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Retina and vitreous

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https://www.readbyqxmd.com/read/28209509/the-raptor-visual-system-an-update
#1
J González-Martín-Moro, J L Hernández-Verdejo, A Clement-Corral
OBJECTIVE: Diurnal birds of prey (raptors) are considered the group of animals with highest visual acuity (VA). The purpose of this work is to review all the information recently published about the visual system of this group of animals. MATERIAL AND METHODS: A bibliographic search was performed in PubMed. The algorithm used was (raptor OR falcon OR kestrel OR hawk OR eagle) AND (vision OR «visual acuity» OR eye OR macula OR retina OR fovea OR «nictitating membrane» OR «chromatic vision» OR ultraviolet)...
February 13, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28195618/preclinical-acute-ocular-safety-study-of-combined-intravitreal-carboplatin-and-etoposide-phosphate-for-retinoblastoma
#2
Brian G Mohney, Victor M Elner, Andrew B Smith, J William Harbour, Brian D Smith, David C Musch, Stephen J Smith
BACKGROUND AND OBJECTIVE: To describe the ocular toxicity of intravitreal carboplatin and etoposide phosphate (VP16P) in Dutch-Belted rabbits. MATERIALS AND METHODS: Twenty-two adult male Dutch-Belted rabbits (Cohort 1) each received a single, bilateral intravitreal injection (0.05 mL). For Cohort 1, safety was assessed via electroretinograms (ERGs) and ocular examination. Of nine total groups in Cohort 1, the first five received the following single agents: Group 1: normal saline; Group 2: VP16P 75 µg; Group 3: VP16P 100 µg; Group 4: carboplatin 4 µg; and Group 5: carboplatin 8 µg...
February 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28195617/pediatric-traumatic-retinal-detachments-clinical-characteristics-and-outcomes
#3
Sabahattin Sul, Gökhan Gurelik, Safak Korkmaz, Sengül Ozdek, Berati Hasanreisoglu
BACKGROUND AND OBJECTIVE: To compare clinical characteristics and surgical outcomes of retinal detachment (RD) after open globe injuries (OGIs) and closed globe injuries (CGIs). PATIENTS AND METHODS: One hundred ten eyes of 110 patients aged 17 years or younger who underwent primary RD repair after OGI and CGI between 2010 and 2013 were reviewed retrospectively. RESULTS: Cataract (59.8% vs. 21.7%; P = .002) and vitreous hemorrhage (54% vs...
February 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28195616/clinical-features-and-management-of-subretinal-abscesses-secondary-to-methicillin-resistant-staphylococcus-aureus-endogenous-endophthalmitis
#4
Jorge Fortun, Yasha S Modi, Angela Bessette, Jordan Heffez, Petros Carvounis, Daniel S Petkovsek, Nicholas G Anderson, Daniel Martin, Sunil Srivastava
BACKGROUND AND OBJECTIVE: To describe the clinical features, management, and immediate outcomes of patients with subretinal abscesses secondary to methicillin-resistant Staphylococcus aureus (MRSA) endogenous endophthalmitis. PATIENTS AND METHODS: Eleven eyes of seven patients were identified by retrospective chart review. Demographics, initial presentation, examination findings, imaging, cultures, treatments, and short-term outcomes were reviewed. RESULTS: Eleven eyes of seven patients presented with subretinal abscesses secondary to MRSA endogenous endophthalmitis...
February 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28179694/functional-and-anatomical-outcome-in-closed-globe-combat-ocular-injuries
#5
Qamar Ul Islam, Mazhar Ishaq, Amer Yaqub, Muhammad Kamran Saeed
OBJECTIVE: To analyse the pattern, visual and anatomical outcome of closed globe combat-related ocular injuries sustained by troops. METHODS: This retrospective study was conducted at Armed Forces Institute of Ophthalmology, Rawalpindi, Pakistan, and comprised patients with ocular injuries from January 2010 to June 2014. Record of each patient was evaluated and demography, mode and type of injury, initial and final visual acuity, associated globe injuries, concomitant non-ocular injuries, type of surgical procedures and complications were endorsed on a pre-devised proforma...
