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Corneal Hysteresis

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https://www.readbyqxmd.com/read/29924405/optic-nerve-tissue-displacement-during-mild-intraocular-pressure-elevation-its-relationship-to-central-corneal-thickness-and-corneal-hysteresis
#1
Phillip Bedggood, Fumi Tanabe, Allison M McKendrick, Andrew Turpin, Andrew J Anderson, Bang V Bui
PURPOSE: To determine the extent to which (1) optic nerve tissue is displaced following mild acute elevation of intraocular pressure, and (2) clinically accessible measures at the anterior eye can be used as a surrogate for such displacements. METHODS: We imaged the optic disc of 21 healthy subjects before and after intraocular pressure (IOP) elevation of ~10 mmHg delivered by ophthalmodynamometry. Steady-state tissue displacement during IOP elevation was assessed axially from OCT data, and laterally from SLO data...
July 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29889297/long-term-results-of-corneal-cross-linking-for-terrien-s-marginal-degeneration
#2
José Lamarca, Borja Salvador-Culla, Carlos Fernández-Vega, Rafael I Barraquer
PURPOSE: To report the long-term clinical outcomes of a patient with Terrien's marginal degeneration who underwent successful peripheral corneal cross-linking (CXL) to arrest progression. METHODS: Clinical assessment included uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), corneal topography, anterior segment optical coherence tomography, ultrasonic pachymetry, corneal hysteresis, and corneal resistance factor. Eccentric epithelium-off CXL was performed in both eyes after limbal conjunctival resection...
June 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29877927/goldmann-applanation-tonometer-versus-ocular-response-analyzer-for-measuring-intraocular-pressure-after-descemet-stripping-automated-endothelial-keratoplasty
#3
Sepehr Feizi, Amir Faramarzi, Ali Masoudi, Amir A Azari, Amirreza Veisi
PURPOSE: To evaluate agreement between IOP measured using the ocular response analyzer (ORA) versus using the Goldmann applanation tonometer (GAT) in patients treated by Descemet stripping automated endothelial keratoplasty (DSAEK). METHODS: This prospective, case-control study comprised 38 normal eyes and 37 post-DSAEK eyes. IOP was measured using the GAT (IOPGAT). The ORA was used to measure corneal biomechanics and cornea-compensated IOP (IOPCC). Corneal hysteresis (CH), corneal resistance factor, and IOP measurements of the 2 groups were compared...
June 5, 2018: Cornea
https://www.readbyqxmd.com/read/29847493/diagnostic-ability-of-corneal-shape-and-biomechanical-parameters-for-detecting-frank-keratoconus
#4
Mohammad-Reza Sedaghat, Hamed Momeni-Moghaddam, Renato Ambrósio, Hamid-Reza Heidari, Nasim Maddah, Zeynab Danesh, Fatemeh Sabzi
PURPOSE: To assess the diagnostic capability of corneal shape and biomechanical parameters for distinguishing normal eyes from frank keratoconus (KCN). METHODS: This is a retrospective analysis of eyes of 137 control subjects and 145 patients with KCN, with one of their eyes randomly selected as the study eye. Corneal biomechanical parameters were assessed using the Corvis ST (Oculus Optikgeräte GmbH) and Oculus Response Analyzer (Reichert Ophthalmic Instruments)...
