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Intraocular lenses

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https://www.readbyqxmd.com/read/29161162/patient-perceived-and-laboratory-measured-halos-associated-with-diffractive-bifocal-and-trifocal-intraocular-lenses
#1
Francisco Alba-Bueno, Nuria Garzón, Fidel Vega, Francisco Poyales, María S Millán
PURPOSE: To examine and assess the halos generated in distance vision by multifocal intraocular lenses (IOLs) using both in vitro objective and in vivo subjective methods. SETTING: The objective method was carried out in the optics laboratory of the Applied Optics and Image Processing Group (Universitat Politècnica de Catalunya -Barcelona). The psychophysical and subjective methods were carried out in the Instituto de Oftalmología Avanzada Madrid Innova Ocular...
November 21, 2017: Current Eye Research
https://www.readbyqxmd.com/read/29156473/-calculations-of-intraocular-lenses-implant-intended-to-minimise-postoperative-vertical-anisometropia
#2
Dieter Methling
Modern measuring instruments calculate the values of intraocular lenses implant preoperatively. This calculation is performed separately for each eye. No information is available on the postoperative binocular effect, especially in regard to vertical anisometropia (difference between the values of the vertical principial meridians of the right and the left spectacle lens). In this publication, a computer programme is introduced to calculate the values of intraocular lenses implant for both eyes together. With this program, vertical anisometropia is only 0...
November 20, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29156465/-pseudophacic-additive-lenses
#3
Fritz H Hengerer, Ina Conrad-Hengerer
Implantation of artificial intraocular lenses (IOL) after cataract removal today represents the standard of care in the field of anterior segment surgery. In refractive lens exchange cases the natural lens is replaced by an IOL to correct different types of refractive situations. In the majority of the operations the refractive result is satisfying with only few deviations from target refraction.But daily practice reveals some outliers from the intended corrections with the need for further refractive enhancements, respectively...
November 20, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29137026/implantation-of-artificialiris-a-customflex-irisprosthesis-in-a-trauma-patient-with-an-artisan-lens-a-case-report-and-review
#4
Farideh Doroodgar, Mahmoud Jabbarvand, Feizollah Niazi, Sana Niazi, Azad Sanginabadi
PURPOSE: To evaluate probable complications of ArtificialIris implantation with iris fixated intraocular lens. METHOD: Development of photophobia, glare, and psychological strain during face-to-face communication in a 23-year-old man with a widespread traumatic iris defect terminate to make a decision for performing implantation of an ArtificialIris (Humanoptics, Erlangen, Germany) under the remnant iris without removing the patient's existing Artisan lens. RESULTS: Without any intraoperative or postoperative complications, the patient's visual acuity increased by 1 line, the endothelial cell loss was comparable with the cell loss associated with standard cataract surgery, and the anterior-chamber depth and anterior-chamber anatomy did not change...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29131702/postoperative-refractive-errors-following-pediatric-cataract-extraction-with-intraocular-lens-implantation
#5
Maanasa Indaram, Deborah K VanderVeen
PURPOSE: Advances in surgical techniques allow implantation of intraocular lenses (IOL) with cataract extraction, even in young children. However, there are several challenges unique to the pediatric population that result in greater degrees of postoperative refractive error compared to adults. METHODS: Literature review of the techniques and outcomes of pediatric cataract surgery with IOL implantation. RESULTS: Pediatric cataract surgery is associated with several sources of postoperative refractive error...
November 13, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/29121615/restructuration-kinetics-of-amphiphilic-intraocular-lenses-during-aging
#6
Lionel Tortolano, Johanna Saunier, Senda Hammami, Katia Manerlax, Houssem Matmati, Bernard Do, Emile Jubeli, Elias Fattal, Najet Yagoubi
Photooxidation and hydrolysis are the two primary aging factors of intraocular lenses. Opacifications, dislocations, glistening and yellowing of the implanted acrylic lenses, which are due to chain scissions and depolymerization, are the consequences of aging from the clinical perspective. The purpose of this study was to examine the consequence of the aging of intraocular lenses on chemical and surface properties. Acrylic lenses made of poly acrylic-co-polystyrene polymer were artificially aged by photooxidation and hydrolysis from 2 to 20 years...
November 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29120719/supercritical-impregnation-and-optical-characterization-of-loaded-foldable-intraocular-lenses-using-supercritical-fluids
#7
Abir Bouledjouidja, Yasmine Masmoudi, Yanfeng Li, Wei He, Elisabeth Badens
PURPOSE: To prepare drug-loaded intraocular lenses (IOLs) used to combine cataract surgery with postoperative complication treatment through supercritical impregnation while preserving their optical properties. SETTING: Aix-Marseille Université, CNRS, Centrale Marseille, Laboratoire de Mécanique, Modélisation & Procédés Propres, Marseille, France, and He University Eye Hospital, Liaoning Province, China. DESIGN: Experimental study. METHODS: Supercritical impregnations of commercial foldable IOLs used in cataract surgery with ciprofloxacin (an antibiotic) and dexamethasone 21-phosphate disodium salt (an antiinflammatory drug) were performed in a noncontinuous mode...