December 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28162200/-the-protective-effect-of-human-umbilical-cord-mesenchymal-stem-cells-induced-neural-stem-cells-in-the-vitreous-on-the-blood-retinal-barrier-in-diabetic-rats
#6
M Dong, W Zhang, S Chen, J M Wang, H T Duan, J H Kong, Y X Wang, X Bi, J Song
Objective: To investigate the effect of intravitreal injection of neural stem cells (NSC) induced from human umbilical cord mesenchymal stem cells, and to provide a theoretical basis for the clinical treatment of blood-retinal barrier damage due to diabetic retinopathy (DR). Methods: Experimental study. Sixty male Sprague-Dawley rats were randomly divided into control group, DR group and NSC group. Diabetic rats were induced by injection of streptozotocin, and the control rats were injected with an equal volume of solvent...
January 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28152535/the-blood-retinal-barrier-in-the-management-of-retinal-disease-euretina-award-lecture
#7
José Cunha-Vaz
Retinal diseases are the main causes of blindness in the Western world. Diabetic retinopathy and age-related macular degeneration continue to increase in prevalence and as main causes of vision loss. Intravitreal anti-VEGF and steroid injections have raised new expectations for their successful treatment. These agents act by stabilizing the blood-retinal barrier (BRB). Our group defined the BRB by identifying for the first time the tight junctions that unite retinal endothelial cells and are the basis for the inner BRB, an observation later confirmed in retinal pigment epithelial cells and in brain vessels...
February 3, 2017: Ophthalmologica. Journal International D'ophtalmologie
https://www.readbyqxmd.com/read/28149770/comparison-of-lens-oxidative-damage-induced-by-vitrectomy-and-or-hyperoxia-in-rabbits
#8
Hong Yan, Dan Wang, Tian-Bing Ding, Hai-Yan Zhou, Wei-Jia Yan, Xin-Chuan Wang
AIM: To compare of lens oxidative damage induced by vitrectomy and/or hyperoxia in rabbit. METHODS: Sixteen New Zealand rabbits (2.4-2.5 kg) were randomly divided into two groups (Group A, n=12; Group B, n=4). In Group A, the right eyes were treated with vitrectomy and systemic hyperoxia (oxygen concentration: 80%-85%, 1 ATA, 4h/d) (Group A-right), and the left eyes were treated with hyperoxia without vitrectomy surgery (Group A-left). Four rabbits in group B (eight eyes) were untreated as the controls...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28146368/roles-of-il-6-in-ocular-inflammation-a-review
#9
Hassan Ghasemi
PURPOSE: This review represents the current in vitro, in vivo animal and human researches on the roles of IL-6 in inflammatory ocular disorders. Data sources were literature reviewed using PubMed, Medline, and ISI Databases (since 1981 to late 2016). Search items included interleukine-6 (IL-6); chemokine; cytokine, alone or in combination with serum, aqueous, vitreous, eye, ocular, ophthalmic, and review. RESULTS: IL-6 is found to be involved in ocular inflammation...
February 1, 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/28138561/cd44-expression-in-endothelial-colony-forming-cells-regulates-neurovascular-trophic-effect
#10
Susumu Sakimoto, Valentina Marchetti, Edith Aguilar, Kelsey Lee, Yoshihiko Usui, Salome Murinello, Felicitas Bucher, Jennifer K Trombley, Regis Fallon, Ravenska Wagey, Carrie Peters, Elizabeth L Scheppke, Peter D Westenskow, Martin Friedlander
Vascular abnormalities are a common component of eye diseases that often lead to vision loss. Vaso-obliteration is associated with inherited retinal degenerations, since photoreceptor atrophy lowers local metabolic demands and vascular support to those regions is no longer required. Given the degree of neurovascular crosstalk in the retina, it may be possible to use one cell type to rescue another cell type in the face of severe stress, such as hypoxia or genetically encoded cell-specific degenerations. Here, we show that intravitreally injected human endothelial colony-forming cells (ECFCs) that can be isolated and differentiated from cord blood in xeno-free media collect in the vitreous cavity and rescue vaso-obliteration and neurodegeneration in animal models of retinal disease...
