Development of method for measuring a light energy distribution over foci for mould of diffractive component of bifocal intraocular lens

2021 ◽  
Author(s):  
Victor P. Korolkov ◽  
Polina Konoshenko ◽  
Sergey L. Mikerin ◽  
Dmitrij A. Belousov ◽  
Anatoly I. Malyshev ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Intraocular Lens ◽  
Light Energy ◽  
Bifocal Intraocular Lens

scholarly journals APPLICATION OF MICRORELIEF PLANARIZATION BY PHOTORESIST FOR CHARACTERIZATION OF DIFFRACTIVE ORIGINALS AT PRODUCTION OF BIFOCAL INTRAOCULAR LENS «MIOL-ACCORD»

2021 ◽  
Vol 8 ◽  
pp. 17-24
Author(s):  
Viktor P. Korolkov ◽  
Polina Y. Konoshenko ◽  
Sergey L. Mikerin
Keyword(s):  
Refractive Index ◽  
Energy Distribution ◽  
Intraocular Lens ◽  
Vitreous Body ◽  
Light Energy ◽  
Frontal Polymerization ◽  
Intraocular Lenses ◽  
Visible Range ◽  
The Matrix ◽  
Drying Conditions

Bifocal diffraction-refractive intraocular lenses (BDRIOL) are widely used in ophthalmology for replacing natural lenses that have been clouded by cataracts. In Russia, the REPER-NN company has developed a manufacturing technology for such BDRIOLS which based on the frontal polymerization of a liquid photopolymer placed between two transparent quartz matrices. The direct measurement of the light energy distribution over the foci after the manufactured quartz diffraction matrix is complicated by the fact that the diffraction relief depth corresponds to the polymer lens operation in the intraocular fluid and is therefore significantly greater than is required when working in air. We have developed a method for the energy distribution measuring over the foci of the BDRYOL diffraction component which based on the time planarization of the matrix relief by a photoresist layer. The diffraction relief filling with a material with a refractive index of a given value higher than refractive index of fused quartz makes it possible to achieve light focusing conditions equivalent to working in the intraocular environment, and also to measure the light energy distribution across the foci under conditions close to the calculated light wavelength in the visible range. The primary task at the moment is to obtain such a photoresist refractive index, which will provide the relief depth of the intraocular lens diffraction component, corresponding to the work in the vitreous body of the eye. The work is devoted to the selection of drying conditions and the method of measuring the photoresist refractive index.

Refractive lens exchange with the Acri. Twin asymmetric diffractive bifocal intraocular lens system

2010 ◽  
Vol 20 (3) ◽  
pp. 509-516 ◽  
Author(s):  
José F. Alfonso ◽  
Luis Fernández-Vega ◽  
Susana Ortí ◽  
Robert Montés-Micó
Keyword(s):  
Intraocular Lens ◽  
Lens System ◽  
Refractive Lens Exchange ◽  
Refractive Lens ◽  
Bifocal Intraocular Lens

Possibilities of using inhomogeneity in light energy distribution for estimating the degree of coherence of superposing waves

2012 ◽  
Vol 51 (10) ◽  
pp. C38 ◽  
Author(s):  
Claudia Yu. Zenkova ◽  
Mykhailo P. Gorsky ◽  
Iryna V. Soltys ◽  
Pavlo O. Angelsky
Keyword(s):  
Energy Distribution ◽  
Light Energy ◽  
Degree Of Coherence

Reading performance with a refractive multifocal and a diffractive bifocal intraocular lens

2002 ◽  
Vol 28 (11) ◽  
pp. 1957-1963 ◽  
Author(s):  
Sibylla Richter-Mueksch ◽  
Herbert Weghaupt ◽  
Christian Skorpik ◽  
Michaela Velikay-Parel ◽  
Wolfgang Radner
Keyword(s):  
Intraocular Lens ◽  
Reading Performance ◽  
Bifocal Intraocular Lens

scholarly journals Comparison of visual outcomes after bilateral implantation of a diffractive trifocal intraocular lens and blended implantation of an extended depth of focus intraocular lens with a diffractive bifocal intraocular lens

2017 ◽  
Vol Volume 11 ◽  
pp. 1911-1916 ◽  
Author(s):  
Andre Lins de Medeiros ◽  
Andre Gustavo de Araujo Rolim ◽  
Antonio Francisco Pimenta Motta ◽  
Bruna Vieira Ventura ◽  
César Vilar ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Depth Of Focus ◽  
Visual Outcomes ◽  
Extended Depth Of Focus ◽  
Bifocal Intraocular Lens

scholarly journals High-addition segmented refractive bifocal intraocular lens in inactive age-related macular degeneration: A multicenter pilot study

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0256985
Author(s):  
Gerd U. Auffarth ◽  
Josef Reiter ◽  
Martin Leitritz ◽  
Karl-Ulrich Bartz-Schmidt ◽  
Fabian Höhn ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Macular Degeneration ◽  
Intraocular Lens ◽  
Intraoperative Complications ◽  
Age Related Macular Degeneration ◽  
Open Label ◽  
Age Related ◽  
Near Visual Acuity ◽  
Reading Distance ◽  
Bifocal Intraocular Lens

This multicenter, open-label study aimed to determine the safety and functional outcome of a high-addition segmented refractive bifocal intraocular lens (IOL) in late inactive age-related macular degeneration (AMD). Twenty eyes of 20 patients were enrolled and followed until 12 months after the intervention. Patients underwent cataract surgery with implantation of a LS-313 MF80 segmented refractive bifocal intraocular lens with a near addition of +8.0 D (Teleon Surgical Vertriebs GmbH, Berlin, Germany). The main outcome measures were distance corrected near visual acuity (DCNVA) and safety as determined by intra- and post-operative complications. Secondary outcomes included distance corrected visual acuity (CDVA), uncorrected distance visual acuity (UDVA), uncorrected near visual acuity (UNVA), the need for magnification to read newspaper, preferred reading distance, speed and performance (logRAD), as well as patient satisfaction. Mean DCNVA improved from 0.95 (±0.19) to 0.74 (±0.35) logMAR, until 6 months after surgery, P<0.05. CDVA improved from 0.70 (±0.23) to 0.59 (±0.30) logMAR, UDVA from 0.94 (±0.25) to 0.69 (±0.34) logMAR, UNVA from 1.08 (±0.19) to 0.87 (±0.43) logMAR. The mean need for magnification decreased from 2.9- to 2.3-fold, preferred reading distance from 23 to 20 cm. No intraoperative complications occurred during any of the surgeries. One patient lost > 2 lines of CDVA between 6 and 12 months, in another case, the study IOL was exchanged for a monofocal one due to dysphotopsia and decreased CDVA. Implantation of a segmented refractive bifocal IOL with +8.0 D addition improves near and distance vision in patients with late AMD and has a satisfactory safety profile.

Long-term visual results of bifocal intraocular lens implantation

1999 ◽  
Vol 25 (9) ◽  
pp. 1263-1269 ◽  
Author(s):  
Teresio Avitabile ◽  
Filippo Marano ◽  
Emanuele G. Canino ◽  
Salvatore Biondi ◽  
Alfredo Reibaldi
Keyword(s):  
Intraocular Lens ◽  
Intraocular Lens Implantation ◽  
Lens Implantation ◽  
Visual Results ◽  
Bifocal Intraocular Lens
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