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Intraocular lens silicon

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https://www.readbyqxmd.com/read/28674834/intraocular-silicone-implant-to-treat-chronic-ocular-hypotony-an-in-vivo-trial
#1
Wesal Bayoudh, Dörthe Carstesen, Peter Walter, Andreas W A Weinberger
PURPOSE: The management of chronic ocular hypotony and complicated proliferative vitreoretinopathy-related retinal detachment represents a challenge. Being non-absorbable and non-biodegradable, a silicone oil implant is expected to restore the volume and the intraocular pressure of the globe, as well as to approximate the detached retina. Further advantages could be a long-term tamponade potential, absence of toxicity, and prevention of silicone oil emulsification or anterior chamber oil-prolapse...
July 3, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28663881/achromatic-doublet-intraocular-lens-for-full-aberration-correction
#2
Enrique J Fernandez, Pablo Artal
A doublet intraocular lens optimized for both chromatic and monochromatic aberration correction in pseudophakic eyes is presented. Ray-tracing techniques were applied to design the lens in white light within a chromatic eye model. Combinations of two materials, already commonly used in intraocular lenses, as acrylic and silicone, were used. Iterative optimization algorithms were employed to correct for longitudinal chromatic aberration, spherical aberration and off-axis aberrations within 10 degrees of visual field...
May 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28560848/advanced-silicon-chemistry-in-australia-forming-strong-links-with-asia
#3
Stephen Clarke, Kim-Anh Thi Nguyen, Elda Markovic, Neil Trout, Milena Ginic-Markovic, Janis Matisons, Michael Owen, Daniel Graiver, Agus Hadi Santosa Wargadipura, Sudirman Habibie, Dwi Gustiono, Bok Ryul Yoo, Joe Mifsud
This paper details Australian commercial and academic silicon research. Areas of interest include silicon metal, polysiloxane polymers, copolymers, cyclics, emulsions, microemulsions, silanes, silane coupling agents, sol-gel chemistry and water-treatments, porous silicon, polysiloxane degradation, silicon hydrogel contact lenses, silanolate synthesis, siloxane interfacial polymerisation, hydrosilylation, polysiloxane electrolytes for lithium ion batteries, silanes for PBX materials, octafunctionalized polyhedral oligomeric silsesquioxanes (POSS), POSS hybrids, sol-gel hydrogenation catalysts, silane modification of silica, sol-gel energy storage, silicate grout stabilisation, GeoPolymer concretes, aerogel insulating foams, "Phaco-Ersatz" Accommodating Gel-Intraocular Lens technologies...
June 1, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28540021/minimally-invasive-surgery-for-the-removal-of-posterior-intraocular-foreign-bodies
#4
Jesus Hernan Gonzalez-Cortes, Yunuen Bages-Rousselon, Jesus Emiliano Gonzalez-Cantu, Jesus Mohamed-Hamsho
This is a prospective clinical assay that included six patients who were diagnosed with penetrating corneal injury, traumatic cataract, and posterior segment intraocular foreign body (IOFB). Following anterior segment repair and extraction of traumatic cataract by clear cornea phacoemulsification, a standard 25-gauge transconjunctival pars plana vitrectomy was performed to find and release the IOFB. With active suction using a 25-gauge silicone tipped cannula, the foreign body was retrieved and safely placed in the anterior chamber...
April 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28499054/manual-removal-of-intraocular-lens-silicone-oil-droplets-and-dystrophic-calcifications-using-a-nitinol-loop-a-case-series
#5
Kareem Moussa, Theodore Leng, Julius T Oatts, Robert B Bhisitkul, David G Hwang, Jay M Stewart
Deposition of dystrophic calcifications on the posterior surface of silicone intraocular lenses (IOLs) has been reported in patients with asteroid hyalosis. Accumulation of silicone oil droplets on the posterior surface of silicone IOLs in silicone-filled eyes has also been reported. Recently, a novel technique to manually remove dystrophic calcifications using a nickel titanium loop (Finesse Flex Loop; Alcon, Fort Worth, TX) was described, obviating the need for IOL exchange. Here, the authors report their outcomes with this technique in five eyes with IOL dystrophic calcifications as well as one eye with IOL silicone oil droplet accumulation...
