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https://www.readbyqxmd.com/read/29155782/partial-optic-nerve-transection-in-rats-a-model-established-with-a-new-operative-approach-to-assess-secondary-degeneration-of-retinal-ganglion-cells
#1
Fancheng Yan, Sailiang Guo, Yijie Chai, Lan Zhang, Kegao Liu, Qingjun Lu, Ningli Wang, Shuning Li
Previous studies have shown that the secondary degeneration of retinal ganglion cells (RGCs) occurs commonly in glaucoma. Partial optic nerve transection is considered a useful and reproducible model. Compared with other optic nerve injury models used commonly for assessing secondary degeneration, e.g. complete optic nerve transection and optic nerve crush models, the partial optic nerve transection model is superior as it distinguishes primary from secondary degeneration in situ. Therefore, it serves as an excellent tool for evaluating secondary degeneration...
October 15, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29148158/long-term-anesthetic-protocol-in-rats-feasibility-in-electrophysiology-studies-in-visual-prosthesis
#2
Alejandro Barriga-Rivera, Veronica Tatarinoff, Nigel H Lovell, John W Morley, Gregg J Suaning
Electrical stimulation of excitable cells provides therapeutic benefits for a variety of medical conditions, including restoration of partial vision to those blinded via some types of retinal degeneration. To improve visual percepts elicited by the current technology, researchers are conducting acute electrophysiology experiments, mainly in cats. However, the rat can provide a model of a range of retinal diseases and possesses a sufficiently large eye to be used in this field. This article presents a long-term anesthetic protocol to enable electrophysiology experiments to further the development of visual prostheses...
November 17, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/29135814/neuro-ophthalmology-at-a-tertiary-eye-care-centre-in-india
#3
Rebika Dhiman, Digvijay Singh, Shiva P Gantayala, Vaitheeswaran L Ganesan, Pradeep Sharma, Rohit Saxena
BACKGROUND: Neuro-ophthalmology as a specialty is underdeveloped in India. The aim of our study was to determine the spectrum and profile of patients presenting to a tertiary eye care center with neuro-ophthalmic disorders. METHODS: A retrospective hospital-based study was conducted, and records of all patients seen at the neuro-ophthalmology clinic of Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India, over a 1-year period were retrieved and evaluated...
November 9, 2017: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/29130647/randomized-controlled-trial-of-electro-stimulation-therapies-to-modulate-retinal-blood-flow-and-visual-function-in-retinitis-pigmentosa
#4
Ava K Bittner, Kenneth Seger, Rachel Salveson, Samantha Kayser, Natalia Morrison, Patricia Vargas, Deborah Mendelsohn, Jorge Han, Hua Bi, Gislin Dagnelie, Alexandra Benavente, Jessica Ramella-Roman
PURPOSE: We examined changes in visual function and ocular and retinal blood flow (RBF) among retinitis pigmentosa (RP) participants in a randomized controlled trial of electro-stimulation therapies. METHODS: Twenty-one RP participants were randomized (1:1:1) to transcorneal electrical stimulation (TES) at 6 weekly half-hour sessions, electro-acupuncture or inactive laser acupuncture (sham control) at 10 half-hour sessions over 2 weeks. Early Treatment of Diabetic Retinopathy Study (ETDRS) visual acuity (VA), quick contrast sensitivity function, Goldmann visual fields, AdaptDx scotopic sensitivity, spectral flow and colour Doppler imaging of the central retinal artery (CRA), and RBF in macular capillaries were measured twice pre-treatment, after 2 TES sessions, within a week and a month after intervention completion...
