FEMTOSECOND LASER REFRACTIVE AUTOKERATOPLASTY - A PERSONALIZED APPROACH

Objective: is to develop an algorithm for calculating the parameters of femtoresection of the cornea when performing femtosecond laser refractive autokeratoplasty using personalized mathematical models. Materials and methods. 15 male patients with the diagnosis of keratoconus of the 3rd degree were operated. The average age was 34 ± 6 years. Patients did not notice a decrease in vision for 5-6 years. Mathematical model for calculating the parameters of femtosecond laser refractive autokeratoplasty was developed by us together with the Kaluga branch of the Bauman MSTU. Together with the engineering service of Ziemer Ophthalmic Systems (Switzerland) a specialized software was created that allows to perform two consecutive circular corneal cuts with the specified parameters within the framework of one procedure using femtosecond laser «Femto LDV Z8». Results of the study. In all cases, corneal resection was performed using individual parameters according to the calculations. The keratometry parameters were recorded at the level of 32 ± 4 diopters 1 week after surgery. The depth of the anterior chamber of the eye at this period decreased from 3.59 ± 0.2 to 2.45 ± 0,31 mm. 1 month after the surgery an average keratometry increased to 35 ± 6 diopters. The depth of the anterior chamber had a tendency to restore up to 2.8 ± 0.25 mm. 6 months after the operation the average keratometry was at 41 ± 3 diopters. The depth of the anterior chamber was 3.4 ± 0.1 mm. Indicators of astigmatism 6 months after the surgery was 3.5 ± 1.5 d as compared with initial values of 7 ± 2 diopters. Conclusion. Further studies and larger clinical experience are needed to obtain objective data about the efficacy and stability of refractive results of femtosecond laser autokeraplasty (bibliography: 7 refs).

femtosecond laser refractive autokeratoplasty, keratoconus, mathematical model