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Descemet's membrane

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https://www.readbyqxmd.com/read/28350625/outcome-and-histopathology-of-secondary-penetrating-keratoplasty-graft-failure-managed-by-descemet-membrane-endothelial-keratoplasty
#1
Itay Lavy, Vasilios S Liarakos, Robert M Verdijk, Jack Parker, Thomas M Müller, Marieke Bruinsma, Perry S Binder, Gerrit R J Melles
PURPOSE: To describe the clinical outcome and histopathology of Descemet membrane endothelial keratoplasty (DMEK) performed for secondary graft failure after penetrating keratoplasty (PK). METHODS: A total of 11 eyes from 10 patients who underwent DMEK for secondary PK graft failure at a tertiary referral center were included in this retrospective study. Best-corrected visual acuity, endothelial cell density, and central pachymetry were evaluated before and at regular time intervals up to 36 months after DMEK and complications were recorded; 1 post mortem cornea was available for light microscopy...
March 21, 2017: Cornea
https://www.readbyqxmd.com/read/28345566/intraoperative-optical-coherence-tomography-in-anterior-segment-surgeries
#2
Jeewan S Titiyal, Manpreet Kaur, Ruchita Falera
Intraoperative optical coherence tomography (iOCT) is a noninvasive imaging modality that provides a real-time dynamic feedback of the various surgical steps. Comprehensive literature search was performed in MEDLINE using "intraoperative optical coherence tomography" and "iOCT" as keywords. The use of iOCT as an aid to decision-making has been successfully reported in cases undergoing keratoplasty, implantable Collamer lens (ICL) implantation as well as cataract surgery. iOCT helps to assess the graft-host relationship in penetrating keratoplasty...
February 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28342720/rebubbling-in-descemet-membrane-endothelial-keratoplasty-influence-of-pressure-and-duration-of-the-intracameral-air-tamponade
#3
Daniel Pilger, Ina Wilkemeyer, Jan Schroeter, Anna-Karina B Maier, Necip Torun
PURPOSE: To explore the impact of intracameral air tamponade pressure and duration on graft attachment and rebubbling rates. DESIGN: A prospective, interventional, non-randomized study METHODS: Setting: Charité - Universitätsmedizin Berlin, department of ophthalmology STUDY POPULATION: 117 patients who underwent Descemet membrane endothelial keratoplasty (DMEK) OBSERVATION: Intraocular pressure (IOP) at the end of the surgery, immediately after filling the anterior chamber with air, categorized into low (<10mmHg), normal (10-20mmHg) and high (>20mmHg) and the time until partial removal of the air...
March 22, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28337067/late-spontaneous-resolution-of-a-double-anterior-chamber-post-deep-anterior-lamellar-keratoplasty
#4
Andrea Passani, Angela Tindara Sframeli, Pasquale Loiudice, Marco Nardi
A 31-year-old healthy male underwent deep anterior lamellar keratoplasty with big-bubble technique for treatment of keratoconus in his right eye. One week after surgery, he presented with detachment of the endothelium-Descemet complex with formation of a double anterior chamber, despite the apparent absence of an intraoperative Descemet membrane rupture. A subsequent intervention with the intent to relocate the corneal graft button was not effective, because the detachment appeared again one day later. The authors hypothesized that, at the time of the stromal dissection with big bubble technique, a small amount of air penetrated into the anterior chamber, creating a false pathway through the trabecular meshwork...
January 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28328727/strategies-for-deep-anterior-lamellar-keratoplasty-after-hydrops-in-keratoconus
#5
Matthias Fuest, Jodhbir S Mehta
Corneal hydrops affects approximately 2.5% of keratoconus (KC) cases, predominantly young males approximately 25 years of age with steep cones. Often, patients are left with a vision-reducing corneal scar frequently necessitating surgical treatment. Penetrating keratoplasty (PK) has worse survival outcomes in hydrops than in general KC cases. Deep anterior lamellar keratoplasty (DALK) is a nonpenetrating technique believed to achieve equal or better outcomes in visual acuity, graft survival, endothelial rejection rates, and endothelial cell survival in comparison with PK, while maintaining globe integrity and the patients' Descemet membrane (DM) and endothelium...