May 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28487797/echographic-evaluation-of-a-subconjunctival-cystic-lesion
#6
Maddalena De Bernardo, Gennarfrancesco Iaccarino, Valeria Russo, Nicola Rosa
Migration of intraocular silicone oil, used in the treatment of complicated retinal detachment, has been rarely described, but when it happens it can arise with a differential diagnosis with scleral buckling extrusion, tumor, dermoid, ocular cysticercosis, and abscess. The presence of silicone oil in the eye gives very ugly echographic pictures, but these kinds of pictures can be very useful in making a differential diagnosis in the above-mentioned cases. A 39-year-old white female complained of the presence of conjunctival hyperemia and tearing in the right eye (RE); her visual acuity was hand motion, and the intraocular pressure was 14 mmHg...
2017: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/28445869/silicone-oil-related-visual-loss
#7
Hamouda Hamdy Ghoraba, Adel Galal Zaky, Mohamed Amin Heikal, Emad Eldin Mohamed Elgemai, Haithem Mamoun Abd Al Fatah
BACKGROUND: Silicone oil (SO) is used as an intravitreal tamponade agent in vitreoretinal surgery for rhegmatogenous retinal detachment (RRD) complicated by proliferative vitreoretinopathy or with large, multiple retinal tears. Usually, SO is left in the eye for at least 3 months. Although its use can lead to well-known complications, intraocular SO is generally well tolerated. Some studies have reported unexpected central vision loss after SO use or removal. OBJECTIVE: To investigate and analyze the reason for visual loss after the use or removal of intraocular SO in patients who underwent vitrectomy surgeries for RRD...
April 27, 2017: Ophthalmologica. Journal International D'ophtalmologie
https://www.readbyqxmd.com/read/28441071/efficacy-and-safety-of-23-gauge-pars-plana-vitrectomy-silicone-oil-tamponade-combination-for-treatment-of-pediatric-post-traumatic-endophthalmitis
#8
Wei Jin, Yaopeng Xu, Wenjun Wang, Yiqiao Xing, Anhuai Yang
PURPOSE: To determine (i) the etiology, epidemiology, mechanism of injury, and risk factors associated with open globe injuries (OGIs) in children and (ii) visual outcomes of pediatric patients with post-traumatic endophthalmitis following 23-gauge pars plana vitrectomy (PPV) combined with silicone oil tamponade (SOT). METHODS: A total of 107 consecutive patients, <15 years of age, who had been diagnosed with post-traumatic endophthalmitis between September 2009 and October 2015, were included in this 6-year retrospective study...
April 25, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28393030/surgical-treatment-and-visual-outcomes-of-cataract-with-persistent-hyperplastic-primary-vitreous
#9
Li Li, Da-Bei Fan, Ya-Ting Zhao, Yun Li, Fang-Fei Cai, Guang-Ying Zheng
AIM: To evaluate the surgical treatment and visual outcomes of eyes with cataract and persistent hyperplastic primary vitreous (PHPV). METHODS: This retrospective study included patients with cataract and PHPV treated with various strategies. Anterior PHPV was treated using phacoemulsification with underwater electric coagulation on posterior capsule neovascularization, posterior capsulotomy, anterior vitrectomy, and intraocular lens (IOL) implantation. Posterior PHPV was treated with lensectomy, posterior vitrectomy, retinal photocoagulation, and IOL implantation or silicone oil tamponade...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28302249/opacification-of-a-hydrophilic-acrylic-intraocular-lens
#10
Yezhen Yang, Manqiang Peng, Yiqin Duan, Xuetao Huang, Kuanshu Li, Ding Lin
Opacification of a hydrophilic acrylic intraocular (IOL) lens is a rare phenomenon. We herein report a case of a 57-year man complaining of decreased vision at left eye for the last 4 months. He had undergone phacoemulsification with IOL implantation 2 years back. IOL opacification was observed through slit-lamp. IOL exchange was carried out. The exchanged IOL and a new lens of the same model were sent to laboratory for pathologic analysis. Confocal microscopy showed uniformly distributed granules from the surface to 80 µm internal surface...
