Accuracy of the refractive prediction determined by intraocular lens power calculation formulas in high myopia

Abstract

Purpose: Our study was conducted to evaluate and compare the accuracy of the refractive prediction determined by the calculation formulas for different intraocular lens (IOL) powers for high myopia. Methods: This study reviewed 217 eyes from 135 patients who had received cataract aspiration treatment and IOL implantation. The refractive mean numerical error (MNE) and mean absolute error (MAE) of the IOL power calculation formulas (SRK/T, Haigis, Holladay, Hoffer Q, and Barrett Universal II) were examined and compared. The MNE and MAE at different axial lengths (AL) were compared, and the percentage of every refractive error absolute value for each formula was calculated at ±0.25D, ±0.50D, ±1.00D, and ±2.00D. Results: In all, 98 patients were recruited into this study and 98 eyes of them were analyzed. We found that Barrett Universal II formula had the lowest MNE and MAE, SRK/T and Haigis formulas arrived at similar MNE and MAE, and the MNE and MAE calculated by Holladay and Hoffer Q formula were the highest. Barrett Universal II formulas have the lowest MAE among different AL patients, whereas it reached the highest percentage of refractive error absolute value within 0.5D in this study. The MAE of each formula is positively correlated with AL. Conclusion: Barrett Universal II formula rendered the lowest predictive error compared with SRK/T, Haigis, Holladay, and Hoffer Q formulas. Thus, Barrett Universal II formula may be regarded as a more reliable formula for high myopia.

Accuracy of Six Intraocular Lens Power Calculations in Eyes with Axial Lengths Greater than 28.0 mm

“…Asians have a higher percentage of high myopia as compared with Caucasians [ 16 , 17 ]. As a result, most studies assessing IOL calculation accuracy within high AL have been performed in predominantly Asian study populations [ 14 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. While our study did not have ethnicity data readily available in the paper charts, the population demographics of the study site (Draper, UT) are 91.1% white and 3.5% Asian (US Census Data for Draper, UT, available at , accessed 27 June 2021).…”

Wang Koch-adjusted axial length in SRK/T formula for ocular biometry in high myopia: a prospective study

“…Among all the currently available formulas in high myopia, the benchmark is represented by the Barrett Universal II formula, which according to the literature provides the lowest average postoperative refractive error (-0.09D ± 0.42D to +0.05D ± 0.46D) and the best percentage of a postoperative refraction of ± 0.5D (77%) [8][9][10][11]. We consider that the results obtained in our series using adjustment of the axial length according to the Wang Koch method are close to the performance of the Barrett Universal II formula, which is rather modern and sophisticated but which requires technology not yet available for routine practice in developing countries.…”

Correlating Kane formula with existing intraocular lens formulae for corneal curvatures and axial lengths

“…Many of the recent studies have reported that Barrett Universal II formula has the lowest absolute error (AE) compared with other modern formulae. [ 1 2 3 4 5 ]…”