Abstract
Purpose :
To compare twelve intraocular lens power calculation formulas for eyes smaller than 22.0 mm in terms of absolute error, the percentage of postoperative emmetropia and agreement interval in Bland-Altman analysis
Methods :
The data of hyperopic patients who underwent uneventful phacoemulsification between February 2016 and March 2022 were reviewed. Intraocular lens power was calculated using Holladay1, SRK/T, Hoffer Q, Holladay 2, Haigis, Barrett Universal II, Hill-RBF, Ladas, Kane, EVO, Pearl-DGS and K6 formulas. Three months after phacoemulsification, refraction was measured, and mean absolute error was calculated. Percentage of patients with full visual acuity 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 ranged between 20.02 mm and 21.98 mm, were included. The Kane formula achieved the lowest mean absolute error 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). Additionally, with the Kane formula percentage of patients with full visual acuity 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)
Conclusions :
The Kane formula is recommended for intraocular lens power calculation for eyeballs with the axial length smaller than 22.0 mm. The EVO formula gives very promising results in regarding the accuracy of intraocular lens power for hyperopic eyes
This abstract was presented at the 2023 ARVO Annual Meeting, held in New Orleans, LA, April 23-27, 2023.