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Posterior vitreous displacement

Richard Watson, Walt Gray, William E Sponsel, Brian J Lund, Randolph D Glickman, Sylvia L Groth, Matthew A Reilly
PURPOSE: A computational model of the porcine eye was developed to simulate primary blast exposure. This model facilitates understanding of blast-induced injury mechanisms. METHODS: A computational model of the porcine eye was used to simulate the effects of primary blast loading for comparison with experimental findings from shock tube experiments. The eye model was exposed to overpressure-time histories measured during physical experiments. Deformations and mechanical stresses within various ocular tissues were then examined for correlation with pathological findings in the experiments...
August 2015: Translational Vision Science & Technology
Shao Chong Bu, Roel Kuijer, Roelofje J van der Worp, Xiao Rong Li, Johanna M M Hooymans, Leonoor I Los
BACKGROUND: The vitreoretinal interface is the border of the cortical vitreous and the inner surface of the retina. The adhesion of the cortical vitreous to the ILM, namely vitreoretinal adhesion, involves a series of complex molecular adhesion mechanisms and has been considered as an important pathogenic factor in many vitreoretinal diseases. The presence of type VI collagen at the vitreoretinal interface and its possible interaction with collagens and glycoproteins indicates that type VI collagen may contribute to the vitreoretinal adhesion...
2015: PloS One
Derek Nankivil, Bianca Maceo Heilman, Heather Durkee, Fabrice Manns, Klaus Ehrmann, Shawn Kelly, Esdras Arrieta-Quintero, Jean-Marie Parel
PURPOSE: To determine the role of anterior and posterior zonular tension on the optomechanical lens response during accommodation simulation. METHODS: Ten eyes from nine hamadryas baboons (4.9 ± 0.7 years) and 20 eyes from 18 cynomolgus monkeys (5.4 ± 0.3 years) were dissected, leaving the lens, zonules, ciliary body, hyaloid membrane, anterior vitreous, and a segmented scleral rim intact. The lens preparation was mounted in a lens stretcher, and the outer scleral shell was displaced radially in a stepwise fashion...
March 2015: Investigative Ophthalmology & Visual Science
George Trichonas, Peter K Kaiser
Wound construction is critical in microincision vitrectomy surgery. The three main steps in constructing a proper wound include displacing the conjunctiva away from the sclera, flattening the sclera on insertion, and angling the incision. Each one of these steps helps create wounds that will not leak. Misaligning the conjunctiva from the scleral hole prevents a vitreous wick from extending external to the conjunctiva. Flattening the sclera on trocar insertion provides a longer wound cord length, which is less likely to leak, and angling the incision has been proven to seal better in both anterior and posterior segment incisions...
2014: Developments in Ophthalmology
Qi Yu, Kun Liu, Li Su, Xin Xia, Xun Xu
The application of perfluorocarbon liquids has been well acclaimed in vitreoretinal surgery. Its unique physical properties make it an ideal intraoperative tool to improve the efficiency and safety of surgical procedures in complicated cases. The main functions of perfluorocarbon liquids in vitreoretinal surgery include relocating and fixing the detached retina, displacing the subretinal and subchoroidal to fluid anteriorly, revealing proliferative vitreous retinopathy (PVR) for further maneuvers, protecting the macula from exposure to chemicals with potential toxicity, and assisting the removal of foreign body...
2014: BioMed Research International
Xiaoyong Yuan, Hui Song, Xia Hua, Kirk R Wilhelmus, Xin Tang
UNLABELLED: We describe a modified method of sutureless-incision cataract surgery using an ophthalmic viscosurgical device (OVD) to extract a hard lenticular nucleus or mature cataract. After an isosceles trapezoid-shaped sclerocorneal tunnel and a round 7.0 mm diameter capsulorhexis are made, the nucleus is displaced into the anterior chamber. As OVD is injected, the OVD cannula acts as a slide to guide the nucleus out of the eye. Ophthalmic viscosurgical device-assisted sutureless-incision cataract surgery was used in a consecutive series of 182 eyes with a hard nucleus (57 eyes), mature cataract (47 eyes), or both (78 eyes)...
