Офтальмохирургия (Jul 2018)
IMPLANTATION OF BIFOCAL OPTICAL SYSTEM. PRELIMINARY RESULTS
Abstract
Purpose. Analysis of the clinical results in implantation of the bifocal optic system (BIOS).Material and methods. There was developed the BIOS, consisting of two intraocular volume-substituting lenses (open bag device) with a plane torsion haptic (PTHIOL) made of hydrophobic acrylic. The BIOS consists of a basic PTHIOL providing the correction for the far distance, and of an additional PTHIOL providing the correction for near distance with a central small aperture hole. Both PTHIOLs are located in the capsular bag (CB) perpendicularly to each other, without contacting each other. In 8 patients (9 eyes) the PHACO (capsulorrexis 5.0-6.0mm, 2.2mm incision) was performed with the endocapsular implantation of BIOS. The follow-up was from 8 months to 2.25 years. The postoperative examination included a determination of uncorrected visual acuity for distance (UCVAD) and uncorrected visual acuity for near (UCVAN), as well as the BIOS position in the CB using ultrasonic biomicroscopy (UBM) after 1-3-6-12-24 months.Results. All operations were carried out without complications. The UCVAD at discharge was 0.7 to 1.0, mean 0.87±0.12. The UCVAN allowed not to use glasses in all cases. The IOP was at average 19.7±2.42mmHg. The target refraction ±0.5D was achieved in all cases. According to the UBM data, the implants were in the correct position in the CB. No CB fibrosis, folds and opacification of the posterior capsule were noted. In one case, there was an episodic appearance of a light halo.Conclusion. The results of the BIOS implantation showed its safety. The efficiency of the BIOS was confirmed to ensure a simultaneous correction of aphakia both for the far and near distance, as well as the maintenance of the CB form and prevention of its fibrosis. The open CB and the absence of contact between the IOLs allow the one-stage or delayed additional correction of pseudophakic presbyopia or refractive error.
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