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pellucid marginal degeneration

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https://www.readbyqxmd.com/read/28953598/the-impact-of-scleral-contact-lens-vault-on-visual-acuity-and-comfort
#1
Heinz Otchere, Lyndon Jones, Luigina Sorbara
PURPOSE: To assess how varying degrees of corneal clearance of scleral contact lenses (ScCL) impact visual acuity (VA) and comfort in patients with corneal ectasia. METHOD: Three ScCL were fitted to 20 subjects with previous diagnosis of either keratoconus (n=18) or pellucid marginal degeneration (n=2). Fitting of ScCL was based on corneal sagittal height (CSH) measured with Visante OCT at a 15-mm chord on the horizontal meridian. To select the ScCL from the diagnostic lens set, values of 325, 375, and 425 μm were randomly added in sequence to CSH...
September 26, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28937143/crab-claw-pattern-on-corneal-topography-pellucid-marginal-degeneration-or-inferior-keratoconus
#2
M Koc, K Tekin, M Inanc, P Kosekahya, P Yilmazbas
PurposeTo evaluate the topographic, tomographic, and densitometric properties of patients with pellucid marginal degeneration (PMD) and inferior keratoconus.Patients and methodsRetrospective, comparative case series. Forty-seven eyes of 32 patients with crab claw patterns were identified from 2751 patients with corneal ectasia. They were divided into two groups, inferior keratoconus and PMD, based on clinical findings. The topographic, tomographic, and densitometric measurements were analyzed.ResultsPMD was detected in 11 eyes of eight patients (mean age 50...
September 22, 2017: Eye
https://www.readbyqxmd.com/read/28816727/effect-of-time-on-scleral-lens-settling-and-change-in-corneal-clearance
#3
Heinz Otchere, Lyndon W Jones, Luigina Sorbara
SIGNIFICANCE: With the increase in the use of scleral contact lenses among practitioners, questions regarding lens settling are gradually gaining attention. This is because current studies support the notion that scleral lenses settle back over time. More research is needed to understand the exact cause and the factors that underpin such phenomenon. PURPOSE: The present study aims to assess the effect of time on topographic corneal clearance of three scleral contact lenses of varying sagittal depths...
September 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28745658/-results-of-corneal-crosslinking-for-pellucid-marginal-corneal-degeneration
#4
M M Bikbov, V K Surkova, A R Khalimov, E L Usubov
AIM: to evaluate the clinical effectiveness of crosslinking in patients with progressive pellucid marginal corneal degeneration (PMCD). MATERIAL AND METHODS: A total of 9 patients (16 eyes) with progressive PMCD were treated by standard crosslinking. The cornea was saturated with Dextralink solution and UV-A irradiated at 3 mW/cm2 for 30 minutes. The follow-up period was 12 months. RESULTS: One month after treatment, there was a slight decrease in uncorrected and best corrected visual acuity (UCVA and BCVA) - from 0...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28737665/refractive-and-corneal-aberrometric-changes-after-crescentic-lamellar-wedge-resection-in-pellucid-marginal-degeneration
#5
Selim Genç, Hanefi Çakır, Emre Güler, Ümit Çallı
OBJECTIVE: To evaluate the effectiveness of crescentic corneal lamellar wedge resection for the treatment of pellucid marginal degeneration (PMD) in improving refractive, visual, and corneal aberrometry. METHODS: The study included 10 eyes of 10 patients who had undergone corneal lamellar wedge resection for PMD. Pellucid marginal degeneration was diagnosed based on the clinical signs and corneal topography. The corneal aberrometry was evaluated with Sirius corneal topography...
July 21, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28658437/indications-and-visual-outcomes-of-intrastromal-corneal-ring-segment-implantation-in-a-large-patient-series
#6
Taíse Tognon, Mauro Campos, João Paulo Wengrzynovski, Kleyton Arlindo Barella, Adriano Pasqualotti, Luiz Antônio de Brito Martins, Adriana Dos Santos Forseto, Luciene Barbosa de Sousa
OBJECTIVES: To describe the indications for and visual outcomes of intrastromal corneal ring segment implantation. METHODS: A large retrospective case-series chart-review study was conducted using Sorocaba Ophthalmological Hospital medical records. This study included 1222 eyes (1196 patients) that were surgically treated between November 2009 and December 2012. The following preoperative data were collected: age, gender, type of medical care and funding source, surgical technique, best-corrected visual acuity, manifest sphere and cylinder refractive error, maximum and minimum central keratometry, and pachymetry measurements of the cornea at the thinnest point and at the ring channel...
June 2017: Clinics
https://www.readbyqxmd.com/read/28579380/-acute-spontaneous-corneal-hydrops-in-a-patient-with-pellucid-marginal-corneal-degeneration
#7
S Harchali, S Azenoud, S Elmerrouni, M Zarrouki, M Elyadari, E Abdellah, A Berraho
No abstract text is available yet for this article.