April 2014: Journal of Cataract and Refractive Surgery
Claude Boscher, Ferenc Kuhn
PURPOSE: Anterior proliferative vitreoretinopathy (PVR) is an important cause of persistent or recurrent retinal detachment (RD). Endoscopy provides 360° panoramic viewing of the vitreous cavity and high-magnification viewing of the anterior vitreous base (AVB). This study describes the 'in vivo' anatomy and pathoanatomy of the AVB using an ocular endoscope in RD and anterior PVR. METHODS: An intraoperative analysis of over 2000 consecutive eyes undergoing vitrectomy for RD operated with endoscopy-assisted vitrectomy was performed...
June 2014: Acta Ophthalmologica
Jonathan S Chang, D Wilkin Parke, Harry W Flynn, Avinash Pathengay, Thomas Albini
Two patients experienced unplanned infusion of suprachoroidal 5,000-centistoke silicone oil during vitrectomy surgery. In one patient the oil was surgically removed using an internal incision in the pars plana choroid after external aspiration failed. The oil was expressed from the suprachoroidal space through this opening into the vitreous cavity. Perfluorocarbon liquid was injected over the posterior pole to displace residual suprachoroidal oil into the vitreous cavity, and the oil was then removed via the existing sclerotomy...
November 1, 2013: Ophthalmic Surgery, Lasers & Imaging Retina
Marcia Beatriz Tartarella, Rodrigo Ueno Takahagi, Ana Paula Braga, João Borges Fortes Filho
PURPOSES: To describe ocular features, management of cataract and functional outcomes in patients with persistent fetal vasculature. METHODS: Retrospective, descriptive case series of patients with persistent fetal vasculature. Data were recorded from the Congenital Cataract Section of Federal University of São Paulo, Brazil from 2001 to 2012. All patients were evaluated for sex, age at diagnosis, systemic findings, laterality, age at surgery, and initial and final follow-up visual acuities...
May 2013: Arquivos Brasileiros de Oftalmologia
Wojciech Omulecki, Joanna Bartela, Aleksandra Synder, Dorota Pałenga-Pydyn, Michał Wilczyński
UNLABELLED: In aphakic patients, lack of capsular support or insufficient capsular support require an implantation of an anterior chamber intraocular lens or a sclerally fixated lens. Rigid PMMA (polymethylmetacrylate) anterior chamber intraocular lenses or transscleral intraocular lenses require an incision 6.0-7.0 mm wide. PURPOSE: Of this study was to evaluate anatomic and functional results of a new foldable acrylic anterior chamber intraocular lens (Acri.Lyc 15A, Acritec) through a small incision (2...
2011: Klinika Oczna
Muhammad Usman Saeed, Ruchika Batra, Farhan Qureshi, David Clark
PURPOSE: To report reflux of anti-VEGF drug during intravitreal injections. METHOD: Review of electronic case notes of patients undergoing intra-vitreal anti-VEGF treatments. Prospective data collection was performed with a specific emphasis on presence or absence of reflux. RESULTS: 152 records of 102 eyes were available from an 8-month period. 119 Ranibizumab injections and 33 bevazicumab injections were considered. Reflux was noted in 48 injections (31%)...
November 2011: Seminars in Ophthalmology
Tetsuya Mutoh, Yukihiro Matsumoto, Makoto Chikuda
BACKGROUND: The purpose of this study was to evaluate pars plana vitrectomy (PPV) with phacoemulsification in the vitreous cavity for treatment of complete posterior dislocation of the lens without any damage to the lens capsule. METHODS: We evaluated factors such as cause of dislocation, scleral fixation of an intraocular lens (IOL), preoperative and postoperative visual acuity, corneal endothelial cell density, and intraoperative and postoperative complications...
2011: Clinical Ophthalmology
Soraya Rofagha, Robert B Bhisitkul
PURPOSE OF REVIEW: To evaluate and review the current literature on the management of retained lens material with pars plana vitrectomy (PPV) and lensectomy after complicated cataract surgery. RECENT FINDINGS: Recent studies on retained lens fragments in cataract surgery support early referral to a vitreoretinal specialist, and indicate that visual outcomes are favorable with current vitrectomy and lensectomy techniques. Nearly 83% of patients without preexisting eye disease who undergo PPV achieve visual acuity of 20/40, whereas 5...
March 2011: Current Opinion in Ophthalmology
A P Ermolaev, E A Kravchuk, G A Drozdova
Two-dimensional echographic study was conducted in 54 patients (54 eyes) with terminal glaucoma. Posterior vitreous detachment was found in all the study eyes. Kinetic echographic testing revealed a uniform instantaneous displacement of structures in the vitreal cavity, which indirectly indicates the evenness of pressure distribution in the fluid media of the posterior eye segment in terminal glaucoma.
