Results of an experimental and clinical study of a new hydrophobic intraocular lens for correction of aphakia and corneal astigmatism

• Main Authors: M. B. Sviridova, A. G. Grinev, O. M. Zherebtsova, E. V. Kalinina, N. A. Sobyanin, V. P. Bachurikhin
• Format: Article
• Language: Russian
• Published: Publishing house "Ophthalmology" 2020-10-01
• Series: Офтальмохирургия
• Subjects: hydrophobic intraocular lens; envista; envista toric; electron scanning microscopy; clinical study
• Online Access: https://www.ophthalmosurgery.ru/jour/article/view/651

Purpose. Experimental and clinical study of hydrophobic intraocular lenses (IOL) enVista and enVista Toric for the correction of aphakia and corneal astigmatism.Material and methods. In the experimental part, enVista and enVista Toric IOLs (manufactured by Baush&Lomb, USA) were studied by electron scanning microscopy. The clinical part of the study included the results of implantation of 100 IOL enVista in patients with cataract and corneal astigmatism up to 1.25 diopters and 20 IOL enVista Toric in patients with cataract and corneal astigmatism 1.25 diopters or higher.Results. According to the results of electron microscopy, no «defects» were found on the surface and optical edge of the lenses. The optical edge of the lens has a rectangular shape throughout 360°. The deviation of the shape of the optical edge of the IOL from the ideal square edge area was 71.53–164.48 um² and 99.05–338.61 um², respectively, at radii of 40 um and 60 um. High uveal biocompatibility was confirmed by the absence of cellular deposits on the surface of all 120 IOLs. The lens material was not biodegraded, and there was no glistening effect in all cases. The percentage of opacity of the posterior lens capsule due to migration of epithelial cells of the lens was 5.0% in the three-six millimeter zone without indications for laser capsulotomy. After implantation of the envista Toric IOL, the average value of astigmatism decreased from 1.77±0.38 to 0.42±0.11 diopters (p<0.05). The rotational stability of the IOL position remained within the range of 2.50±0.11° during one year of observation. In both groups, visual acuity significantly improved after surgery (p<0.05), the change in refraction of the target during the year was observed slightly in the direction of myopia, but there were no significant differences.Conclusion. EnVista and enVista Toric IOL implantation provide high visual acuity in patients with age-related cataracts and cataracts in combination with corneal astigmatism, stable refractive indices.