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

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.

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

BMC Ophthalmology ◽

10.1186/s12886-021-02191-z ◽

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.

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

Journal of Cataract & Refractive Surgery ◽

10.1016/j.jcrs.2015.06.040 ◽

2016 ◽

Vol 42 (1) ◽

pp. 138-147 ◽

Cited By ~ 16

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

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Clinical Results and Optical Quality of Diffractive Multifocal Intraocular Lens

Journal of the Korean Ophthalmological Society ◽

10.3341/jkos.2015.56.12.1867 ◽

2015 ◽

Vol 56 (12) ◽

pp. 1867 ◽

Cited By ~ 2

Author(s):

Jeong Jae Oh ◽

Jin Seok Choi

Keyword(s):

Intraocular Lens ◽

Clinical Results ◽

Optical Quality ◽

Multifocal Intraocular Lens

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

Journal of Ophthalmology ◽

10.1155/2020/7923045 ◽

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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Clinical outcomes and intraocular optical quality of a diffractive multifocal intraocular lens with asymmetrical light distribution

Journal of Cataract & Refractive Surgery ◽

10.1016/j.jcrs.2007.11.057 ◽

2008 ◽

Vol 34 (6) ◽

pp. 942-948 ◽

Cited By ~ 67

Author(s):

Jorge L. Alió ◽

Bassam Elkady ◽

Dolores Ortiz ◽

Gonzalo Bernabeu

Keyword(s):

Clinical Outcomes ◽

Intraocular Lens ◽

Optical Quality ◽

Light Distribution ◽

Multifocal Intraocular Lens

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Lack of Effect of Intraocular Lens Asphericity on Visual Performance with Acrylic Intraocular Lenses

European Journal of Ophthalmology ◽

10.5301/ejo.2011.6356 ◽

2011 ◽

Vol 21 (6) ◽

pp. 723-731 ◽

Cited By ~ 4

Author(s):

Gonzalo Muñoz ◽

César Albarrán-Diego ◽

Ma Ángeles Galotto ◽

Javier Pascual ◽

Teresa Ferrer-Blasco

Keyword(s):

Visual Acuity ◽

Contrast Sensitivity ◽

Intraocular Lens ◽

Spherical Aberration ◽

Optical Quality ◽

Intraocular Lenses ◽

Bilateral Cataract ◽

Quality Of Vision ◽

Ocular Aberrations

Purpose. To determine whether implantation of acrylic intraocular lens (IOL) with aspheric design (Tecnis Z9003, AMO) results in improved visual acuity or contrast sensitivity compared with conventional spherical acrylic IOL (AR40e, AMO). Methods. In an intraindividual randomized prospective study of 60 patients with bilateral cataract, the Tecnis Z9003 IOL was compared with the AR40e IOL. Ocular aberrations for a 4.0-mm pupil and 6.0-mm pupil were measured with a Hartmann-Shack aberrometer. Quality of vision was measured using visual acuity and contrast sensitivity under mesopic and photopic conditions. Results. Eyes with the Tecnis Z9003 IOL had significantly less spherical aberration and greater Strehl ratio after surgery, showing a better optical quality in comparison with the standard spherical IOL. However, visual acuity and both mesopic and photopic contrast sensitivity were not significantly different between the groups. Conclusions. The significantly better optical quality achieved with the aspheric acrylic IOL design did not result in improved visual acuity or contrast sensitivity in comparison with a conventional spherical acrylic IOL.

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