May 25, 2018: Cornea
https://www.readbyqxmd.com/read/29844658/evaluation-of-femtosecond-laser-in-flap-and-cap-creation-in-corneal-refractive-surgery-for-myopia-a-3-year-follow-up
#5
Mohamed Nagy Elmohamady, Walid Abdelghaffar, Ahmed Daifalla, Tamer Salem
Purpose: To evaluate femtosecond laser in flap and cap creation, detect some corneal biomechanical changes, and evaluate dry eye after laser in situ keratomileusis (LASIK), Femto-LASIK, and small incision lenticule extraction (SMILE) with 3-year follow-up. Patients and methods: Preoperative evaluation taken: full ophthalmic examination, Pentacam, ocular response analyzer, ocular surface disease index (OSDI), and tear breakup time (TBUT). LASIK flap was created using Moria microkeratome in 30 eyes (LASIK group) and using VisuMax femtosecond laser in 38 eyes (FS-LASIK group) and SMILE was done by VisuMax in 35 eyes (SMILE group)...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29802262/corneal-biomechanical-properties-are-associated-with-the-activity-and-prognosis-of-angioid-streaks
#6
Shotaro Asano, Kosuke Nakajima, Kana Kure, Keiko Azuma, Kimiko Shimizu, Hiroshi Murata, Tatsuya Inoue, Ryo Obata, Ryo Asaoka
The aim of the current study is to investigate corneal biomechanical properties in detail using Ocular Response Analyzer (ORA) and Corvis ST (CST) tonometry and to analyze the association between corneal biomechanical properties and the frequency of intravitreal anti-vascular endothelial growth factor (VEGF) injections (FIV ) in AS eyes with choroidal neovascularization (CNV). Twenty-eight eyes of 15 patients with AS were enrolled. Mean age of AS patients was 67.9 ± 9.8 years. ORA and CST measurements were carried out, in addition to comprehensive ophthalmic examinations...
May 25, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29784159/changes-in-corneal-biomechanical-properties-after-24-hours-of-continuous-intraocular-pressure-monitoring-using-a-contact-lens-sensor
#7
Laura Morales-Fernandez, Javier Garcia-Bella, Jose M Martinez-de-la-Casa, Rubén Sanchez-Jean, Federico Saenz-Frances, Pedro Arriola-Villalobos, Lucia Perucho, Enrique Santos-Bueso, Julian Garcia-Feijoo
OBJECTIVE: This study was designed to assess changes in corneal topography and biomechanics after intraocular pressure (IOP) monitoring using the Triggerfish contact lens sensor (CLS). METHODS: For this prospective study, 30 eyes of 30 subjects: 14 healthy subjects (G1) and 6 glaucoma patients (G2), were recruited for 24 hours of continuous IOP monitoring using the CLS. The following measurements were taken before CLS fitting and after lens removal: maximum keratometry (Kmax), mean keratometry (MK), and corneal astigmatism (Cyl) measured through Pentacam corneal topography, and the corneal biomechanical variables corneal hysteresis (CH) and corneal resistance factor (CRF) measured with the Ocular Response Analyzer (ORA)...
June 2018: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/29773456/custom-air-puff-derived-biomechanical-variables-in-a-refractive-surgery-screening-setting-study-from-2-centers
#8
Vinicius S De Stefano, Ibrahim Seven, J Bradley Randleman, William J Dupps
PURPOSE: To assess the ability of air puff-derived biomechanical variables to predict surgeon-perceived candidacy for laser in situ keratomileusis (LASIK). SETTING: Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, and Emory Eye Institute, Emory University, Atlanta, Georgia, USA. DESIGN: Retrospective case series. METHODS: Data were collected from refractive surgery screening examinations by 2 surgeons at 2 centers...
