SUMMARY
Purpose of the study. To evaluate the efficiency of Femto-LASIK (femtosecond laser in situ keratomileusis), LASIK (laser in situ keratomileusis), and PRK (photorefractive keratectomy) and to compare the changes in topometric indices of the cornea. Materials and methods. The materials of 54 patients (108 eyes) were studied, of whom 34 were treated by the Femto-LASIK method, and 10 each by the LASIK and PRK methods. Visual acuity and topometric characteristics of the cornea were studied in all patients preoperatively and 3 months after surgery. Results. The uncorrected visual acuity before surgery was similar in all patients; after surgery, the improvement in uncorrected vision was more than 10-fold. The efficiency was comparatively higher with Femto-LASIK. The change in topometric indices in all groups had a similar direction, and only in PRK did it correlate with visual acuity. Conclusions. The uncorrected visual acuity in patients after Femto-LASIK, LASIK, and PRK surgery was similar (0.83±0.02, 0.86±0.04, and 0.8±0.02, respectively). In all patients, the topometric index IVA (index of vertical asymmetry) had a strong correlation with IHA (index of height asymmetry) and IHD (index of height decentration).
Keywords: laser correction, myopia, topometric index, cornea

---

REFERENCES

1. Барабанова, Л.С., Каменских, Т.Г., Белоусова, Т.В., Гилева, Е.В. Эффективность современных методик лазерной рефракционной хирургии на основании опыта клиники глазных болезней СГМУ // Саратовский научно-медицинский журнал, - 2017; 13 (2), - c. 334-338.
2. Гланц С. Медико-биологическая статистика. Москва. Изд. Практика. 1999 г., 459 с.
3. Копаенко, А.И. Эффективность экзимер-лазерной коррекции зрения у пациентов с миопией высокой степени // Таврический медико-биологический вестник, - 2016, 1, - c. 51-54.
4. Эль-Айди, Н.М., Пахомов, М.А., Морозов, А.М. Эффективность лазерной коррекции зрения у пациентов возрастной категории 40-43 года с миопией различных степеней, методом персонализированный Lasik // Forcipe, - 2020,Tом 3 Спецвыпуск, - c. 639-640.
5. Castro-Luna, G,. Jiménez-Rodríguez, D., Pérez-Rueda, A., Alaskar-Alani, H. Long Term Follow-Up Safety and Effectiveness of Myopia Refractive Surgery // Int J Environ Res Public Health. 2020. №24;17(23). - p.8729.
6. Gao, H., Miles, T.P., Troche. R., Murdoch, D.M., Koefoed, V.F., Cason, J.B. Quality of vision following LASIK and PRK-MMC for treatment of myopia // Mil Med. - 2022 Aug 25, 187(9-10):e1051-e1058.
7. Janiszewska-Bil, D., Czarnota-Nowakowska, B., Grabarek, B.O., Dobrowolski, D. et. all. Comparison of vision correction and corneal thickness at 180-day follow-up after Femtosecond Laser-Assisted In-Situ Keratomileusis (FS-LASIK), Photorefractive Keratectomy (PRK), and Small Incision Lenticule Extraction (SMILE): a study from a single center in Poland of 120 patients with myopia // Med Sci Monit. - 2023 Feb, 16; 29: e939099.
8. Kulikova, I.L., Pozdeyeva, N.A., Terentieva, A.E., Sinitsyn, M.V. Long-term clinical and functional outcomes of high myopia correction by femtosecond laser-assisted implantation of an intrastromal ring // Vestn. Oftalmol. - 2022, 138(4), - p.74-80.
9. Liu, X., Schallhorn, S.C., Hannan, S.J., Teenan, D., Schallhorn, J.M. Three-Month Outcomes of Laser Vision Correction for Myopia and Hyperopia in Adults With Amblyopia // J Refract Surg. 2020, №1;36(8). - p. 511-519. doi: 10.3928/1081597X-20200612-02. PMID: 32785724
10. Piyacomn, Y., Kasetsuwan, N., Puangsricharern, V., Reinprayoon, U. et.all. Topometric indices and corneal densitometry change after corneal refractive surgery combined with simultaneous collagen crosslinking // Clin Ophthalmol. - 2019 Sep., 27(13), - p.1927-1933.
11. Rahmania, N., Salah, I., Rampat, R., Gatinel, D. Clinical Effectiveness of Laser-Induced Increased Depth of Field for the Simultaneous Correction of Hyperopia and Presbyopia // J Refract Surg. - 2021 № 1, 37(1). - p.16-24.
12. Řeháková, T., Veliká. V., Jirásková. N. Correction of myopia and myopic astigmatism by femtosecond laser in situ keratomileusis // Cesk Slov Oftalmol. - 2019 Summer, 75(2). - p.65-71.
13. Saad, A., Saad, A., Frings, A. Refractive results of photorefractive keratectomy comparing trans-PRK and PTK-PRK for correction of myopia and myopic astigmatism // Int Ophthalmol. - 2024 Feb 25, 44(1), - p.111.
14. Wen, D., McAlinden, C., Flitcroft, I. et. all. Postoperative efficacy, predictability, safety, and visual quality of laser corneal refractive surgery: a network meta-analysis // Am J Ophthalmol. - 2017 Jun; 178, - p. 65-78.
15. Yu, E.J., Nejad, M., Miller, K.M. Outcomes of resident-performed FS-LASIK for myopia and myopic astigmatism // J Refract Surg. - 2021 Aug;37(8), - p. 545-551.
16. Zhang, Y., Li, T., Li, Z., Dai, M., Wang. Q., Xu. C. Clinical outcomes of single-step transepithelial photorefractive keratectomy and off-flap epipolis-laser in situ keratomileusis in moderate to high myopia: 12-month follow-up // BMC Ophthalmol. - 2022 May 23. 22(1):234.
17. Zhou, C., Li, Y., Wang, Y., Fan, Q., Dai, L. Comparison of visual quality after SMILE correction of low-to-moderate myopia in different optical zones // Int Ophthalmol. - 2023 Oct, 43(10), - p. 3623-3632.