November 11, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29121356/pain-associated-with-a-subconjunctival-cefazolin-lidocaine-mixture-in-retinal-surgery-a-randomized-control-trial
#5
Michael Y K Mak, Peng Yan, Jonathan Park, Lavnish Joshi, Daniel Warder, Cassandra Lee, Husayn Gulamhusein, Robert G Devenyi, Wai-Ching Lam
BACKGROUND AND OBJECTIVE: The purpose of this randomized, single-masked clinical trial is to explore whether cefazolin mixed with 2% lidocaine can reduce pain. PATIENTS AND METHODS: Patients naïve to ophthalmic surgery were randomized to subconjunctival injection of either a 0.5 mL cefazolin-balanced salt solution (0.3 mL cefazolin and 0.2 mL balanced salt solution) or 0.5 mL cefazolin-lidocaine solution (0.3 mL cefazolin and 0.2 mL 2% lidocaine) during retinal surgery with a retrobulbar block...
November 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29120977/use-of-a-scan-ultrasound-and-optical-coherence-tomography-to-differentiate-papilledema-from-pseudopapilledema
#6
Roberto Saenz, Han Cheng, Thomas C Prager, Laura J Frishman, Rosa A Tang
SIGNIFICANCE: Differentiating papilledema from pseudopapilledema reflecting tilted/crowded optic discs or disc drusen is critical but can be challenging. Our study suggests that spectral-domain optical coherence tomography (OCT) peripapillary retinal nerve fiber layer thickness and retrobulbar optic nerve sheath diameter (ONSD) measured by A-scan ultrasound provide useful information when differentiating the two conditions. PURPOSE: To evaluate the use of A-scan ultrasound and spectral-domain OCT retinal nerve fiber layer thickness (RNFLT) in differentiating papilledema associated with idiopathic intracranial hypertension from pseudopapilledema...
November 9, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29118516/retrobulbar-alcohol-injection-for-phantom-eye-pain-syndrome-in-bilateral-eviscerated-orbit
#7
Venkatakrishnan V Jaichandran, Srinivasan Bhaskar
No abstract text is available yet for this article.
September 2017: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/29095826/pediatric-orbital-wall-fractures-prognostic-factors-of-diplopia-and-ocular-motility-limitation
#8
Yung Ju Yoo, Hee Kyung Yang, Namju Kim, Jeong-Min Hwang
OBJECTIVES: To investigate the factors affecting recovery of diplopia and limited ocular motility in pediatric patients who underwent surgery for orbital wall fracture. DESIGN: Retrospective observational case series. METHODS: In this retrospective observational case series, 150 pediatric patients (1-18 years old) who were diagnosed with orbital medial wall or floor fracture and underwent corrective surgery between 2004 and 2016 at Seoul National University Bundang Hospital were included...
2017: PloS One
https://www.readbyqxmd.com/read/29067510/ct-guided-percutaneous-sclerotherapy-for-low-flow-retrobulbar-intraconal-venous-malformations
#9
Biao Yang, Jian Zhao, Ling Gao, Chun-Lin Li, Xing-Rong Liu, He Jiao, Zheng-Yin Liao, Cheng Yi
BACKGROUND AND AIMS: Until now, no study has focused exclusively on low-flow retrobulbar intraconal venous malformations (RIVMs) which may require treatment due to cosmetic defect, pain, and visual dysfunction. The treatment for RIVMs which surround the optic nerve remains challenging. This case series aimed to evaluate the technical feasibility, effectiveness, and safety of percutaneous sclerotherapy with polidocanol for low-flow RIVMs, using local anesthesia. METHOD: This is a prospective, non-comparative, single-center, interventional case series...
October 24, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/29060082/retinal-electrostimulation-in-rats-activation-thresholds-from-superior-colliculus-and-visual-cortex-recordings
#10
Alejandro Barriga-Rivera, Tianruo Guo, John W Morley, Nigel H Lovell, Gregg J Suaning
Retinal neuromodulation is an emerging therapeutic approach to restore functional vision to those suffering retinal photoreceptor degeneration. The retina encodes visual information and transmits it to the brain. Replicating this retinal code through electrical stimulation is essential to improving the performance of visual prostheses. In doing so, the first step relies on precise neural recordings from visual centers that allow studying the response of these neurons to electrical stimulation of the retina...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29050924/-progression-of-nerve-fiber-layer-defects-in-retrobulbar-optic-neuritis-by-the-macular-ganglion-cell-complex
#11
D Hong, C Bosc, F Chiambaretta
INTRODUCTION: Recent studies with SD OCT had shown early axonal damage to the macular ganglion cell complex (which consists of the three innermost layers of the retina: Inner Plexiform Layer [IPL], Ganglion Cell Layer [GCL], Retinal Nerve Fibre layer [RNFL]) in optic nerve pathology. Retrobulbar optic neuritis (RBON), occurring frequently in demyelinating diseases, leads to atrophy of the optic nerve fibers at the level of the ganglion cell axons, previously described in the literature...
