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Intraocular lens silicon

Yusuke Ito, Ikuo Yamazaki, Yoichi Kikuchi, Eri O'uchi, Toshihiro O'uchi, Hiroaki Kato, Kazuki Hotta
Recognizing imaging characteristics after ophthalmic surgery is necessary for radiologists to prevent misdiagnosis. We review typical appearances of intraorbital implanted devices and materials on CT and MRI with demonstration of the common surgical procedures. EX-PRESS glaucoma filtration devices appear as punctate areas of metal attenuation on CT and are typically placed at the corneoscleral junction. The imaging manifestations after cataract extraction are absence of the native lens of ovoid mass and the intraocular lens with high attenuation on CT and low signal intensity on MRI...
October 13, 2016: Japanese Journal of Radiology
Wei Fang, Jiuke Li, Xiaohong Jin, Jing Zhai, Yuanmin Dai, Yumin Li
BACKGROUND: Refraction change of silicone oil (SO) tamponade in phakic and aphakic eye has been studied thoroughly; however, it is rarely studied in pseudophakic eye. In this paper we aimed to deduce a theoretical formula predicting refractive shift of silicone oil tamponade in pseudophakic eye and compared it with clinical findings. METHOD: A theoretical formula was deduced through strict geometric optical principles under the Helmholtz Schematic eye model. Pre/postoperative refractive status of patients who previously underwent phacoemulsification, intraocular lens (IOL) implant, vitrectomy, SO tamponade and required SO extraction was studied...
2016: BMC Ophthalmology
Chan Zhao, Meifen Zhang, Fei Gao, Fangtian Dong
PURPOSE: To describe surgical outcomes of macular detachment caused by subretinal fibrosis (SRF) in Vogt-Koyanagi-Harada disease (VKH). METHODS: Retrospective review of VKH patients who underwent SRF removal surgery. RESULTS: Seven eyes of six VKH patients with preoperative BCVA ranging from light perception to 20/250 were included. Six eyes underwent uncomplicated SRF removal with C3F8 or silicone oil (SO) tamponade and the following optional primary or subsequent procedures: intravitreal injection of triamcinolone acetonide, SO removal, lensectomy, or phacoemulsification with intraocular lens (IOL) implantation...
August 5, 2016: Ocular Immunology and Inflammation
Diana Silva, Luís F V Pinto, Dimitriya Bozukova, Luís F Santos, Ana Paula Serro, Benilde Saramago
In this study we investigated the possibility of using layer-by-layer deposition, based in natural polymers (chitosan and alginate), to control the release of different ophthalmic drugs from three types of lens materials: a silicone-based hydrogel recently proposed by our group as drug releasing soft contact lens (SCL) material and two commercially available materials: CI26Y for intraocular lens (IOLs) and Definitive 50 for SCLs. The optimised coating, consisting in one double layer of (alginate - CaCl2)/(chitosan+glyoxal) topped with a final alginate-CaCl2 layer to avoid chitosan degradation by tear fluid proteins, proved to have excellent features to control the release of the anti-inflammatory, diclofenac, while keeping or improving the physical properties of the lenses...
November 1, 2016: Colloids and Surfaces. B, Biointerfaces
Jack Li, Liliana Werner, Jun J Guan, Nicholas Reiter, Nick Mamalis
PURPOSE: To evaluate the long-term biocompatibility and safety of the new SC9 intraocular lens (IOL) after implantation in rabbit eyes, in accordance with the requirements of the International Organization for Standardization 11979-5, Annex G:2006(E). SETTING: John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA. DESIGN: Experimental study. METHODS: Bilateral phacoemulsification was performed on 9 New Zealand white rabbits; 1 eye received the test IOL and the contralateral eye received a commercially available plate-type silicone control IOL (AA4204VL)...
July 2016: Journal of Cataract and Refractive Surgery
Jury Kim, Young-Jun Kim, Dong-Beom Ji, Min-Su Kim
A slow loris, Nycticebus coucang , was brought to Ji Dong Beom Animal Hospital from the National Institute of Ecology due to globe enlargement and frequent blepharospasm of the right eye. Ophthalmic diagnoses included glaucoma with posterior lens luxation and cataract. Because this animal was on exhibition at the National Institute of Ecology, preservation of the eyeball by intraocular silicone implantation following evisceration rather than enucleation was selected. Before the surgery, examination of the normal left eye was performed using Retcam and spectral domain optical coherence tomography...