June 1, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28290963/longitudinal-outcomes-of-u-s-air-force-pilot-applicants-with-waivered-astigmatism
#8
David E Andrus, Jared T Haynes, Steven T Wright
BACKGROUND: Current U.S. Air Force medical standards allow applicants to enter pilot training with up to 1.50 D of astigmatism. However, waivers are considered for individuals with up to 3.00 D of astigmatism. Although typically a benign finding, higher levels of astigmatism may be progressive and can be associated with corneal ectasia (e.g., keratoconus or pellucid marginal degeneration) leading to reduced visual acuity with spectacles and/or soft contact lenses. The goal of this study was to evaluate the long-term outcomes of pilot applicants waivered into training with astigmatism exceeding the aeromedical standard...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/27994396/surgical-treatment-of-corneal-ectasia-with-motowa-s-trephine-and-selective-suturing-technique
#9
Saeed Al-Motowa, Mosa Al-Harby
A 40-year-old male presented with bilateral ectasia, contact lens intolerance, and astigmatism >10 D in both eyes. The patient had end-stage pellucid marginal degeneration that warranted surgical treatment. We present a unique surgical technique to stabilize the cornea, minimize astigmatism, improve vision and corneal status, and avoid penetrating keratoplasty.
October 2016: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/27914659/corneal-collagen-cross-linking-a-review-of-its-clinical-applications
#10
K Balparda, M J Maldonado
OBJECTIVE: To perform a literature review of the current clinical applications of corneal collagen cross-linking. METHODS: An exhaustive literature search was made, including the main biomedical databases, and encompassing all years since the introduction of cross-linking in ophthalmology practice. RESULTS: Corneal collagen cross-linking using UVA irradiation and riboflavin is a surgical technique that is currently being optimised, and is supported by a good amount of pre-clinical and clinical studies...
April 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/27432029/clinical-outcomes-of-scleral-misa-lenses-for-visual-rehabilitation-in-patients-with-pellucid-marginal-degeneration
#11
Leyla Asena, Dilek Dursun Altınörs
PURPOSE: To report the clinical outcomes of scleral Misa(®) lenses (Microlens Contactlens Technolgy, Arnhem, Netherlands) for visual rehabilitation in patients with pellucid marginal degeneration (PMD). MEHODS: In this prospective interventional case series, 24 eyes of 12 PMD patients were fitted with scleral Misa(®) lenses. Patients were followed regularly for continuous daily wearing time (CDWT), contact lens handling issues, visual acuity, and any subjective or objective contact lens related complications...
December 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27401170/national-survey-of-pellucid-marginal-corneal-degeneration-in-japan
#12
MULTICENTER STUDY
Jun Shimazaki, Naoyuki Maeda, Osamu Hieda, Yuichi Ohashi, Akira Murakami, Kohji Nishida, Kazuo Tsubota
PURPOSE: A national survey was conducted in Japan to analyze the clinical characteristics of pellucid marginal corneal degeneration (PMD). METHODS: A questionnaire was sent to all members of the Japan Cornea Society requesting demographic and clinical findings on PMD patients who had been examined between 2008 and 2010. The presence of band-shaped peripheral corneal thinning, detected by slit-lamp biomicroscopy or by a pachymetric map, was set as the diagnostic criterion of PMD...
September 2016: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/27315289/prevention-of-iatrogenic-keratectasia
#13
REVIEW
C J Rapuano
Iatrogenic corneal ectasia is a rare but devastating complication after refractive surgery. While its incidence appears to be declining, it has not been eliminated. Its cause is probably related to a combination of an intrinsic predisposition to ectasia and an additional anatomical destabilising effect from the refractive surgery. Determining which eyes are intrinsically "weak" and exactly how much additional "weakening" an eye can withstand before developing progressive thinning and protrusion are both difficult tasks...
June 2016: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/27146937/corneal-perforation-during-scleral-indentation-in-a-patient-with-pellucid-marginal-degeneration
#14
Karl Mercieca, Aruna Dharmasena, Charles Hopley
An observational case report of corneal perforation following scleral indentation in a patient with previously undiagnosed pellucid marginal degeneration is presented. Clinical examination, investigations, and subsequent management of this unwarranted and rare complication are described and discussed. The case highlights the need for thorough anterior segment examination before indirect ophthalmoscopy particularly in the presence of ectatic corneal pathology in which case scleral indentation should be avoided...
