A-constants Optimization for Intraocular Lenses on the Clareon® platform

Purpose. To optimize a-constants for intraocular lenses (IOL) on the Clareon® (Alcon, USA) platform. Material and methods. The study included 206 patients (206 eyes) divided into 4 groups depending on IOL implanted model: the 1 st — SY60WF ( n = 71); the 2 nd — Clareon Toric CNW0T2-9 ( n = 76); the 3 rd — Clareon PanOptix CNWTT0-Т6 ( n = 32); the 4 th — Clareon Vivity CNWET0-Т6 ( n = 27). Optical biometry was performed by IOL-Master 700 (Carl Zeiss, Germany). For toric IOL calculation keratotopography by CASIA Corneal/Anterior Segment OCT SS-1000 (Tomey, Japan) was performed. A month after phacoemulsification spherical equivalent of refraction was evaluated. Mean IOL calculation error (ME) was used to calculation accuracy assessment. A-constant optimization performed by ME zeroing. Results. ME was 0.32 ± 0.42 D for Clareon SY60WF, 0.31 ± 0.36 D for Clareon Toric CNW0T2-9, 0.38 ± 0.34 D for Clareon PanOptix CNWTT0-Т6 and 0.10 ± 0.34 D for Clareon Vivity CNWET0-Т6. ME zeroing allows to define real a-constants for IOLs: 119.38 for Clareon SY60WF, 119.46 for Clareon Toric CNW0T2-9, 119.54 for Clareon PanOptix CNWTT0-Т6 and 119.30 for Clareon Vivity CNWET0-Т6. Conclusion. Using of proposed a-constants for IOLs on Clareon® platform could help with target refraction achievement and to avoid a hyperopic refraction shift.