November 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29035655/focal-uterine-t-cell-lymphoma-in-an-ovariectomized-cat
#12
Bérénice Conversy, Anne-Laure Freulon, Mélanie Graille
CASE DESCRIPTION A 14-year-old ovariectomized domestic shorthair cat was evaluated because of periuria and perineal licking of 3 days' duration. CLINICAL FINDINGS On initial examination, an abdominal mass was palpable cranial to the urinary bladder. The perineal area was soiled with a blood-tinged mucous fluid. Abdominal ultrasonography revealed a vascularized, focal, and circumferential thickening of the right uterine horn, involving particularly the muscular layer. No evidence of dissemination was noted. TREATMENT AND OUTCOME Hysterectomy was performed, revealing a localized, 2...
November 1, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/29022955/demographic-pattern-and-clinical-characteristics-of-optic-neuritis-in-a-tertiary-eye-care-centre
#13
Manita Sunam Godar, Ananda Kumar Sharma, Madhu Thapa, Sanjeeta Sitaula, Shanti Gurung
PURPOSE: To study the demographic pattern and clinical characteristics of optic neuritis cases in a tertiary eye care centre in Nepal. DESIGN: Descriptive, cross-sectional study. METHODOLOGY: Complete ocular examination was done in all the newly diagnosed cases of optic neuritis presenting from January 1st 2012 to June 30th 2013. Demographic pattern, clinical features, visual acuity, colour vision, contrast sensitivity and visual field defects were studied...
January 2017: Nepalese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29018755/vertical-diplopia-after-cataract-surgery-overacting-and-or-underacting-extraocular-muscle
#14
Bing-Herng Shen
The purpose of this study was to demonstrate two cases of vertical diplopia after cataract surgery and to discuss the mechanism and types of strabismus caused by the local anesthesia with retrobulbar injection. Two cases of vertical diplopia after cataract surgeries were reported. They were operated by the same surgeon and both happened to the left eye and both presented with marked left hypotropia. The clinical findings consisted of overacting left inferior rectus (LIR) in case 1 and mixed overacting and restrictive LIR in case 2...
January 2017: Taiwan Journal of Ophthalmology
https://www.readbyqxmd.com/read/28991108/patient-harm-in-cataract-surgery-a-series-of-adverse-events-in-massachusetts
#15
Sarah A Roberto, Joseph Bayes, Paul E Karner, Michael G Morley, Karen C Nanji
Massachusetts state agencies received reports of 37 adverse events (AEs) involving cataract surgery from 2011 to 2015. Fifteen were anesthesia related, including 5 wrong eye blocks, 3 cases of hemodynamic instability, 2 retrobulbar hematoma/hemorrhages, and 5 globe perforations resulting in permanent loss of vision. While Massachusetts' reported AEs likely underrepresent the true number of AEs that occur during cataract surgery, they do offer useful signal data to indicate the types of patient harm occurring during these procedures...
October 5, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28985811/ocular-injury-in-orbital-fractures-at-a-level-i-trauma-center
#16
Michael Ross, Christian El-Haddad, Jean Deschênes
OBJECTIVE: To determine the acuity of ophthalmology referral for orbital fractures. METHODS: This is a retrospective chart review of 73 cases of orbital fractures over a 1-year period at a level I trauma centre. All consultations including those for orbital fractures were included in the study. The age and sex of the patient, date and time of initial emergency room (ER) arrival, date and time of input of the ophthalmology consultation, date and time the patient actually saw ophthalmology, reasons for consultation, location of examination, mechanism, and ocular findings at initial and follow-up examination, and any orbital surgery performed were recorded...
