Three-year experience of posterior chamber phakic intraocular lens implantation in the high myopia correction

Aim: to evaluate the efficacy and safety of posterior chamber phakic intraocular lens (pIOL) implantation for the high myopia correction. Patients and Methods: 37 patients (55 eyes) aged 20 to 43 years were included in the study. All patients underwent the following ophthalmic examinations before surgery: visometry, autorefractometry, biometry, tonometry, optical coherence tomography, evaluation of corneal endothelial cell density, peripheral retinal exam using a Goldmann lens. pIOL power calculation was conducted using a modified vergence formula. All surgeries were performed by one surgeon according to the standard procedure. Patients were examined after surgery after 1 day, 1 month, 3 months, then every 6 months for 3 years. Visometry was performed 1 day and 1 month after the surgery. During subsequent visits, all of the listed examinations were performed, except for peripheral retinal exam using a Goldmann lens. Results: all patients completed the study. There were no intraoperative complications. No cases of cataracts or other postoperative complications were observed during 3-year follow-up. Uncorrected visual acuity 3 years after surgery was 18.4% higher than the maximum corrected visual acuity before surgery, and target refraction was observed in 86% of the eyes. Intraocular pressure during 3-year follow-up was within the normal range and averaged 17.04 mmHg. Fluctuations in the lens vault from the pIOL posterior surface to the anterior surface of the lens (VAULT) were within the normal range. Corneal endothelial cell density decreased by an average of 0.09% 3 years after surger During 3-year follow-up, there were no clinically significant changes in the anterior chamber depth of the eye. The average change in the axis orientation was also <6° for all visit intervals. At the same time, the patients did not notice a change in the pIOL orientation up to 10°. Conclusion: pIOL implantation is a safe and effective method for high myopia surgical correction. Keywords: myopia, myopia correction, implantation, phakic intraocular lens, VAULT, endothelial cell density, anterior chamber of the eye. For citation: Saliev I.F., Yusupov A.F., Mukhamedova N.I. Three-year experience of posterior chamber phakic intraocular lens implantation in the high myopia correction. Russian Journal of Clinical Ophthalmology. 2022;22(3):156–160 (in Russ.). DOI: 10.32364/2311-7729- 2022-22-3-156-160.