October 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29120714/functional-magnetic-resonance-imaging-to-assess-neuroadaptation-to-multifocal-intraocular-lenses
#8
Andreia M Rosa, Ângela C Miranda, Miguel M Patrício, Colm McAlinden, Fátima L Silva, Miguel Castelo-Branco, Joaquim N Murta
PURPOSE: To evaluate the use of functional magnetic resonance imaging (MRI) to assess neuroadaptation to multifocal intraocular lenses (IOLs). SETTING: Faculty of Medicine, University of Coimbra, Coimbra, Portugal. DESIGN: Prospective case study. METHODS: Patients with bilateral diffractive IOL implantation after cataract surgery had functional MRI at postoperative intervals of 3 weeks and 6 months. A nonintervention control group was included as proof of concept...
October 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29117609/-in-vitro-evaluation-of-the-optical-quality-of-segmental-refractive-multifocal-intraocular-lenses
#9
Timur Mert Yildirim, Gerd Uwe Auffarth, Tamer Tandogan, Stephanie Liebing, Grzegorz Labuz, Chul Young Choi, Ramin Khoramnia
Objectives In customised patient care, it is important to know the optical quality of different intraocular lenses (IOL). In this study, the optical quality of three segmental intraocular lenses were compared. Materials and Methods The LENTIS Comfort LS-313 MF15, LENTIS Mplus X LS-313 MF30 and LENTIS High Add IOL LS-313 MF80 (Oculentis, Berlin, Germany) with a far power of + 21 D were analysed at the optical bench OptiSpheric IOL PRO (Trioptics GmbH, Wedel, Germany). The lenses have almost the same optical design but differ in the power of the near segment...
November 8, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29117412/in-vivo-measurement-of-longitudinal-chromatic-aberration-in-patients-implanted-with-trifocal-diffractive-intraocular-lenses
#10
Maria Vinas, Ana Gonzalez-Ramos, Carlos Dorronsoro, Vyas Akondi, Nuria Garzon, Francisco Poyales, Susana Marcos
PURPOSE: To measure the longitudinal chromatic aberration (LCA) by both psychophysical methods and in vivo double-pass retinal imaging in patients bilaterally implanted with trifocal diffractive intraocular lenses (IOLs). METHODS: Measurements were performed with a polychromatic adaptive optics system provided with a supercontinuum laser, a Hartmann-Shack wavefront sensor, a deformable mirror, a motorized Badal system, a pupil monitoring system, a double-pass retinal imaging channel, and a psychophysical channel with monochromatically illuminated stimuli...
November 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29117411/assessing-the-likely-effect-of-posterior-corneal-curvature-on-toric-iol-calculation-for-iols-of-2-50-d-or-greater-cylinder-power
#11
Benjamin R LaHood, Michael Goggin, Adrian Esterman
PURPOSE: To establish whether average refractive overcorrection or undercorrection of corneal astigmatism based on the orientation (rule) of the astigmatism occurs if toric intraocular lenses (IOLs) are calculated on the basis of anterior corneal measurements in eyes requiring toric IOL cylinder power of 2.50 diopters (D) or greater. METHODS: One hundred thirteen consecutive eyes with anterior corneal keratometric astigmatism requiring IOL cylinder power of 2.50 D or greater underwent phacoemulsification with IOL powers calculated using anterior corneal curvature data alone...
November 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29104957/scleral-fixated-intraocular-lenses-past-and-present
#12
Maxwell S Stem, Bozho Todorich, Maria A Woodward, Jason Hsu, Jeremy D Wolfe
Intraocular lenses (IOLs) can have inadequate support for placement in the capsular bag as a result of ocular trauma, metabolic or inherited conditions such as Marfan's syndrome or pseudoexfoliation, or complicated cataract surgery. Surgical options for patients with inadequate capsular support include alternative placement in the anterior chamber (ACIOLs), fixation to the iris, or fixation to the sclera. The surgical techniques for each of these approaches have improved considerably over the last several decades resulting in improved visual and ocular outcomes...
March 2017: J Vitreoretin Dis
https://www.readbyqxmd.com/read/29095259/comparison-of-hydrophobic-and-hydrophilic-intraocular-lens-in-preventing-posterior-capsule-opacification-after-cataract-surgery-an-updated-meta-analysis
#13
Yang Zhao, Ke Yang, Jiaxin Li, Yang Huang, Siquan Zhu
BACKGROUND: Posterior capsular opacification (PCO) is a common long-term complication of cataract surgery. Intraocular lens design and material have been implicated in influencing the development of PCO. This study evaluated the association of hydrophobic and hydrophilic intraocular lenses on preventing PCO. METHODS: Medline, Cochrane, EMBASE, and Google Scholar databases were searched until August 3, 2016, using the following search terms: cataract, posterior capsule opacification, and intraocular lens...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29094328/incidence-of-endophthalmitis-and-the-perioperative-practices-of-cataract-surgery-in-japan-japanese-prospective-multicenter-study-for-postoperative-endophthalmitis-after-cataract-surgery
#14
Tomoyuki Inoue, Toshihiko Uno, Norio Usui, Shinichiro Kobayakawa, Kiyoshi Ichihara, Yuichi Ohashi
PURPOSE: To prospectively survey the incidence of endophthalmitis following cataract surgery and investigate the current perioperative practices in Japan. METHODS: Patients who underwent cataract surgery from January 2012 to December 2013 were included. Information on perioperative practices were recorded prospectively. Clinical characteristics were examined in cases with endophthalmitis. RESULTS: A total of 63,244 patients who underwent cataract surgery in 205 facilities were enrolled...