March 21, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28315339/elastic-microfibril-distribution-in-the-cornea-differences-between-normal-and-keratoconic-stroma
#6
Tomas L White, Philip N Lewis, Robert D Young, Koji Kitazawa, Tsutomu Inatomi, Shigeru Kinoshita, Keith M Meek
The optical and biomechanical properties of the cornea are largely governed by the collagen-rich stroma, a layer that represents approximately 90% of the total thickness. Within the stroma, the specific arrangement of superimposed lamellae provides the tissue with tensile strength, whilst the spatial arrangement of individual collagen fibrils within the lamellae confers transparency. In keratoconus, this precise stromal arrangement is lost, resulting in ectasia and visual impairment. In the normal cornea, we previously characterised the three-dimensional arrangement of an elastic fiber network spanning the posterior stroma from limbus-to-limbus...
March 14, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28302098/in-vivo-confocal-microscopy-of-pre-descemet-corneal-dystrophy-associated-with-x-linked-ichthyosis-a-case-report
#7
Hui Shi, Xiao-Feng Qi, Tao-Tao Liu, Qian Hao, Xiao-Hong Li, Ling-Ling Liang, Yi-Miao Wang, Zhi-Hua Cui
BACKGROUND: Pre-Descemet corneal dystrophy (PDCD) is characterized by the presence of numerous, tiny, polymorphic opacities immediately anterior to Descemet membrane, which is a rare form of corneal stromal dystrophy and hard to be diagnosed. In vivo confocal microscopy (IVCM) is a useful tool to examine the minimal lesions of the cornea at the cellular level. In this article, we report a rare case of PDCD associated with X-linked ichthyosis and evaluate IVCM findings. CASE PRESENTATION: We present a 34-year-old male Chinese patient with PDCD associated with X-linked ichthyosis...
March 16, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28271013/ultrahigh-resolution-oct-imaging-of-the-human-cornea
#8
René M Werkmeister, Sabina Sapeta, Doreen Schmidl, Gerhard Garhöfer, Gerald Schmidinger, Valentin Aranha Dos Santos, Gerold C Aschinger, Isabella Baumgartner, Niklas Pircher, Florian Schwarzhans, Anca Pantalon, Harminder Dua, Leopold Schmetterer
We present imaging of corneal pathologies using optical coherence tomography (OCT) with high resolution. To this end, an ultrahigh-resolution spectral domain OCT (UHR-OCT) system based on a broad bandwidth Ti:sapphire laser is employed. With a central wavelength of 800 nm, the imaging device allows to acquire OCT data at the central, paracentral and peripheral cornea as well as the limbal region with 1.2 µm x 20 µm (axial x lateral) resolution at a rate of 140 000 A-scans/s. Structures of the anterior segment of the eye, not accessible with commercial OCT systems, are visualized...
February 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28270445/anterior-segment-optical-coherence-tomography-to-look-for-kayser-fleischer-rings
#9
REVIEW
Mittanamalli S Sridhar, Roberto Pineda
Ophthalmologists usually use slit lamp biomicroscopy to look for Kayser-Fleischer rings in Wilson's disease; anterior segment optical coherence tomography is a new alternative to identify the characteristic hyper-reflective layer in the deep corneal periphery at the level of Descemet's membrane. This method allows non-ophthalmologists to look for and to quantify Kayser-Fleischer rings.
March 7, 2017: Practical Neurology
https://www.readbyqxmd.com/read/28264217/descemet-membrane-endothelial-keratoplasty-dmek-in-the-presence-of-an-iris-prosthesis
#10
N Gerber-Hollbach, D Goldblum
No abstract text is available yet for this article.