May 15, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29643950/higher-intraocular-pressure-levels-associated-with-lower-hysteresis-in-type-2-diabetes
#9
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/29606853/the-role-of-corneal-hysteresis-during-the-evaluation-of-patients-with-possible-normal-tension-glaucoma
#10
Ming Chen, Laura Kueny, Arthur L Schwartz
Purpose: There are multiple reports of the role of corneal hysteresis (CH) as an independent risk factor for the diagnosis and risk of progression of normal-tension glaucoma (NTG). Our study measured CH with the Ocular Response Analyzer (ORA) in patients with intraocular pressure (IOP) <21 mmHg to investigate if a low CH would identify NTG in this Asian-based practice. Methods: This was a prospective cross-sectional study of patients who underwent routine eye examination during 2016 in a private practice in Honolulu, Hawaii, where most patients are Asian...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29594788/the-effects-of-chalazion-surgery-on-intraocular-pressure-and-corneal-topography
#11
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
#12
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
#13
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/29564407/corneal-hysteresis-and-corneal-resistance-factor-in-pellucid-marginal-degeneration
#14
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/29557828/the-influence-of-corneal-biomechanical-properties-on-intraocular-pressure-measurements-using-a-rebound-self-tonometer
#15
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/29514380/-evaluation-of-changes-in-corneal-biomechanics-in-patients-with-systemic-sclerosis
#16
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
https://www.readbyqxmd.com/read/29445204/the-effect-of-air-pulse-driven-whole-eye-motion-on-the-association-between-corneal-hysteresis-and-glaucomatous-visual-field-progression
#17
Shuichiro Aoki, Hiroshi Murata, Masato Matsuura, Yuri Fujino, Shunsuke Nakakura, Yoshitaka Nakao, Yoshiaki Kiuchi, Ryo Asaoka
Corneal hysteresis (CH) measured with Ocular Response Analyzer (Reichert: ORA) has been reported to be closely related to the glaucomatous visual field (VF) progression. The air pulse applied to an eye not only induces corneal deformation, but also whole eye motion (WEM), which may result in an inaccurate measurement of CH. Here we investigated the influence of air pulse-driven WEM measured with the Corivs ST (CST® , OCULUS) on the relationship between CH and VF progression in primary open angle-glaucoma patients...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29420326/corneal-biomechanical-properties-in-obstructive-sleep-apnea-syndrome
#18
Funda Dikkaya, Rengin Yıldırım, Sevil Karaman Erdur, Gülçin Benbir, Rukiye Aydın, Derya Karadeniz
OBJECTIVES: To investigate the corneal biomechanical properties and anterior segment parameters in patients with obstructive sleep apnea syndrome (OSAS). METHODS: Fifty-four eyes of 54 patients with OSAS and 20 eyes of 20 healthy subjects were included. Patients with mild and moderate OSAS (Respiratory Disturbance Index [RDI] <30) enrolled in group 1, those with severe OSAS (RDI≥30) in group 2 and controls in group 3. Corneal biomechanical properties including corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann-correlated intraocular pressure (IOPg), and corneal-compensated intraocular pressure (IOPcc) were measured with ocular response analyzer...
February 7, 2018: Eye & Contact Lens
https://www.readbyqxmd.com/read/29398901/simultaneous-intratunnel-cross-linking-with-intrastromal-corneal-ring-segment-implantation-versus-simultaneous-epithelium-off-cross-linking-with-intrastromal-corneal-ring-segment-implantation-for-keratoconus-management
#19
Mohamed Hosny, Moustafa Nour, Sarah Azzam, Mohsen Salem, Esraa El-Mayah
Purpose: The purpose of this study is to compare the efficacy of intratunnel cross-linking combined with intrastromal corneal ring segment (ICRS) implantation versus combined epithelium-off (epi-off) cross-linking and ICRS implantation for the management of keratoconus. Methods: Our study included 20 eyes of 12 patients with moderate-to-severe keratoconus. Group A included 10 eyes that underwent simultaneous ICRS implantation with intratunnel cross-linking. Group B included 10 eyes that underwent simultaneous ICRS implantation with epi-off cross-linking...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29370019/can-corneal-biomechanical-properties-explain-difference-in-tonometric-measurement-in-normal-eyes
#20
Ashim Dey, Rathini Lilian David, Rashima Asokan, Ronnie George
SIGNIFICANCE: Corneal biomechanical parameters can affect intraocular pressure (IOP) measurements by different tonometers compared with Goldmann applanation tonometer. This study implies that corneal hysteresis (CH) and corneal resistance factor (CRF) better explain variability in IOP measurements. PURPOSE: The aim of this study was to evaluate the effect of corneal properties on the difference in IOP measured by the Ocular Response Analyzer (ORA), Rebound Tonometer (RBT), Dynamic Contour Tonometer (DCT), and Tono-Pen from the Goldmann applanation tonometer (GAT)...
February 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
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