Исследование частоты встречаемости клинически тонкой роговицы у пациентов с миопией средней и высокой степени, обратившихся для выполнения кераторефракционной операции

Abstract

Purpose. To assess frequency of occurrence patients with insufficient thickness of optical zone of cornea for complete elimination of myopic refraction using FemtoLASIK technology. Material and methods. By random sampling, 100 patients (200 eyes) were selected with varying degrees of myopia who planned refractive surgery using the FemtoLASIK or Smile technology. The selection criterion was presence the prognosis of residual myopia in eyes due to the inability to fulfill the required ablation depth of the optical zone. The share of such patients in the total population of selected patients, their gender, age, magnitude of residual myopic refraction were found out. Results. According to results of the study in 88 patients (176 eyes, 88 %) thickness of optical zone of cornea made it possible to completely eliminate the existing myopic refraction) using the FemtoLASIK or Smile technology. In 12 patients (24 eyes, 12 %) thickness of optical zone of cornea did not made it possible to completely eliminate myopic refraction, without critical thinning of the stromal bed of cornea. The predicted residual myopia in these eyes ranged from –1.0 to –2.5 diopters. Photorefractive keratectomy technology was offered to these patients, which was agreed by 8 patients (16 eyes). Conclusion. The obtained data revealed the high relevance of the development of femtolaser refractive surgery technology, which provides for the complete elimination of myopic refraction in such patients by reducing the thickness of the corneal surface valve and, accordingly, increasing the thickness of the stromal bed. Keywords: refractive surgery, residual myopia, ablation depth, FemtoLASIK, corneal surface valve, residual stromal bed thickness.