March 6, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28259779/in-vivo-characteristics-of-corneal-endothelium-descemet-s-membrane-complex-for-the-diagnosis-of-corneal-graft-rejection
#11
Mohamed Abou Shousha, Sonia H Yoo, Mohamed S Sayed, Sean Edelstein, Matthew Council, Ravi S Shah, Joshua Abernathy, Zachary Schmitz, Patrick Stuart, Rocio Bentivegna, Maria P Fernandez, Christopher Smith, Xiaotang Yin, George J Harocopos, Sander R Dubovy, William J Feuer, Jianhua Wang, Victor L Perez
PURPOSE: To evaluate the utility of Endothelial/Descemet's membrane complex (En/DM) characteristics in diagnosing corneal graft rejection. DESIGN: Diagnostic reliability study. METHODS: 139 eyes (96 corneal grafts post penetrating keratoplasty or Descemet's stripping automated endothelial keratoplasty: 40 clear, 23 actively rejecting, 24 rejected and 9 non-immunological failed grafts, along with 43 age-matched control eyes) were imaged using high-definition optical coherence tomography...
March 1, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28258620/changes-in-lipidomic-profile-of-aqueous-humour-in-fuchs-endothelial-dystrophy
#12
Javier Cabrerizo, Javier Aritz Urcola, Elena Vecino, Gerrit Melles
PURPOSE: To identify and determine differences in lipid profile of aqueous humour (AH) in patients with Fuchs endothelial corneal dystrophy (FECD). METHODS: Lipidomic profile of eight AH samples of FECD patients and 10 control samples was analysed. Patients with previous history of anterior segment surgery, anterior segment pathology or intraocular injections were excluded. Topical ocular medications within the last 6 months were reported. Aqueous humour (AH) was obtained during the first step of Descemet membrane endothelial keratoplasty in FECD patients and during refractive lensectomy in the control group...
March 4, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28251080/clinical-results-of-non-descemet-stripping-endothelial-keratoplasty
#13
Tao Zhang, Shao-Wei Li, Tie-Hong Chen, Jing-Liang He, Yan-Wei Kang, Fang-Qi Lyu, Jian-Hua Ning, Chang Liu
AIM: To investigate the impact of non-Descemet stripping endothelial keratoplasty (non-DSEK) on graft rejection rate, and its overall procedural effectiveness in patients. METHODS: Non-DSEK was performed on 65 eyes of 64 patients, and the procedural outcomes, including rejection episodes, failure and dislocation of the grafts, best corrected visual acuity (BCVA), endothelial cell density (ECD), and other complications, were analyzed retrospectively. RESULTS: Of the 65 eyes, 63 recovered from bullous keratopathy with a clear cornea...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28243422/canaloplasty-versus-viscocanalostomy-in-primary-open-angle-glaucoma
#14
Faried Mohammed Wagdy
INTRODUCTION: The purpose of this study was to compare the efficacy and safety of canaloplasty versus viscocanalostomy in management of uncontrolled primary open angle glaucoma (POAG) with medication. METHODS: Canaloplasty surgery was applied for thirty eyes of thirty patients (45-55 years) with a mean age of 48 years (Group A) and viscocanalostomy surgery was applied also for thirty eyes of thirty patients (43-54 years) with a mean age of 46 years (group B). All patients were with uncontrolled primary open angle glaucoma by maximally tolerated medical therapy...
January 2017: Electronic Physician
https://www.readbyqxmd.com/read/28237153/current-indications-and-surgical-approaches-to-corneal-transplants-at-the-university-of-toronto-a-clinical-pathological-study
#15
Ryan Le, Narain Yucel, Shireen Khattak, Yeni H Yucel, Gerald J Prud'homme, Neeru Gupta
OBJECTIVE: To determine the most common reasons and surgical approaches for corneal graft surgery at the Kensington Eye Institute (KEI), University of Toronto. DESIGN: Retrospective cross-sectional study. PARTICIPANTS: A total of 229 consecutive corneal transplants performed at the KEI. METHODS: Demographic, clinical, and pathological data on all 2012 and 2013 corneal transplants were collected. RESULTS: The mean age for corneal transplants was 65 ± 16 years; 39% were full-thickness penetrating keratoplasties (PK) and 61% were partial-thickness...