November 1, 2017: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29090052/review-of-static-approaches-to-surgical-correction-of-presbyopia
#15
REVIEW
Mohammad Ali Zare Mehrjerdi, Masomeh Mohebbi, Mehdi Zandian
Presbyopia is the primary cause of reduction in the quality of life of people in their 40s, due to dependence on spectacles. Therefore, presbyopia correction has become an evolving and rapidly progressive field in refractive surgery. There are two primary options for presbyopia correction: the dynamic approach uses the residual accommodative capacity of the eye, and the static approach attempts to enhance the depth of focus of the optical system. The dynamic approach attempts to reverse suspected pathophysiologic changes...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29084004/astigmatism-evaluation-prior-to-cataract-surgery
#16
Pankaj C Gupta, Jane T Caty
PURPOSE OF REVIEW: To evaluate and summarize literature from the past 18 months reporting advancements and issues in astigmatism assessment prior to cataract surgery. RECENT FINDINGS: New and updated toric calculators and regression formulas offer the opportunity for more accurate lens selection for our patients. Concurrently, improvements in topographic evaluation of corneal keratometry have allowed for a decrease in unplanned residual corneal astigmatism. Measuring posterior corneal astigmatism is especially valuable in eyes with keratoconus when planning to implant toric intraocular lens (IOL) and now allows access to this patient population...
October 27, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/29082089/intra-ocular-lens-optical-changes-resulting-from-the-loading-of-dexamethasone
#17
José M Artigas, M Carmen García-Domene, Amparo Navea, Pablo Botella, Eduardo Fernández
To study the optical changes on hydrogel-silicone intraocular lenses (IOLs) resulting from loading them with dexamethasone. We used prototype hydrogel(pHEMA)-silicone IOLs and loaded the matrices with an anti-inflammatory drug (dexamethasone). The optical properties we analyzed experimentally were a) modulation transfer function (MTF); b) spectral transmission; c) diopter power. These determinations were performed on drug-loaded IOLs, IOLs that had released the drug, and IOLs that had not been drug-loaded. Loading a hydrogel-silicone IOL with dexamethasone results in impairment of its optical qualities, in particular its MTF and spectral transmission, but not dioptric power...
October 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29078224/-spontaneous-iol-dislocation-what-can-we-do-for-prevention
#18
Joern Kuchenbecker
IOL dislocation and opacification represent further complications of modern IOL (intraocular lenses) implantation. Currently, an increase of IOL dislocation due to various reasons is observed. Due to capsular bag shrinkage, especially in patients with pseudoexfoliation (PEX) and other ocular condition, there is an increasing tension of the weakened zonula. The only use of capsular tension ring (CRT) is not sufficient. The shrinkage of the capsular bag and increasing tension of the zonula may be reduced by additional anterior capsule incisions...
October 27, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29075017/assessment-of-a-novel-pinhole-supplementary-implant-for-sulcus-fixation-in-pseudophakic-cadaver-eyes
#19
K T Tsaousis, L Werner, C L C Trindade, J Guan, J Li, N Reiter
PurposeTo evaluate a novel small-aperture supplementary implant that applies the principle of pinholes for management of irregular astigmatism, in postmortem human eyes.MethodsPseudophakic human cadaver eyes were imaged by anterior segment optical coherence tomography (AS-OCT) to assess position of the in-the-bag intraocular lens (IOL). Eyes were prepared as per the Miyake-Apple technique. Two versions of the supplementary implant (open-loop and tripod designs) were then inserted into the sulcus of each eye...
October 27, 2017: Eye
https://www.readbyqxmd.com/read/29073156/comparison-of-clinical-performance-between-trifocal-and-bifocal-intraocular-lenses-a-meta-analysis
#20
Zequan Xu, Danmin Cao, Xu Chen, Song Wu, Xin Wang, Qiang Wu
PURPOSE: To compare the clinical performance between trifocal and bifocal intraocular lenses in bilateral cataract and/or refractive lens exchange (RLE) surgery. METHODS: A comprehensive literature search of PubMed, EMBASE, Cochrane Controlled Trials Register and Web of Science was performed through October 2016 to identify randomized, controlled trials (RCTs) and comparative cohort studies. The primary outcomes were uncorrected distance visual acuity (UDVA), uncorrected intermediate visual acuity (UIVA), uncorrected near visual acuity (UNVA), defocus curve, spectacle independence, patient satisfaction and contrast sensitivity...
2017: PloS One
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