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Corneal Biomechanics

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https://www.readbyqxmd.com/read/29664553/changes-in-the-parameters-of-the-anterior-segment-of-the-eye-in-pregnant-women-literature-review
#1
Karol Taradaj, Tomasz Ginda, Piotr Ciechanowicz, Piotr Maciejewicz, Barbara Suchońska, Iwona Szymusik, Bożena Kociszewska-Najman, Mirosław Wielgoś, Dariusz Kęcik
The physiology of pregnancy is a curious issue for specialists from different branches of medicine and science. In this systematic review, the attention was focused on changes in eyes during pregnancy and confinement. To summarise and systematize actual knowledge in eyes' changes during pregnancy, publications from years 2011-2017 were analysed. Stud-ies about parameters of corneal endothelial cells, corneal biomechanical parameters, keratometric variables, intraocular pressure and biometry of the anterior chamber were compared...
2018: Ginekologia Polska
https://www.readbyqxmd.com/read/29660327/crimp-around-the-globe-patterns-of-collagen-crimp-across-the-corneoscleral-shell
#2
Ning-Jiun Jan, Bryn L Brazile, Danielle Hu, Garrett Grube, Jacob Wallace, Alexandra Gogola, Ian A Sigal
Our goal was to systematically quantify the collagen crimp morphology around the corneoscleral shell, and test the hypothesis that collagen crimp is not uniform over the globe. Axial longitudinal cryosections (30 μm) of three sheep eyes, fixed at 0 mmHg IOP, were imaged using polarized light microscopy to quantify the local collagen in 8 regions: two corneal (central and peripheral) and six scleral (limbus, anterior-equatorial, equatorial, posterior-equatorial, posterior and peripapillary). Collagen crimp period (length of one wave), tortuosity (path length divided by end-to-end length), waviness (SD of orientation), amplitude (half the peak to trough distance), and conformity (width of contiguous similarly oriented bundles) were measured in each region...
April 13, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29658515/assessment-of-corneal-and-fatty-tissues-biomechanical-response-in-dynamic-tonometry-tests-by-using-inverse-models
#3
Mohammad Jannesari, Mahmoud Kadkhodaei, Peiman Mosaddegh, Henryk Kasprzak, Mahmoud Jabbarvand Behrouz
PURPOSE: The assessment of corneal biomechanics is essential for studying ophthalmological operations, such as refractive surgeries, and for more accurate estimation of intraocular pressure. The chief aim of the current study is to characterize corneal and fatty tissues in order to construct a model to predict eye globe behavior during dynamic tonometry tests. METHODS: In the present study, images from corneal deformation, acquired from Corvis ST tonometer, were processed...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29643950/higher-intraocular-pressure-levels-associated-with-lower-hysteresis-in-type-2-diabetes
#4
Sinan Bekmez, Tolga Kocaturk
Aim: To investigate the differences of corneal biomechanic characteristics using Ocular Response Analyzer (ORA, Reichert; USA) on type 2 diabetics and healthy subjects. Methods: One hundred eyes of 100 subjects (between the ages of 17-91) who applied to Adnan Menderes University's Ophthalmology Clinic between January-March 2015 were included in this study, 50 diabetics (Group 1) and 50 healthy controls (Group 2). The eyes included in the study were randomly chosen...
2018: Open Ophthalmology Journal
https://www.readbyqxmd.com/read/29615281/corneal-biomechanics-after-laser-refractive-surgery-unmasking-differences-between-techniques
#5
REVIEW
Joaquín Fernández, Manuel Rodríguez-Vallejo, Javier Martínez, Ana Tauste, David P Piñero
The hypothesis that small-incision lenticule extraction provides better preservation of corneal biomechanics than previous laser refractive techniques has led to a growth in the interest in clinical and experimental research in this field. This hypothesis is based on the fact that corneal layers with greater stiffness are preserved with this new technique. However, this hypothesis is controversial because clinical research has shown a great disparity in the outcomes. In this review, we performed an in-depth analysis of the factors that might affect corneal biomechanics in laser refractive surgery procedures from a macrostructural to a microstructural viewpoint...
