scholarly journals Development of a novel multifocal lens using a polarization directed flat lens: possible candidate for a multifocal intraocular lens

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Kyung-Sun Na ◽  
Chang Su Lee ◽  
Da Ran Kim ◽  
Seok Ho Song ◽  
Soo Yeon Cho ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Focal Length ◽  
Polarization State ◽  
Optical Quality ◽  
Bench Test ◽  
Optical Bench ◽  
Multifocal Intraocular Lens ◽  
Multifocal Iol ◽  
Distant Target ◽  
Multifocal Lens

Abstract Background A polarization-directed flat (PDF) lens acts as a converging lens with a focal length (f) > 0 and a diverging lens with f < 0, depending on the polarization state of the incidental light. To produce a multifocal lens with two focal lengths, a PDF and a converging lens having shorter focal length were combined. In this study, we tested a bifocal PDF to determine its potential as a new multifocal intraocular lens (IOL). Methods Constructed a multifocal lens with a PDF lens (f = +/− 100 mm) and a converging lens (f = + 25 mm). In an optical bench test, we measured the defocus curve to test the multifocal function. The multifocal function and optical quality of the lens in various situations were tested. An Early Treatment Diabetic Retinopathy Study (ETDRS) chart as a near target and a building as a distant target were photographed using a digital single-lens reflex (DSLR) camera. Both lenses (multifocal and monofocal) were tested under the same conditions. Results For the 0 D and − 20 D focal points, the multifocal lens showed sharp images in the optical bench test. In the DSLR test using the multifocal lens, the building appeared slightly blurry compared with the results using the monofocal lens. With the multifocal lens, the ETDRS chart’s images became blurry as the ETDRS chart’s distance decreased, but became very clear again at a certain position. Conclusions We confirmed the multifocal function of the multifocal lens using a PDF lens. This lens can be used as a multifocal IOL in the future.

Development of a novel multifocal lens using a polarization directed flat lens: Possible candidate for a multifocal intraocular lens

2021 ◽  
Author(s):  
Kyung-Sun Na ◽  
Chang Su Lee ◽  
Da Ran Kim ◽  
Soo Yeon Cho ◽  
Eun Chul Kim ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Focal Length ◽  
Polarization State ◽  
Optical Quality ◽  
Bench Test ◽  
Optical Bench ◽  
Multifocal Intraocular Lens ◽  
Multifocal Iol ◽  
Parking Lot ◽  
Multifocal Lens

Abstract Background: A polarization-directed flat (PDF) lens acts as a converging lens with a focal length (f) > 0 and a diverging lens with f < 0, depending on the polarization state of the incidental light. To produce a multifocal lens with two focal lengths, a PDF and a converging lens having shorter focal length were combined. In this study, we tested to determine its potential as a new multifocal intraocular lens (IOL).Methods: Constructed a multifocal lens with a PDF lens (f=+/- 100 mm) and a converging lens (f= +50 mm). In an optical bench test, we measured the lens’s focal lengths to test the multifocal function. The multifocal function and optical quality of the lens in various situations were tested. An Early Treatment Diabetic Retinopathy Study (ETDRS) chart as a near target and a parking lot as a distant target were photographed using a digital single-lens reflex (DSLR) camera. Both lenses (multifocal and monofocal) were tested under same conditions. Results: In the optical bench test, the multifocal lens’s focal lengths were 31.2 and 71.2 mm. In the DSLR test using the multifocal lens, the parking lot appeared slightly cloudy compared to the monofocal lens results. With the multifocal lens, the ETDRS chart’s images became blurry as the ETDRS chart’s distance decreased, but became very clear again at a certain position.Conclusions: We confirmed the multifocal function of the multifocal lens using a PDF lens. This lens can be used as a multifocal IOL in the future.

scholarly journals Evaluation of Optical Quality Parameters and Ocular Aberrations in Multifocal Intraocular Lens Implanted Eyes

2014 ◽  
Vol 55 (5) ◽  
pp. 1413 ◽  
Author(s):  
Hun Lee ◽  
Kwanghyun Lee ◽  
Ji Min Ahn ◽  
Eung Kweon Kim ◽  
Bradford Sgrignoli ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Quality Parameters ◽  
Optical Quality ◽  
Multifocal Intraocular Lens ◽  
Ocular Aberrations

scholarly journals Optical bench performance of a novel trifocal intraocular lens compared with a multifocal intraocular lens

2016 ◽  
pp. 1031 ◽  
Author(s):  
Shinwook Lee ◽  
Myoung Choi ◽  
Zaiwei Xu ◽  
Zeyu Zhao ◽  
Elsinore Alexander ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Optical Bench ◽  
Multifocal Intraocular Lens

scholarly journals In Vitro Aberrometric Assessment of a Multifocal Intraocular Lens and Two Extended Depth of Focus IOLs

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Vicente J. Camps ◽  
Angel Tolosa ◽  
David P. Piñero ◽  
Dolores de Fez ◽  
María T. Caballero ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Wavefront Sensor ◽  
Optical Bench ◽  
Depth Of Focus ◽  
Multifocal Intraocular Lens ◽  
Extended Depth Of Focus ◽  
Presbyopia Correction

