New avenues of preoperative evaluation before corneal refractive surgery during the COVID-19 pandemic
Authors:   Krasnodar Branch of the S.N. Fedorov NMRC “MNTK “Eye Microsurgery”, Krasnodar, Russian Federation, Sakhnov S.N. , Klokova O.A. ,   Krasnodar Branch of the S.N. Fedorov NMRC “MNTK “Eye Microsurgery”, Krasnodar, Russian Federation, Piskunov A.V. ,   Krasnodar Branch of the S.N. Fedorov NMRC “MNTK “Eye Microsurgery”, Krasnodar, Russian Federation, Damashauskas R.O. ,   Krasnodar Branch of the S.N. Fedorov NMRC “MNTK “Eye Microsurgery”, Krasnodar, Russian Federation, Geidenrich M.S. ,   Krasnodar Branch of the S.N. Fedorov NMRC “MNTK “Eye Microsurgery”, Krasnodar, Russian Federation, Dyakonova E.I. ,   Krasnodar Branch of the S.N. Fedorov NMRC “MNTK “Eye Microsurgery”, Krasnodar, Russian Federation
Published: May 2021

Aim: to assess the reproducibility and comparability of measurements produced by Visionix VX130+ and their consistency with data produced by Topcon KR-800, NT-530P, Oculyzer, and RTVue-100. Patients and Methods: 124 patients (248 eyes) aged 18–45 years (mean age 25.24±7.5 years) were enrolled. Refractometry, IOP levels, and pachymetry measured by Visionix VX130+ system (LLC “Visionix Rus” — affiliated company of Luneau Technology Operations) were compared to the readings produced by Topcon KR-800 Auto Kerato-Refractometer (Topcon, Japan), Nidek NT-530P non-contact tonometer (Nidek, Japan), CT200 Goldman applanation tonometer (Reichert, USA), ALLEGRO Oculyzer (WaveLight AG, Germany), and RTVue-100 (Optovue, USA). Results: refractometry produced by Visionix VX130+ is highly reproducible and stable. Mean spread of spherical equivalent was 0.22±0.22 D and mean spread of cylindrical equivalent was 0.23±0.16 D. No significant differences were revealed between refractometry readings produced by Visionix VX130+ and Topcon KR-800 in patients with myopia (p>0.05). Both Visionix VX130+ and Nidek NT-530P (automated IOP measurements) produce two values, i.e., with and without corneal thickness. Our findings suggest that mean values are virtually similar in Visionix VX130+ group (p>0.05) while Nidek NT-530P produces significant differences (p<0.05). Mean central corneal thickness (CCT) measured by Visionix VX130+ was almost similar to CCT measured by Oculyzer (the difference was 3.8±2.23 μm, р>0.05) and greater than CCT measured by RTVue-100 (р<0.05). Conclusion: clinical trials comparing the readings produced by Visionix VX 130+ and other devices whose reliability was evidenced by long-term clinical experience have demonstrated that Visionix VX 130+ multifunctional diagnostic system is fully in line with the COVID-19 pandemic requirements. This device provides the measurements for performing safe and effective corneal refractive surgery for refractive errors. Keywords: corneal refractive procedure, pneumotonometry, aberrometry, corneal topography, pachymetry, cornea, intraocular pressure. For citation: Sakhnov S.N., Klokova O.A., Piskunov A.V. et al. New avenues of preoperative evaluation before corneal refractive surgery during the COVID-19 pandemic. Russian Journal of Clinical Ophthalmology. 2021;21(2):72–77. DOI: 10.32364/2311-7729-2021-21-2-72-77.