June 2016: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
Remya Mareen Paulose, Joveeta Joseph, Raja Narayanan, Savitri Sharma
BACKGROUND: Endophthalmitis caused by non-tuberculous mycobacteria (NTM) is a rare condition seen after surgery and trauma. This study reports a retrospective, consecutive, non-comparative case series of 5 patients referred to L. V. Prasad Eye Institute, Hyderabad, and diagnosed with culture-proven NTM endophthalmitis between January 2004 and April 2015. Data collected included demographic information, presenting features, microbiology investigation, treatment course, and final visual outcome...
December 2016: Journal of Ophthalmic Inflammation and Infection
Elena Lanchares, María A Del Buey, José A Cristóbal, Begoña Calvo, Francisco J Ascaso, Mauro Malvè
A finite element model (FE) of the eye including cornea, sclera, crystalline lens, and ciliary body was created to analyze the influence of the silicone encircling bandwidth and the tightness degree on the myopia induced by scleral buckling (SB) procedure for rhegmatogenous retinal detachment. Intraocular pressure (IOP) was applied to the reference geometry of the FE model and then SB surgery was simulated with encircling bandwidths of 1, 2, and 2.5 mm. Different levels of tightening and three values of IOP were applied...
2016: Journal of Ophthalmology
Gui-Qin Wang, Ya-Long Dang, Qi Huang, Victor Chi-Pang Woo, Kwok-Fai So, Jimmy Shiu-Ming Lai, George Pak-Man Cheng, Kin Chiu
OBJECTIVE: To investigate the biological effects of different intraocular lens (IOL) materials on the adhesion, migration, morphology, and epithelial-to-mesenchymal transition (EMT) of human lens HLEB3 cells. MATERIALS AND METHODS: Human HLEB3 cells were seeded onto IOLs composed of four different materials (polymethyl methacrylate (PMMA), silicone elastomer, hydrophilic acrylic, and hydrophobic acrylic). The levels of cellular adhesion, migration, morphology, and EMT were then quantified using a cell viability assay, scratch test, phase contrast microscopy, and immunofluorescence staining, respectively...
June 24, 2016: Current Eye Research
Liliana Werner, John C Stover, Jim Schwiegerling, Kamal K Das
PURPOSE: To evaluate light scatter and stray light in intraocular lenses (IOLs) explanted because of postoperative opacification (13 calcified hydrophilic acrylic, 1 calcified silicone, and 4 polymethylmethacrylate [PMMA] lenses with snowflake degeneration), as well as effect of opacification on other optical quality/performance indicators, in comparison with controls. METHODS: The Complete Angle Scatter Instrument (CASI) scatterometer was used to measure the forward light scattering (FLS) of the IOLs, and the stray light values at various angles were calculated from the measured FLS...
June 1, 2016: Investigative Ophthalmology & Visual Science
Tsutomu Hara, Takeshi Hara, Takako Hashimoto, Yuta Motoyama, Masaya Narita
PURPOSE: Closed 9.5-mm-diameter endocapsular equator rings (E-rings) prevent posterior capsular opacification (PCO). However, in our research, some highly myopic patients unexpectedly developed late, extensive PCO that required capsulotomy. We also report for the first time how the capsule reacted to neodymium-doped yttrium aluminium garnet (Nd:YAG) laser shots. METHODS: Sixty-two eyes (39 patients; average age, 48 ± 13.2 years) were implanted with a closed, square-edged silicone E-ring (outer diameter, 9...
September 2016: Japanese Journal of Ophthalmology
Xin Liu, Fan Fan, Xiaoying Wang, Yi Lu, Tianyu Zheng, Peng Zhou, Xingtao Zhou, Yi Luo
Purpose. To analyze the safety, effectiveness, and stability of triplex surgery for phakic 6H anterior chamber phakic intraocular lens explantation and phacoemulsification with in-the-bag IOL implantation for super high myopia in long-term observations. Methods. This retrospective case series evaluated 16 eyes of 10 patients who underwent triplex surgery. Best corrected visual acuity (BCVA), endothelial cell density (ECD), and associated adverse events were evaluated. Results. The mean follow-up time after the triplex surgery was 46 ± 14 months...