January 26, 2017: JCI Insight
https://www.readbyqxmd.com/read/28129123/improved-intravitreal-aav-mediated-inner-retinal-gene-transduction-after-surgical-internal-limiting-membrane-peeling-in-cynomolgus-monkeys
#11
Kazuhisa Takahashi, Tsutomu Igarashi, Koichi Miyake, Maika Kobayashi, Chiemi Yaguchi, Osamu Iijima, Yoshiyuki Yamazaki, Yuko Katakai, Noriko Miyake, Shuhei Kameya, Takashi Shimada, Hiroshi Takahashi, Takashi Okada
The retina is an ideal target for gene therapy because of its easy accessibility and limited immunological response. We previously reported that intravitreally injected adeno-associated virus (AAV) vector transduced the inner retina with high efficiency in a rodent model. In large animals, however, the efficiency of retinal transduction was low, because the vitreous and internal limiting membrane (ILM) acted as barriers to transduction. To overcome these barriers in cynomolgus monkeys, we performed vitrectomy (VIT) and ILM peeling before AAV vector injection...
January 4, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28114566/the-effects-of-metformin-on-obesity-induced-dysfunctional-retinas
#12
Andy Jeesu Kim, Janet Ya-An Chang, Liheng Shi, Richard Cheng-An Chang, Michael Lee Ko, Gladys Yi-Ping Ko
Purpose: The purpose of this study was to determine the effects of metformin on dysfunctional retinas in obesity-induced type 2 diabetic mice. Methods: A high-fat diet (HFD)-induced diabetic mouse model (C57BL/6J) was used in this study. After 2 months of the HFD regimen, HFD mice were given daily metformin through oral gavage. Body weights, glucose tolerance, and retinal light responses were monitored regularly. Fluorescein angiography (FA) was used to assess changes in retinal vasculature...
January 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28110950/vancomycin-associated-hemorrhagic-occlusive-retinal-vasculitis-clinical-characteristics-of-36-eyes
#13
Andre J Witkin, David F Chang, J Michael Jumper, Steve Charles, Dean Eliott, Richard S Hoffman, Nick Mamalis, Kevin M Miller, Charles C Wykoff
PURPOSE: To expand understanding of presentation, diagnosis, and outcomes of hemorrhagic occlusive retinal vasculitis (HORV). DESIGN: Retrospective case series. PARTICIPANTS: Thirty-six eyes of 23 patients. METHODS: The American Society of Cataract and Refractive Surgery (ASCRS) and the American Society of Retina Specialists (ASRS) formed a joint task force to define clinical characteristics of HORV and to study its prevalence, cause, treatment, and outcomes...
January 19, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28110937/adult-human-retinal-m%C3%A3-ller-glia-display-distinct-peripheral-and-macular-expression-of-cd117-and-cd44-stem-cell-associated-proteins
#14
Lay Khoon Too, Gary Gracie, Enisa Hasic, Julia H Iwakura, Svetlana Cherepanoff
Experimental evidence suggests human Müller glia exhibit neural progenitor properties in vitro. CD117 and CD44 are known to be expressed by stem cells, the survival of which appears to depend critically on interactions with hyaluronan-rich extracellular matrix (ECM). Here, we characterise Müller glia expression of CD117 and CD44 in normal adult human retina and describe how it correlates with hyaluronan distribution in ocular ECM. By using chromogen-based immunohistochemistry, CD117 expression was found in entire Müller glia cytoplasm spanning from inner to outer limiting membrane in both peripheral retina (PR) and macular retina (MR), mirroring expression of the established Müller glia marker vimentin...
January 19, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/28099524/role-of-myo-nog-cells-in-neuroprotection-evidence-from-the-light-damaged-retina
#15
Alice Brandli, Jacquelyn Gerhart, Christopher K Sutera, Sivaraman Purushothuman, Mindy George-Weinstein, Jonathan Stone, Arturo Bravo-Nuevo
PURPOSE: To identify Myo/Nog cells in the adult retina and test their role in protecting retinal photoreceptors from light damage. METHODS: Light damage was induced by exposing albino rats raised in dim cyclic light to 1000 lux light for 24 hours. In one group of rats, Myo/Nog cells were purified from rat brain tissue by magnetic cell sorting following binding of the G8 monoclonal antibody (mAb). These cells were injected into the vitreous humour of the eye within 2 hours following bright light exposure...