March 2016: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/27074131/tear-mediators-in-corneal-ectatic-disorders
#15
Dorottya Pásztor, Bence Lajos Kolozsvári, Adrienne Csutak, András Berta, Ziad Hassan, Bernadett Ujhelyi, Péter Gogolák, Mariann Fodor
PURPOSE: To compare the concentrations of 11 tear mediators in order to reveal the biochemical difference between pellucid marginal degeneration (PMD) and keratoconus (KC). METHODS: We have designed a cross-sectional study in which patients with corneal ectasia based on slit-lamp biomicroscopy and Pentacam HR (keratometry values (K1, K2, Kmax), astigmatism, minimal radius of curvature (Rmin), corneal thickness (Apex and Min), indices (surface variation, vertical asymmetry, keratoconus, central keratoconus, height asymmetry and decentration)) were enrolled...
2016: PloS One
https://www.readbyqxmd.com/read/27055210/sclerocorneal-intrastromal-lamellar-keratoplasty-for-pellucid-marginal-degeneration
#16
Damien Guindolet, Alexandra Petrovic, Serge Doan, Isabelle Cochereau, Eric E Gabison
PURPOSE: Surgical management of advanced pellucid marginal degeneration is challenging. To correct both corneal thinning and induced corneal astigmatism, we propose a modified intrastromal lamellar sclero-keratoplasty. METHODS: Corneal thinning was mapped using perioperative optical coherence tomography (OCT). Then through a scleral tunnel, an intrastromal pocket was created by stromal lamellar dissection under OCT guidance. A 300 μm-thick stromal lamellar graft was inserted in that pocket before closing the sclera to increase vertical median keratometry...
June 2016: Cornea
https://www.readbyqxmd.com/read/26890659/characterization-of-ocular-biomechanics-in-pellucid-marginal-degeneration
#17
Janine Lenk, Michael Haustein, Naim Terai, Eberhard Spoerl, Frederik Raiskup
PURPOSE: This study sought to investigate the diagnostic capacity of corneal biomechanical response parameters in a group of patients with pellucid marginal degeneration (PMD) using the Ocular Response Analyzer (ORA) and Corvis ST devices. METHODS: In this prospective clinical study, we used the Corvis ST and ORA devices to investigate the ocular biomechanics of patients with PMD. Eighty-one eyes were included, and 2 study groups were formed: the PMD group (the study group, n = 29) and the control group (n = 52)...
April 2016: Cornea
https://www.readbyqxmd.com/read/26874154/comparison-of-intraocular-pressure-post-penetrating-keratoplasty-vs-descemet-s-stripping-endothelial-keratoplasty
#18
COMPARATIVE STUDY
Rahul A Sharma, Lulu L C D Bursztyn, Elizabeth Golesic, Rookaya Mather, David P Tingey
OBJECTIVE: To compare the effect of Descemet's stripping endothelial keratoplasty (DSEK) with penetrating keratoplasty (PKP) on intraocular pressure (IOP) and use of ocular antihypertensives. DESIGN: Retrospective cohort study. PARTICIPANTS: Thirty-five eyes in 33 patients undergoing PKP and 43 eyes in 38 patients undergoing DSEK were included in the analysis. Fifteen eyes undergoing PKP and 12 undergoing DSEK had diagnosed glaucoma. Patients undergoing corneal transplant because of trauma, keratoconus, pellucid marginal degeneration, or prior failed transplant were excluded...
February 2016: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/26812714/sliding-keratoplasty-followed-by-transepithelial-iontophoresis-collagen-cross-linking-for-pellucid-marginal-degeneration
#19
Leopoldo Spadea, Giorgia Maraone, Carlo Cagini
PURPOSE: To describe the changes in visual acuity and topographic analysis in a patient affected by advanced pellucid marginal degeneration (PMD). METHODS: A 59-year-old woman with bilateral PMD who was contact lens intolerant was treated by sliding keratoplasty before and 3 months after transepithelial (epi-on) iontophoresis collagen cross-linking (I-CXL) in one eye. Corrected distance visual acuity (CDVA), spherical equivalent and cylinder refraction, corneal topography, ultrasound pachymetry, and endothelial cell count were assessed at baseline and up to 12 months postoperatively...
January 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/26604671/scleral-lens-for-keratoconus-technology-update
#20
REVIEW
Varsha M Rathi, Preeji S Mandathara, Mukesh Taneja, Srikanth Dumpati, Virender S Sangwan
Scleral lenses are large diameter lenses which rest over the sclera, unlike the conventional contact lenses which rest on the cornea. These lenses are fitted to not touch the cornea and there is a space created between the cornea and the lens. These lenses are inserted in the eyes after filling with sterile isotonic fluid. Generally, scleral contact lenses are used for high irregular astigmatism as seen in various corneal ectatic diseases such as keratoconus, pellucid marginal degeneration, or/and as liquid bandage in ocular surface disorders...
2015: Clinical Ophthalmology
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