March 31, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29610851/refractive-correction-and-biomechanical-strength-following-smile-with-a-110-or-160-%C3%AE-m-cap-thickness-evaluated-ex-vivo-by-inflation-test
#6
Iben Bach Damgaard, Anders Ivarsen, Jesper Hjortdal
Purpose: To examine the refractive correction and corneal biomechanical strength after small incision lenticule extraction (SMILE) by using a 110- or 160-μm cap thickness. Methods: Thirty-two human donor corneas were allocated into 4 groups, combining one of two cap thicknesses (110 and 160 μm) with one of two spherical corrections (-4 D and -8 D). Each cornea was mounted on an artificial anterior chamber. The chamber pressure was adjusted by an attached 8% dextran media column...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29602301/sensitivity-of-corneal-biomechanical-and-optical-behavior-to-material-parameters-using-design-of-experiments-method
#7
Mengchen Xu, Amy L Lerner, Paul D Funkenbusch, Ashutosh Richhariya, Geunyoung Yoon
The optical performance of the human cornea under intraocular pressure (IOP) is the result of complex material properties and their interactions. The measurement of the numerous material parameters that define this material behavior may be key in the refinement of patient-specific models. The goal of this study was to investigate the relative contribution of these parameters to the biomechanical and optical responses of human cornea predicted by a widely accepted anisotropic hyperelastic finite element model, with regional variations in the alignment of fibers...
February 2018: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/29594788/the-effects-of-chalazion-surgery-on-intraocular-pressure-and-corneal-topography
#8
Cagri Ilhan, Meltem Ozgul Yilmazoglu, Pelin Yilmazbas
PURPOSE: To evaluate the effects of chalazion surgery on intraocular pressure (IOP) and the biomechanical, topographic, and topometric properties of the cornea. METHODS: A total of 29 patients with upper eyelid chalazion were included in this study. All patients underwent preoperative and postoperative detailed ophthalmological examinations including scale of chalazion size; IOP (IOPcc and IOPg), corneal hysteresis, and corneal resistance factor measurements using ocular response analyser (ORA; Reichert Instruments, Depew, NY, USA); topographic and topometric properties of the cornea using Pentacam HR (Oculus GmbH, Wetzlar, HE, Germany)...
March 28, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29588569/in-vivo-assessment-of-changes-in-corneal-hysteresis-and-lamina-cribrosa-position-during-acute-intraocular-pressure-elevation-in-eyes-with-markedly-asymmetrical-glaucoma
#9
Corrado Gizzi, Mauro Cellini, Emilio C Campos
Purpose: To investigate the biomechanical response of the cornea, lamina cribrosa (LC), and prelaminar tissue (PT) to an acute intraocular pressure (IOP) increase in patients with markedly asymmetrical glaucoma and in healthy controls. Patients and methods: A total of 24 eyes of 12 patients with markedly asymmetrical primary open-angle glaucoma (POAG) and 12 eyes of 12 healthy patients were examined with spectral-domain optical coherence tomography (SD-OCT) and ocular response analyzer (ORA) at baseline and during acute IOP elevation by means of an ophthalmodynamometer...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29587975/astigmatic-correction-by-intrastromal-astigmatic-keratotomy-during-femtosecond-laser-assisted-cataract-surgery-factors-in-outcomes
#10
Yong-Soo Byun, Seonjoo Kim, Marjorie Z Lazo, Mi-Hyun Choi, Min-Ji Kang, Jee-Hye Lee, Young-Sik Yoo, Woong-Joo Whang, Choun-Ki Joo
PURPOSE: To evaluate the 6-month outcomes of femtosecond laser astigmatic keratotomy (AK) combined with femtosecond laser-assisted cataract surgery and identify factors affecting the efficacy of astigmatic correction. SETTING: Seoul St. Mary's Hospital, Catholic University of Korea, Seoul, South Korea. DESIGN: Retrospective case series. METHODS: Femtosecond laser AK was performed during femtosecond laser-assisted cataract surgery...
