Особенности расчета оптической силы недифракционной интраокулярной линзы с расширенной глубиной фокуса

Abstract

Purpose. Retrospective analysis of the accuracy of 7 formulas for calculating the optical power of a non-diffractive intraocular lens (IOL) with extended depth of focus. Material and methods. The retrospective study included 48 patients (81 eyes) with AcrySof IQ Vivity EDOF IOL implantation. The IOL optical power range was +15.0 to +30.0 D, and the target refraction was –0.25 to 0.25 D. The mean age of the patients was 59.1±7.7 (40–84) years.The SRK/T, Barrett Universal II, Haigis, Hoffer Q, Holladay 2, Olsen, and Kane formulas were retrospectively analyzed for effectiveness using appropriate constants. Each formula was optimized for the study group of patients to achieve an average refractive error as close to zero as possible. For each formula, the mean error (ME), mean absolute error (MAE), standard deviation (SD), median absolute error (MedAE), maximum absolute error (MaxAE), and percentage of eyes within the error range of 0.25, 0.5, 1.0, and 2.0 D were calculated. Results. The optimized constants were LF = 2.18, a0 = 1.39, a1 = 0.41, a2 = 0.13, personalized ACD = 5.74, ACD (Hoffer Q/Holladay 2) = 5.64/5.50, A-constant (SRK/T/Kane) = 119.2/119.3. The lowest MAE is determined for Kane, Barrett Universal II, and SRK/T formulas (p<0.05). The use of Haigis and Olsen formulas was characterized by a lower MAE compared to Holladay 2 and Hoffer Q formulas (p<0.05). With the exception of the Haigis and Hoffer Q formulas, all other formulas are shown to fall within the target refraction of ±2.00 D. With the Kane, Barrett Universal II and SRK/T formulas, 100% target refraction of ±1.00 D, 98‒99% target refraction of ±0.50 D, and greater than 80% target refraction of ±0.20 D were determined. Conclusion. In this study, we retrospectively evaluated the performance of seven formulas for calculating the optical power of the Acrysof IQ Vivity EDOF non-diffractive intraocular lens. The best results were shown for the Kane, Barrett Universal II and SRK/T formulas. Key words:cataract, phacoemulsification, EDOF, Symfony, IOL optical power calculation, constant optimization