Saratov JOURNAL of Medical and Scientific Research

Ophthalmological clinics «Eximer»

Analysis of six formulas for intraocular lens optic power calculation precision in eyes with axial length of 20-22 mm

Year: 2020, volume 16 Issue: №2 Pages: 638-642
Heading: Ophtalmology Article type: Original article
Authors: Pershin K.B., Pashinova N.F., Likh I.A., Tsygankov A.Yu.
Organization: Ophthalmological clinics «Eximer»

The purpose of the study was to conduct comparative analysis of the accuracy of IOL optical power calculation for eyes with an axial length of 20-22 mm and 22-24 mm. Material and Methods. 147 eyes of 104 patients were included in the study. The study group (I) included 56 patients (81 eyes) with short eyes (average axial eye length 21.17±0.56 (20.02-21.98 mm). Comparison group (II) consisted of 48 patients (66 eyes) with a normal axial length of 22.75±0.46 (22.0-23.77) mm. The IOL optical power was calculated using the SRK/T formula, and the retrospective comparison was made using the Hoffer-Q, Holladay 2, Olsen, Haigis and Barrett Universal I formulas. Results. Group I was characterized by statistically insignificant (p<0.05) differences in the average estimation error for Holladay 2, Hoffer-Q, SRK/T, Olsen and Barrett Universal II formulas (0.19±0.14, 0.23±0.08, 0.15±0.09, 0.21±0.13 and 0.17±0.21 D respectively). When using the Haigis formula, the smallest average estimation error was obtained (0.11±0.02), the differences are significant at the trend level (0.05

2020_02-1_638-642.pdf418.33 KB

Clinical and functional results of bifocal and trifocal intraocular lenses implantation: a comparative analysis

Year: 2019, volume 15 Issue: №2 Pages: 518-524
Heading: Ophtalmology Article type: Original article
Authors: Pershin K.B., Pashinova N.F., Konovalova M.M., Tsygankov A.Yu., Konovalov M.E.
Organization: Konovalov Eye Center, Ophthalmological clinics «Eximer»

Purpose: comparative analysis of the results of implantation of bifocal refractive-difractive IOLs and new trifocal single-piece aspherical difractive IOLs. Material and Methods. A prospective open study included 193 patients (291 eyes) with presbyopia. The average age of patients was 58.4±11.3 years. Group I consisted of 71 patients (108 eyes) with implantation of the AcrySof PanOptix trifocal IOL; Group II — 122 patients (183 eyes) with the AcriSof Restor bifocal IOL with addidation 3 Dioptr. Results. After 6 months of follow-up in group I, an increase in UCNVA from 0.2±0.09 to 0.85±0.17, an UCFVA from 0.2±0.07 to 0.78±0.13, and a UCIVA from 0.3±0.1 to 0.84±0.2, BCNVA from 0.58±0.24 to 0.98±0.21, BCFVA from 0.68±0.26 to 1±0.1 and BCIVA with 0.59±0.28 to 0.95±0.18 (p<0.05 in all cases). In group II, signifcantly lower values of UCNVA (0.62±0.09), UCIVA (0.31±0.14) and BCIVA (0.6±0.19) were observed when compared with group I (p<0.05). In all groups, a decrease in the spherical and cylindrical component of refraction was observed. Level of contrast sensitivity after implantation of the AcrySof Restor was higher for all frequencies. According to the results of the survey on a scale of VF-14 in group I, the average value was 97.9±1.2 points, and in group II — 80.1±6.4 (p<0.05). Conclusion. In this paper an advantage of a new trifocal IOL for vision correction at an average distance under various lighting conditions is shown, as well as the best indicators of vision quality on the VF-14 scale.

2019_02-1_518-524.pdf865.31 KB