May 2010: Vestnik Oftalmologii
S Mahmood, H von Lany, M D Cole, S J Charles, C R H James, B Foot, P Gouws, S Shaw
AIMS: To study the epidemiology and risk factors contributing to displacement of nuclear fragments into the vitreous (DNFV) complicating phacoemulsification in the UK. METHODS: Cases were collected prospectively between March 2003 and March 2004 by active surveillance through the British Ophthalmological Surveillance Unit (BOSU). Case-control analysis of risk factors was performed by visiting 10 randomly selected centres using a total of 521 cases of uncomplicated phacoemulsification...
April 2008: British Journal of Ophthalmology
Antonia M Joussen, Bernd Kirchhof, Norbert Schrage, Christina Ocklenburg, Ralf-Dieter Hilgers
PURPOSE: Proliferative vitreoretinopathy (PVR) is the most important reason for blindness following retinal detachment. Presently, vitreous tamponades such as gas or silicone oil cannot contact the lower part of the retina. A heavier-than-water tamponade displaces the inflammatory and PVR-stimulating environment from the inferior area of the retina. The Heavy Silicone Oil versus Standard Silicone Oil Study (HSO Study) is designed to answer the question of whether a heavier-than-water tamponade improves the prognosis of eyes with PVR of the lower retina...
September 2007: Acta Ophthalmologica Scandinavica
Cheng-Jong Chang, Shang-Yi Chiang, Ching-Long Chen, Teng-Yi Wang
PURPOSE: To investigate the efficacy of sutureless pars plana vitrectomy (PPV) combined with intracameral triamcinolone stain in the management of vitreous loss associated with phacoemulsification. SETTING: Department of Ophthalmology, Tri-Service General Hospital, Taipei, Taiwan, Republic of China. METHODS: This retrospective review comprised the charts of 21 patients who had sutureless PPV combined with intracameral triamcinolone stain to manage vitreous loss resulting from posterior capsule rupture during phacoemulsification...
December 2006: Journal of Cataract and Refractive Surgery
Joel D Stitzel, Stefan M Duma, Joseph M Cormier, Ian P Herring
Over 2.4 million eye injuries occur each year in the US, with over 30,000 patients left blind as a result of the trauma. The majority of these injuries occur in automobile crashes, military operations and sporting activities. This paper presents a nonlinear finite element model of the eye and the results of 22 experiments using human eyes to validate for globe rupture injury prediction. The model of the human eye consists of the cornea, sclera, lens, ciliary body, zonules, aqueous humor and vitreous body. Lagrangian membrane elements are used for the cornea and sclera, Lagrangian bricks for the lens, ciliary, and zonules, and Eulerian brick elements comprise the aqueous and vitreous...
November 2002: Stapp Car Crash Journal
Ricardo A Pontes de Carvalho, Melissa L Krausse, A Linn Murphree, Edward E Schmitt, Peter A Campochiaro, Irene H Maumenee
PURPOSE: To assess the impact of an episcleral exoplant on transscleral delivery. METHODS: New Zealand White rabbits were given a periocular injection of sodium fluorescein (fluorescein, 376 Da) or an episcleral exoplant loaded with fluorescein. Two types of exoplants were tested: (1) a rigid polyethylene device, impermeable on one side and open to the sclera on the other, that contained compressed pellets of fluorescein and was sutured loosely (apposition group) or tightly to indent the sclera (indentation group) and (2) flexible refillable silicone exoplants also open to the sclera that were secured by suturing, to form a sealed episcleral chamber that was filled with a fluorescein solution...
October 2006: Investigative Ophthalmology & Visual Science
Cristiano Oliveira, Jeffrey M Liebmann, Jack M Dodick, Harvey Topilow, Robert Cykiert, Robert Ritch
PURPOSE: To describe the use of ultrasound biomicroscopy (UBM) to image retained nuclear fragments posterior to the iris plane after uncomplicated phacoemulsification with posterior chamber intraocular lens (PCIOL) implantation in two patients. DESIGN: Interventional case report. METHODS: Two patients presented with an iris elevation after uncomplicated phacoemulsification and lens implantation. RESULTS: Visual acuity was 20/20 in the first patient and 20/30 in the second...
May 2006: American Journal of Ophthalmology
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