that the Kane formula did not exhibit significant advantages in short AL eyes, which was consistent with our findings. In our study, the Kane formula also did not show clear advantages in short eyes.…”

Section: Discussionsupporting

confidence: 92%

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Accuracy of new intraocular lens calculation formulas in Chinese eyes with short axial lengths

Ma,

Lin,

et al. 2023

Front. Med.

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PurposeTo compare the measurement accuracy of new/updated intraocular lens (IOL) power calculation methods, namely, Kane, Emmetropia Verifying Optical (EVO), with existing methods (Barrett Universal II, Olsen, Haigis, Hoffer Q, Holladay 1, SRK/T) in Chinese eyes with axial lengths ≤ 22.5 mm.MethodsThe study included data from patients who underwent uneventful cataract surgery with the insertion of ZCB00 IOL. Refractive prediction errors were determined by calculating the difference between postoperative refraction and the predicted refraction using each formula. Various parameters were evaluated, including mean prediction error (ME), mean absolute error (MAE), median absolute error (MedAE), and the percentage of eyes with prediction errors (PE) within different ranges.ResultsThe study enrolled 38 eyes of 38 patients, and the Barrett Universal II formula demonstrated the lowest MAE and MedAE among the tested formulas. Post hoc analysis using Wilcoxon signed-rank pairwise comparisons for non-parametric samples with Bonferroni correction revealed no significant difference in postoperative refractive prediction among all the formulas (P > 0.05). The percentage of eyes with PE within ± 0.5 D was as follows: Barrett Universal II, 81.58%; Haigis, 78.95%; EVO, 76.32%; Olsen, 76.32%; Holladay I, 73.68%; SRK/T, 71.05%; Kane, 68.42%; and Hoffer Q, 65.79%.ConclusionThe Barrett Universal II formula was more accurate than the other formulas for Chinese eyes with AL ≤ 22.5 mm.

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“…Eyeballs are a cystic structure and almost spherical in shape [ 1 ]. The anterior and posterior diameter (axial length (AL)) is usually about 22-24 mm in the emmetropic eye [ 2 ]. The parallel rays of light from any image that enters the eye are focused on the retina by the refractive properties of the cornea and lens [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

A Study Linking Axial Length, Corneal Curvature, and Eye Axis With Demographic Characteristics in the Emmetropic Eyes of Bangladeshi People

Benzir¹,

Afroze²,

Zahan³

et al. 2022

Cureus

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BackgroundAxial length (AL) and corneal curvature (CC) are one of the furthest critical parameters for optometry and oculoplastic surgery. These two variables are crucial in biometry for accurately measuring the power of the intraocular lens in cataract surgery. This research aimed to determine the association linking axial length and corneal curvature with demographic characteristics in emmetropic eyes of Bangladeshi people. MethodsThis descriptive cross-sectional research was carried out among 200 emmetropic eyes of Bangladeshi people attending the Department of Ophthalmology at Rajshahi Medical College, Bangladesh, with different eye conditions, between July 2017 and June 2018. Data was gathered by conducting person-to-person interviews, checking visual activity using the Snellen chart, and measuring corneal curvature using an autokeratometer and axial eyeball length using A-scan ultrasonography. ResultsA total of 200 attendances were studied, 90 males and 110 females. All were emmetropic. The age range was 21-52 years, and the highest contributors were in the 21-30-year age group. The association between right axial length and right corneal curvature shows a negative relation among both sexes. It was -0.61 (βcoefficient (β-coff)), and highly significant in females at -0.89 (β-coff). Additionally, the association between left axial length and left corneal curvature shows a negative relation of -0.65 (β-coff), which was again highly significant in females at -0.87 (β-coff). Both were not significant in males. There was no significant association linking axial length and eye axis in both sexes. The multivariate regression model was used to assess the p-value, and the regression model was adjusted by age. ConclusionOptical parametric measurement is a noninvasive diagnostic and assessment tool that might help in the actual measurement of intraocular lens implantation in cataract surgery and may also provide supplementary information to the researcher domain.

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Comparison of newer Kane formula with Sanders Retzlaff Kraff/Theoretical and Barrett Universal II for calculation of intraocular lens power in Indian eyes

Cited by 8 publications

References 15 publications

Retrospective assessment of accuracy of nine intraocular lens power calculation formulae in eyes with axial myopia

Retrospective assessment of accuracy of nine intraocular lens power calculation formulae in eyes with axial myopia

Accuracy of new intraocular lens calculation formulas in Chinese eyes with short axial lengths

A Study Linking Axial Length, Corneal Curvature, and Eye Axis With Demographic Characteristics in the Emmetropic Eyes of Bangladeshi People

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