February 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29576876/corneal-biomechanical-properties-after-fs-lasik-with-residual-bed-thickness-less-than-50-of-the-original-corneal-thickness
#11
Haixia Zhang, Muhammad Ahmad Khan, Di Zhang, Xiao Qin, Ding Lin, Lin Li
Background: The changes in corneal biomechanical properties after LASIK remain an unknown but important topic for surgical design and prognostic evaluation. This study aims to observe the postoperative corneal biomechanical properties one month after LASIK with amount of corneal cutting (ACC) greater than 50% of the central corneal thickness (CCT). Methods: FS-LASIK was performed in 10 left rabbit eyes with ACC being 60% (L60) and 65% (L65) of the CCT, while the right eyes (R) were the control...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29564407/corneal-hysteresis-and-corneal-resistance-factor-in-pellucid-marginal-degeneration
#12
Mohamad Reza Sedaghat, Hadi Ostadi-Moghadam, Mahmoud Jabbarvand, Farshad Askarizadeh, Hamed Momeni-Moghaddam, Foroozan Narooie-Noori
Purpose: To evaluate and compare corneal hysteresis (CH) and corneal resistance factor (CRF) in pellucid marginal degeneration (PMD), keratoconus (KCN), and normal eyes using the Ocular Response Analyzer (ORA). Methods: In this retrospective study, corneal biomechanical parameters were measured in patients with PMD ( n  = 102) and KCN ( n  = 202) and normal subjects ( n  = 208) using the ORA. Data, including full patient history as well as the results of refraction, slit-lamp biomicroscopy, Pentacam HR (Oculus), and ORA (Reichert; Buffalo, New York, USA), were collected from medical records...
March 2018: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/29564359/femtosecond-laser-assisted-astigmatic-keratotomy-a-review
#13
REVIEW
John S M Chang
Background: Astigmatic keratotomy (AK) remains an accessible means to correct surgically induced or naturally occurring astigmatism. The advantages of femtosecond laser-assisted astigmatic keratotomy (FSAK) over conventional methods have been recognized recently. Main text: This review evaluates the efficacy, complications, and different methods of FSAK for correction of astigmatism in native eyes and those that underwent previous penetrating keratoplasty (PKP)...
2018: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/29561496/effects-of-thickness-on-corneal-biomechanical-properties-using-optical-coherence-elastography
#14
Srilatha Vantipalli, Jiasong Li, Manmohan Singh, Salavat R Aglyamov, Kirill V Larin, Michael D Twa
SIGNIFICANCE: Measured corneal biomechanical properties are driven by intraocular pressure, tissue thickness, and inherent material properties. We demonstrate tissue thickness as an important factor in the measurement of corneal biomechanics that can confound short-term effects due to UV riboflavin cross-linking (CXL) treatment. PURPOSE: We isolate the effects of tissue thickness on the measured corneal biomechanical properties using optical coherence elastography by experimentally altering the tissue hydration state and stiffness...
March 21, 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29558028/a-comparison-of-intraocular-pressure-values-obtained-using-a-goldmann-applanation-tonometer-and-a-handheld-version-of-applanation-resonance-tonometer-a-preliminary-report
#15
Małgorzata Mulak, Wojciech A Czak, Małgorzata Mimier, Radosław Kaczmarek
BACKGROUND: Despite the development of various methods of intraocular pressure (IOP) measurement, Goldmann applanation tonometry (GAT) is still the most popular. The measurement using GAT depends on the biomechanical properties of the cornea, such as the thickness, the radius of curvature, as well as the amount of the fluorescein used. OBJECTIVES: The aim of the study was to compare IOP values measured by GAT with those measured by applanation resonance tonometry (ART)...