2016: Journal of Ophthalmology
Joseph C Salamone, Ann Beal Salamone, Katelyn Swindle-Reilly, Kelly Xiaoyu-Chen Leung, Rebecca E McMahon
Providing improved health care for wound, burn and surgical patients is a major goal for enhancing patient well-being, in addition to reducing the high cost of current health care treatment. The introduction of new and novel biomaterials and biomedical devices is anticipated to have a profound effect on the future improvement of many deleterious health issues. This publication will discuss the development of novel non-stinging liquid adhesive bandages in healthcare applications developed by Rochal Industries...
June 2016: Regenerative Biomaterials
A A Kas'yanov, S V Sdobnikova, N A Troitskaya, E G Ryzhkova
AIM: to evaluate the accuracy of different modified methods for axial length (AL) measurement in silicone-filled eyes. MATERIAL AND METHODS: The study was conducted in a group of 60 patients (60 eyes) with silicone oil tamponade (Oxane 1300 cst). Axial length measurements were taken using IOL Master optical coherence biometry ('silicone-filled eye' mode) and modified A-scan ultrasound biometry (velocity of ultrasound passing through the vitreous body set at 980 m/s and 1000 m/s)...
September 2015: Vestnik Oftalmologii
Uzeyır Gunenc, Taylan Ozturk, Gul Arikan, Mahmut Kaya
Post-traumatic aniridia combined with aphakia may be seen after globe injury. Aside from esthetic aspects, partial or total loss of the iris tissue may also be related to various degrees of glare and photophobia. Such patients suffer from severe visual impairment secondary to aphakia. Herein we describe a novel surgical technique for the management of an aphakic eye with traumatic aniridia for a patient who underwent transscleral fixation of a custom-tailored artificial iris prosthesis combined with a rigid intraocular lens (IOL)...
February 2016: Arquivos Brasileiros de Oftalmologia
Mumin Hocaoglu, Murat Karacorlu, Isil Sayman Muslubas, Hakan Ozdemir, Serra Arf, Omer Uysal
AIMS: To evaluate the incidence of and factors contributing to intraoperative and postoperative complications of eyes with previous pars plana vitrectomy (PPV) undergoing phacoemulsification and intraocular lens (IOL) implantation for cataract. METHODS: The intraoperative and postoperative complications and observations in 513 eyes of 485 patients with previous PPV undergoing sutured and sutureless cataract surgery were assessed. Associations between preoperative characteristics and complications during and after the surgery were explored...
September 2016: British Journal of Ophthalmology
Paloma Mazoteras, Ricardo Pedro Casaroli-Marano
PURPOSE: To study the disposition of bacterial adhesion to intraocular lens (IOL) biomaterials depending on the material and region of the optic IOL surface: center or peripheral edge. SETTING: School of Medicine, University of Barcelona, Barcelona, Spain. DESIGN: Experimental study. METHODS: For the in vivo study, IOLs were explanted from donor ocular globes without clinical symptoms of endophthalmitis. Biofilm formation was qualitatively studied by scanning electron microscopy (SEM)...
September 2015: Journal of Cataract and Refractive Surgery
M Bruno, M Nebbioso, E Rigoni, A Gagliardi, E M Vingolo
BACKGROUND AND AIM: Complicated Cataract is frequently associated with Retinitis Pigmentosa (RP). This retinopathy is a great cause of visual impairment, and cataract surgery may resolve partially the situation and restore sight. Unfortunately, in this case there is a very high incidence of Posterior Capsule Opacity (PCO) ranging in several studies a percentage of 100% at six months. Our goal was to evaluate whether the high incidence of PCO is associated to specific type of Intraocular Lens (IOL) biomaterials...
2015: La Clinica Terapeutica
Cosmin Rosca, Mihnea Munteanu, Irina Tamasoi, Zarko Petrovic, Nicolae Balica, Cristina Nicula, Octavian Cretu
No abstract text is available yet for this article.
September 2016: Acta Ophthalmologica
Gregory D Kramer, Liliana Werner, Kyle MacLean, Aabid Farukhi, Gareth L Gardiner, Nick Mamalis
PURPOSE: To evaluate the stability and capsular bag opacification of a smooth or a patterned silicone protective membrane implanted in the bag with secondary placement of an intraocular lens (IOL). SETTING: John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA. DESIGN: Experimental study. METHODS: Twelve New Zealand rabbits had bilateral implantation of a protective membrane and an IOL or an IOL alone...
August 2015: Journal of Cataract and Refractive Surgery
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