Purpose. To analyze the “in vitro” aberrometric pattern of a refractive IOL and two extended depth of focus IOLs.Methods. A special optical bench with a Shack-Hartmann wavefront sensor (SH) was designed for the measurement. Three presbyopia correction IOLs were analyzed: Mini WELL (MW), TECNIS Symfony ZXR00 (SYM), and Lentis Mplus X LS-313 MF30 (MP). Three different pupil sizes were used for the comparison: 3, 4, and 4.7 mm.Results. MW generated negative primary and positive secondary spherical aberrations (SA) for the apertures of 3 mm (−0.13 and +0.12 μm), 4 mm (−0.12 and +0.08 μm), and 4.7 mm (−0.11 and +0.08 μm), while the SYM only generated negative primary SA for 4 and 4.7 mm apertures (−0.12 μm and −0.20 μm, resp.). The MP induced coma and trefoil for all pupils and showed significant HOAs for apertures of 4 and 4.7 mm.Conclusions.In an optical bench, the MW induces negative primary and positive secondary SA for all pupils. The SYM aberrations seem to be pupil dependent; it does not produce negative primary SA for 3 mm but increases for higher pupils. Meanwhile, the HOAs for the MW and SYM were not significant. The MP showed in all cases the highest HOAs.

scholarly journals Correction of High Astigmatism after Penetrating Keratoplasty with Toric Multifocal Intraocular Lens Implantation

2017 ◽  
Vol 8 (2) ◽  
pp. 385-388 ◽  
Author(s):  
Raffaele Nuzzi ◽  
Francesca Monteu
Keyword(s):  
Intraocular Lens ◽  
Penetrating Keratoplasty ◽  
Multifocal Intraocular Lens ◽  
Iol Implantation ◽  
Multifocal Iol ◽  
Therapeutic Choice ◽  
Lens Implantation ◽  
Corneal Leukoma ◽  
Relaxing Incisions

After penetrating keratoplasty (PK), high astigmatism is often induced, being frequently about 4–6 dpt. According to the entity and typology of astigmatism, different methods of correction can be used. Selective suture removal, relaxing incisions, wedge resections, compression sutures, photorefractive keratectomy, and laser-assisted in situ keratomileusis can reduce corneal astigmatism and ametropia, but meanwhile they can cause a reduction in the corneal integrity and cause an over- or undercorrection. In case of moderate-to-high regular astigmatisms, the authors propose a toric multifocal intraocular lens (IOL) implantation to preserve the corneal integrity (especially in PK after herpetic corneal leukoma keratitis). We evaluated a 45-year-old patient who at the age of 30 was subjected to PK in his left eye due to corneal leukoma herpetic keratitis, which led to high astigmatism (7.50 dpt cyl. 5°). The patient was subjected to phacoemulsification and customized toric multifocal IOL implantation in his left eye. The correction of PK-induced residual astigmatism with a toric IOL implantation is an excellent choice but has to be evaluated in relation to patient age, corneal integrity, longevity graft, and surgical risk. It seems to be a well-tolerated therapeutic choice and with good results.

In vitro optical quality comparison of 2 trifocal intraocular lenses and 1 progressive multifocal intraocular lens

2016 ◽  
Vol 42 (1) ◽  
pp. 138-147 ◽  
Author(s):  
Alberto Domínguez-Vicent ◽  
Jose Juan Esteve-Taboada ◽  
Antonio J. Del Águila-Carrasco ◽  
Daniel Monsálvez-Romin ◽  
Robert Montés-Micó
Keyword(s):  
Intraocular Lens ◽  
Optical Quality ◽  
Intraocular Lenses ◽  
Multifocal Intraocular Lens

scholarly journals Comparative Analysis of Visual Performance and Optical Quality with a Rotationally Asymmetric Multifocal Intraocular Lens and an Apodized Diffractive Multifocal Intraocular Lens

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Xiao Wang ◽  
Haixia Tu ◽  
Yong Wang
Keyword(s):  
Visual Acuity ◽  
Cataract Surgery ◽  
Intraocular Lens ◽  
Visual Function ◽  
Optical Quality ◽  
Modulation Transfer ◽  
Multifocal Intraocular Lens ◽  
Distance Visual Acuity ◽  
Age Related ◽  
Significant Difference

Purpose. To compare the short-term visual outcomes and intraocular optical performance of a rotationally asymmetric multifocal intraocular lens (MIOL) (SBL-3, Lenstec, Inc., Christ Church, Barbados) and an apodized diffractive MIOL (the Acrysof IQ ResTOR SN6AD1, Alcon Laboratories, Inc., Fort Worth, Texas, United States). Methods. A prospective, comparative, nonrandomized, and single-center study. Sixty-eight age-related cataract patients (81 eyes) after phacoemulsification cataract surgery and in-the-bag MIOL implantation were enrolled. Thirty-eight eyes received SBL-3, and 43 eyes received SN6AD1. Ophthalmological evaluation included uncorrected distance visual acuity (UDVA), uncorrected intermediate visual acuity (UIVA), uncorrected near visual acuity (UNVA), corrected distance visual acuity (CDVA), modulation transfer function (MTF), Strehl ratio (SR), intraocular aberrations (4 mm optical zone), and defocus curve at 3 months postoperatively. The Chinese version of the visual function index-14 (VF-12-CN) and spectacle independence were assessed in all patients. Results. There was no statistically significant difference between groups in postoperative UDVA (p=0.186). Postoperative UIVA and UNVA were significantly better for the SBL-3 group than for the SN6AD1 group (p<0.01). Statistically significant differences were revealed in defocus levels from –3.50 D to −4.00 D with better visual acuities for the SBL-3 group (p<0.01). For intraocular optical quality outcomes, statistically significant differences between groups were observed in RMS of intraocular total aberrations, coma, and trefoil high-order aberrations, presenting significantly higher values of these parameters in the eyes of the SBL-3 group (p < 0.01). Statistically significant differences were revealed in the MTF values at spatial frequencies of 5 and 10 cycles/degree between groups. There were no significant differences in scores of VF-12-CN, and spectacle independence between the groups (p>0.05). Conclusions. Both MIOLs were able to successfully restore visual function after cataract surgery. SBL-3 provided better UIVA and UNVA with a wider range of intermediate vision.

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