March 19, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29557828/the-influence-of-corneal-biomechanical-properties-on-intraocular-pressure-measurements-using-a-rebound-self-tonometer
#16
Lyndsay Brown, William Foulsham, Savva Pronin, Andrew J Tatham
PURPOSE: To examine the effect of corneal biomechanical properties on intraocular pressure (IOP) measurements obtained using a rebound self-tonometer (Icare HOME) compared to Goldmann applanation tonometry (GAT). METHODS: An observational study of 100 patients with glaucoma or ocular hypertension. All had a comprehensive ophthalmic examination and standard automated perimetry. IOP was assessed by GAT, Icare HOME and Ocular Response Analyzer (ORA), which was also used to assess corneal hysteresis (CH) and corneal resistance factor (CRF)...
March 19, 2018: Journal of Glaucoma
https://www.readbyqxmd.com/read/29543194/-strength-properties-of-rabbit-cornea-after-femtosecond-laser-keratoplasty-with-and-without-different-intracorneal-implants
#17
N P Pashtaev, N A Pozdeeva, V V Zotov, M V Sinitsyn, M A Shcheglova
AIM: to conduct a comparative experimental study of the effect of the use of intracorneal implants during femtosecond laser-assisted intrastromal pocket (IP) and intrastromal tunnel (IT) formation on the strength properties of the cornea. MATERIAL AND METHODS: The experimental study was performed on 24 corneas of 12 rabbit eyes enucleated 1 month after slaughtering. All eyes were divided into 6 groups according to the method of operation. IP and IT were created with IntraLase FS 60 kHz femtolaser...
2018: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/29525839/ocular-manifestation-in-marfan-syndrome-corneal-biomechanical-properties-relate-to-increased-systemic-score-points
#18
Dido Scheibenberger, Andreas Frings, Johannes Steinberg, Helke Schüler, Vasyl Druchkiv, Toam Katz, Yskert von Kodolitsch, Stephan Linke
PURPOSE: To evaluate corneal deformation to an air puff as a new noninvasive tool to document disease status in Marfan syndrome (MFS) METHODS: Prospective observational cohort study. We included patients diagnosed with MFS who had their routine cardiovascular follow-up and applied the revised Ghent nosology to define two subgroups according to a high (≥ 7) and a low (< 7 points) systemic score. Dynamic Scheimpflug-based biomechanical analyses (CorvisST® [CST; Oculus GmbH]) were performed...
March 10, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29518874/-the-association-between-corneal-biomechanical-parameters-and-visual-field-progression-in-patients-with-normal-tension-glaucoma
#19
B B Li, Y Cai, Y Z Pan, M Li, Y Fang, T Tian, X M Yan
Objective: To evaluate the association between corneal biomechanical parameters and visual field (VF) progression in normal tension glaucoma (NTG) using the Corvis-ST device, and to evaluate the ability of corneal biomechanical parameters to predict the VF progression. Methods: Corneal biomechanical parameters of newly diagnosed NTG patients were obtained using Corvis-ST in the baseline follow-up visit. The VF progression was defined as a 4-point increase in the Advanced Glaucoma Intervention Study (AGIS) score compared to the baseline in three consecutive follow-up visits (per 3-6 months)...
March 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29514380/-evaluation-of-changes-in-corneal-biomechanics-in-patients-with-systemic-sclerosis
#20
Nicole Zimmermann, Svea Brandt, Jeanette Brünner, Carl Erb
INTRODUCTION: Our study compares the biomechanical properties of the cornea in patients with long-term pre-existing (for at least 10 years) systemic sclerosis (SSc) with those of healthy suspects. MATERIAL/METHODS: The examination was performed in 14 systemic SSc patients and 38 healthy volunteers. Non-invasive assessment of corneal biomechanical parameters, including central corneal thickness (CCT), corneal hysteresis (CH) and corneal resistance factor (CRF), was performed in one randomised study eye in accordance with a standardised protocol...
March 7, 2018: Klinische Monatsblätter Für Augenheilkunde
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