2017: PloS One
https://www.readbyqxmd.com/read/28072615/retinal-detachment-associated-with-peripapillary-staphyloma-imaged-with-swept-source-optical-coherence-tomography
#16
Daisuke Kunita, Makoto Inoue, Takashi Koto, Akito Hirakata
PURPOSE: To examine a rhegmatogenous retinal detachment (RRD) associated with a peripapillary staphyloma with swept source optical coherence tomography (SS-OCT) before and after vitrectomy and circumferential photocoagulation. METHODS: The SS-OCT images including the montage images of two patients with a RRD associated with peripapillary staphylomas were analyzed. A 34-year-old woman (Case 1) and a 70-year-old woman (Case 2) both noticed temporal visual field defects in their left eyes...
January 9, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28060400/retinal-detachment-in-a-combined-case-of-stickler-syndrome-and-x-linked-retinoschisis
#17
Neesurg S Mehta, Nicolas A Yannuzzi, Ryan Young, Andrew J McClellan, Sarah P Read, Audina M Berrocal
A 12-year-old boy presented with a total rhegmatogenous retinal detachment and a giant retinal tear in the right eye. Clinical examination, optical coherence tomography, and fundus images showed an optically empty vitreous, lattice degeneration, and retinoschisis of the macula. Genetic testing revealed mutations in the COL2A1 and RS1 genes, confirming a dual diagnosis of Stickler syndrome and X-linked retinoschisis, respectively. This represents the first published account of a patient with both Stickler syndrome and X-linked retinoschisis...
January 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28060394/results-of-peripheral-vitrectomy-under-air-in-rhegmatogenous-retinal-detachment
#18
Tugrul Altan, Kemal Turgay Ozbilen, Turgay Cetin, Ziya Kapran
BACKGROUND AND OBJECTIVE: To evaluate the safety and efficacy of peripheral vitrectomy under air in rhegmatogenous retinal detachment (RRD). PATIENTS AND METHODS: Consecutive patients who underwent 23-gauge pars plana vitrectomy for RRD were included. After removal of core vitreous and drainage of subretinal fluid, peripheral vitreous was removed under air infusion without scleral indentation. Silicone oil or C3F8 gas was used as tamponade. RESULTS: Forty-five eyes of 45 patients were evaluated retrospectively...
January 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28060316/an-alternative-and-validated-injection-method-for-accessing-the-subretinal-space-via-a-transcleral-posterior-approach
#19
Sachin Parikh, Andrew Le, Julian Davenport, Michael B Gorin, Steven Nusinowitz, Anna Matynia
Subretinal injections have been successfully used in both humans and rodents to deliver therapeutic interventions of proteins, viral agents, and cells to the interphotoreceptor/subretinal compartment that has direct exposure to photoreceptors and the retinal pigment epithelium (RPE). Subretinal injections of plasminogen as well as recent preclinical and clinical trials have demonstrated safety and/or efficacy of delivering viral vectors and stem cells to individuals with advanced retinal disease. Mouse models of retinal disease, particularly hereditary retinal dystrophies, are essential for testing these therapies...
December 7, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28058163/clinical-features-and-course-of-patients-with-peripheral-exudative-hemorrhagic-chorioretinopathy
#20
Zafer Cebeci, Yasemin Dere, Şerife Bayraktar, Samuray Tuncer, Nur Kır
OBJECTIVES: To evaluate the clinical characteristics of patients who were followed in our clinic with the diagnosis of peripheral exudative hemorrhagic chorioretinopathy (PEHC). MATERIALS AND METHODS: Medical records of 12 patients who were diagnosed with PEHC in İstanbul University İstanbul Faculty of Medicine, Department of Ophthalmology between July 2006 and June 2014 were reviewed retrospectively. RESULTS: This study included 21 eyes of 12 patients...
October 2016: Turkish Journal of Ophthalmology
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