October 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28973374/effects-of-intravitreal-dexamethasone-implants-on-retinal-oxygen-saturation-vessel-diameter-and-retrobulbar-blood-flow-velocity-in-me-secondary-to-rvo
#17
Katharina Eibenberger, Leopold Schmetterer, Sandra Rezar-Dreindl, Piotr Wozniak, Reinhard Told, Georgios Mylonas, Christoph Krall, Ursula Schmidt-Erfurth, Stefan Sacu
Purpose: To investigate the effects of intravitreal 0.7 mg dexamethasone implants (Ozurdex) on arterial and venous oxygen saturation, retinal vessel diameter, and retrobulbar blood flow velocity in patients with macular edema (ME) due to retinal vein occlusion (RVO). Methods: This prospective, nonrandomized clinical trial included 40 eyes of 40 patients with ME due to RVO. Measurements of arterial and venous oxygen saturation and retinal vessel diameters were performed using the Dynamic Vessel Analyzer...
October 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28962603/assessment-of-intracranial-pressure-with-ultrasonographic-retrobulbar-optic-nerve-sheath-diameter-measurement
#18
Dachuan Liu, Zhen Li, Xuxiang Zhang, Liping Zhao, Jianping Jia, Fei Sun, Yaxing Wang, Daqing Ma, Wenbin Wei
BACKGROUND: Ultrasonograpic retrobulbar optic nerve sheath diameter (ONSD) measurement is considered to be an alternative noninvasive method to estimate intracranial pressure,but the further validation is urgently needed. The aim of the current study was to investigate the association of the ultrasonographic ONSD and intracranial pressure (ICP) in patients. METHODS: One hundred and ten patients whose intracranial pressure measured via lumbar puncture were enrolled in the study...
September 29, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28944317/comparison-of-regional-vs-general-anesthesia-for-surgical-repair-of-open-globe-injuries-at-a-university-referral-center
#19
Andrew J McClellan, Jacquelyn J Daubert, Nidhi Relhan, Kimberly D Tran, Harry W Flynn, Steven Gayer
PURPOSE: This study compares the clinical features and physician selection of either Regional Anesthesia (peribulbar or retrobulbar block) with Monitored Anesthesia Care (RA-MAC) or General Anesthesia (GA) for open globe injury repair. DESIGN: A non-randomized, comparative, retrospective case series at a University Referral Center. PARTICIPANTS: All adult repairable open globe injuries receiving primary repair between January 1st, 2004 and December 31st, 2014 (11 years)...
May 2017: Ophthalmology retina
https://www.readbyqxmd.com/read/28937286/comparing-subjective-and-objective-image-quality-at-two-different-radiation-exposure-ranges-of-the-paranasal-sinus-ct-examinations-using-a-volumetric-320-row-detector-ct-system
#20
Berhan Pirimoglu, Recep Sade, Muhammed Sedat Sakat, Hayri Ogul, Suat Eren, Mecit Kantarci
OBJECTIVES: To evaluate image quality of protocol including 135 kVp, 5 mAs and 80 kVp, 5 mAs in the paranasal sinus CT examinations using single volumetric 320-row multidetector CT technique. METHODS: From September to December 2016, both of our control group including 135 kVp and 5 mAs and our study group including 80 kVp and 5 mAs paranasal CT protocols were simultaneously performed on 40 patients using single volumetric 320-row multidetector CT device. Image quality for bony structures, air-filled structures and soft tissues were independently assessed for each group by three blinded observers using a 3-point grading scale (0 = not diagnostic, 1 = partially diagnostic, 2 = diagnostic)...
December 2017: Dento Maxillo Facial Radiology
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