February 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28235421/acute-corneal-hydrops-during-pregnancy-with-spontaneous-resolution-after-corneal-cross-linking-for-keratoconus-a-case-report
#16
Ricardo Alexandre Stock, Thaís Thumé, Elcio Luiz Bonamigo
BACKGROUND: Keratoconus may progress to acute corneal hydrops even after cross-linking. In some cases, keratoconus progresses during pregnancy. In this report, we present a case of a patient with increased anterior stromal resistance after cross-linking that would favor nonprogression of keratoconus during pregnancy. CASE PRESENTATION: We report that cross-linking is likely to have had a protective effect in a white pregnant patient with acute corneal hydrops who showed rapid improvement, as documented by corneal topography...
February 25, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28211878/pre-descemets-endothelial-keratoplasty-the-pdek-clamp-for-successful-pdek
#17
H S Dua, D G Said
PurposeTo design and produce a clamp that enables good handling of donor sclera-corneal disks, allows air to be injected in the corneal stroma and consistently provides pre-Descemets endothelial keratoplasty (PDEK) tissue by creation of a type-1 big bubble (BB) avoiding a type-2BB by shutting the fenestrations in the periphery of the pre-Descemets layer and preventing escape of air.Patients and methodsA clamp with spring loaded handles attached to two rings of 9 mm diameter and 1 mm width with a side port for insertion of a needle for air injection was designed and produced...
February 17, 2017: Eye
https://www.readbyqxmd.com/read/28160068/descemet-membrane-endothelial-keratoplasty-for-graft-failure-following-penetrating-keratoplasty
#18
Sonja Heinzelmann, Daniel Böhringer, Philipp Eberwein, Thabo Lapp, Thomas Reinhard, Philip Maier
PURPOSE: Descemet membrane endothelial keratoplasty (DMEK) is superior to penetrating keratoplasty (PK) in terms of visual rehabilitation, intraoperative safety and risk of rejection. Therefore, it seems reasonable to perform DMEK in eyes with endothelial failure following PK. We herein report our first clinical results. METHODS: Nineteen eyes with endothelial graft failure following PK were treated with DMEK. The majority of these eyes (12) had limited visual potential...
February 3, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28149669/survey-of-experts-on-current-endothelial-keratoplasty-techniques
#19
Winston Chamberlain, Ariana Austin, Mark Terry, Bennie H Jeng, Jennifer Rose-Nussbaumer
OBJECTIVE: To survey cornea specialists' opinions on different endothelial keratoplasty techniques and to gauge the perceived need for and utility of a randomized controlled trial (RCT) comparing them. METHODS: A short survey was distributed to a group of cornea specialists at the Endothelial Keratoplasty Group meeting at the American Academy of Ophthalmology meeting in November 2015. RESULTS: Thirty-three of 80 practicing surgeons present at the EKG meeting participated in the survey, yielding a response rate of 41%...
October 2016: Journal of Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28138772/effect-of-corneal-collagen-crosslinking-on-subsequent-deep-anterior-lamellar-keratoplasty-dalk-in-keratoconus
#20
Friederike Schaub, Philip Enders, Björn O Bachmann, Ludwig M Heindl, Claus Cursiefen
PURPOSE: The purpose was to investigate the impact of ultraviolet light corneal collagen crosslinking (UV-CXL) on the success rate and clinical outcome of subsequent deep anterior lamellar keratoplasty (DALK) in eyes with keratoconus (KC). METHODS: Medical records of 101 consecutive eyes with KC scheduled for big-bubble DALK surgery were screened retrospectively for details of previously performed UV-CXL, as well as intra- and postoperative complications of DALK surgery...
January 30, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
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