March 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28003789/an-after-after-cataract-a-curious-case-of-visual-axis-re-opacification
#11
Jay Kalliath, Gaurav Prakash, Kavitha Avadhani, Anitha Shakuntala
Posterior capsular opacification (PCO) is common after cataract surgery. Recurrence is very rare after a successful Yttrium aluminium-garnet (YAG) capsulotomy in adults. We report a case of visual axis re-opacification after a successful YAG capsulotomy for PCO in an adult. A 60-year male underwent phacoemulsification with +20.0 D acrylic hydrophobic intraocular lens implantation and silicon oil removal (SOR) five months after a successful retinal detachment repair. He underwent a capsulotomy after two months of surgery; however, the visual axis re-opacified after three more months...
October 2016: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/27999127/bilateral-choroidal-detachment-with-exudative-retinal-detachment-in-a-patient-with-septicaemia
#12
Padmaja Kumari Rani, Vikas Ambiya, Sirisha Senthil, Subhadra Jalali
We present a case of bilateral choroidal and exudative retinal detachment with hypotony in a patient with septicaemia. Our patient after initial hospitalisation was treated by the local ophthalmologist as a case of sterile pan uveitis with systemic and topical steroids that did not have any effect. Our patient responded well to timely surgical intervention of choroidal drainage and vitrectomy with silicone oil tamponade followed by steroids and antibiotics. Cataract progression in both eyes occurred due to hypotony, inflammation, use of steroids and the vitreous surgery...
December 20, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/27843234/progressive-keratoconus-retinal-detachment-and-intracorneal-silicone-oil-with-obsessive-compulsive-eye-rubbing
#13
Kartik Panikkar, George Manayath, Revathi Rajaraman, Veerappan Saravanan
An 18-year-old boy with an obsessive-compulsive disorder of eye rubbing presented with forme fruste keratoconus (KC) and posterior subcapsular cataracts. After evaluation, he underwent phacoemulsification in his left eye with intraocular lens implantation. The aggressive eye rubbing, however, aggravated the rapid progression to established KC, and further acute corneal hydrops within 3 months. Within the next 3 months, the eye rubbing precipitated rhegmatogenous retinal detachments (RDs) in both eyes. Furthermore, after undergoing a combined cataract and RD surgery with belt buckling and silicone oil endotamponade in his right eye, the repeated eye rubbing caused extrusion of the implanted silicone oil into the subconjunctival space and within the corneal stroma...
September 2016: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/27738893/imaging-characteristics-of-the-postoperative-globe-a-pictorial-essay
#14
REVIEW
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...
December 2016: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/27526710/refractive-shift-of-silicone-oil-tamponade-in-pseudophakic-eye
#15
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...
August 16, 2016: BMC Ophthalmology
https://www.readbyqxmd.com/read/27494778/surgical-treatment-of-subretinal-fibrosis-caused-macular-detachment-in-vogt-koyanagi-harada-disease-a-pioneer-study
#16
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
https://www.readbyqxmd.com/read/27494772/chitosan-alginate-based-multilayers-to-control-drug-release-from-ophthalmic-lens
#17
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
https://www.readbyqxmd.com/read/27492107/evaluation-of-long-term-biocompatibility-and-capsular-bag-opacification-with-a-new-silicone-polyimide-plate-type-intraocular-lens-in-the-rabbit-model
#18
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
https://www.readbyqxmd.com/read/27468037/intraocular-silicone-ball-implantation-after-evisceration-in-a-slow-loris-nycticebus-coucang
#19
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
https://www.readbyqxmd.com/read/27439781/clinical-and-microbiological-profile-of-non-tuberculous-mycobacterial-endophthalmitis-experience-in-a-tertiary-eye-care-centre-in-southern-india
#20
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
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