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Corneal Hysteresis

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https://www.readbyqxmd.com/read/29643950/higher-intraocular-pressure-levels-associated-with-lower-hysteresis-in-type-2-diabetes
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/29334923/relationship-between-corneal-biomechanical-properties-and-structural-biomarkers-in-patients-with-normal-tension-glaucoma-a-retrospective-study
#13
COMPARATIVE STUDY
Keunheung Park, Jonghoon Shin, Jiwoong Lee
BACKGROUND: We evaluated the relationships between corneal biomechanical properties and structural parameters in patients with newly diagnosed, untreated normal-tension glaucoma (NTG). METHODS: All subjects were evaluated using an Ocular Response Analyzer (ORA) measuring corneal hysteresis (CH) and the corneal resistance factor (CRF). Central corneal thickness (CCT), Goldmann applanation tonometric (GAT) data, axial length, and the spherical equivalent (SE), were also measured...
January 15, 2018: BMC Ophthalmology
https://www.readbyqxmd.com/read/29305310/a-prospective-longitudinal-study-to-investigate-corneal-hysteresis-as-a-risk-factor-for-predicting-development-of-glaucoma
#14
Carolina N Susanna, Alberto Diniz-Filho, Fábio B Daga, Bianca N Susanna, Feilin Zhu, Nara G Ogata, Felipe A Medeiros
PURPOSE: To investigate the role of corneal hysteresis (CH) as a risk factor for development of glaucoma. DESIGN: Prospective observational cohort study. METHODS: Two hundred and eighty-seven eyes of 199 patients suspected of having glaucoma were followed for an average of 3.9 ± 1.8 years. All eyes had normal visual fields at baseline. Development of glaucoma was defined as occurrence of 3 consecutive abnormal standard automated perimetry tests during follow-up, defined as pattern standard deviation (PSD) < 5%, and/or Glaucoma Hemifield Test outside normal limits...
March 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29297099/assessment-of-corneal-biomechanical-properties-with-inflation-test-using-optical-coherence-tomography
#15
Like Wang, Lei Tian, Yanping Huang, Yifei Huang, Yongping Zheng
Biomechanical properties are important for the cornea to maintain its normal shape and function. There is still a need to develop better methods for accurate measurement of corneal mechanical properties. In this study, we propose to introduce the optical coherence tomography (OCT) in inflation test for the imaging of corneal deformation in order to measure its biomechanical properties. Ten cornea-mimicking silicone phantoms with different stiffness and five fresh porcine corneas were tested using the proposed method...
February 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29283900/corneal-biomechanical-properties-and-central-corneal-thickness-in-pediatric-noninfectious-uveitis-a-controlled-study
#16
Emine Sen, Melike Balikoglu-Yilmaz, Pinar Ozdal
OBJECTIVE: To compare the corneal biomechanics, intraocular pressure (IOP), and central corneal thickness (CCT) of 37 patients with pediatric noninfectious uveitis with 36 healthy children. METHODS: Corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann-correlated and corneal-compensated IOP (IOPg and IOPcc, respectively), and CCT were measured. RESULTS: The mean CRF was significantly lower in the pediatric uveitic eyes than controls (9...
December 27, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/29283679/influence-of-short-term-orthokeratology-to-corneal-tangent-modulus-a-randomized-study
#17
Andrew Kc Lam, Stanley Yy Leung, Ying Hon, Lu Shu-Ho, Kit-Ying Wong, Pui-Kwan Tiu, David Cc Lam
PURPOSE: Influence of orthokeratology on corneal biomechanics is equivocal using Ocular Response Analyzer, ORA. Implementing indentation method, corneal tangent modulus was measured and monitored in short-term orthokeratology. MATERIALS AND METHODS: Sixteen young subjects with refractive errors between -4D to -5D sphere and astigmatism within -1.50D were recruited. One randomly selected eye wore orthokeratology lens (treatment), and the fellow eye wore conventional rigid gas permeable lens (control)...
April 2018: Current Eye Research
https://www.readbyqxmd.com/read/29251401/corneal-hysteresis-and-anterior-segment-optical-coherence-tomography-anatomical-parameters-in-primary-angle-closure-suspects
#18
Syed Amal Hussnain, Kyle D Kovacs, Joshua L Warren, Christopher C Teng
IMPORTANCE: Corneal hysteresis (CH) is a dynamic marker of structural and functional changes in the cornea associated with intraocular pressure (IOP) and central corneal thickness, but its utility in assessing primary angle closure suspects (PACS) has not been fully elucidated. BACKGROUND: This study assesses if anterior segment measurements correlate with CH in PACS patients. DESIGN: IRB-approved retrospective review of imaging and records at a university practice...
December 18, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/29235544/relationship-of-corneal-hysteresis-and-optic-nerve-parameters-in-healthy-myopic-subjects
#19
Kunliang Qiu, Xuehui Lu, Riping Zhang, Geng Wang, Mingzhi Zhang
The association between corneal biomechanical properties and glaucoma is an area of much interest. We determined the relationship between corneal hysteresis (CH) and optic nerve parameters in healthy myopic subjects in the current study. CH was measured with Reichert Ocular Response Analyzer in 108 eyes from 108 healthy myopic subjects. All subjects received retinal nerve fiber layer and optic disc imaging Cirrus HD-OCT, GDx ECC, and Heidelberg Retina Tomograph II. None of the tested optic nerve parameters showed statistical significance with CH by using correlation analysis...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29200820/the-effect-of-flap-thickness-on-corneal-biomechanics-after-myopic-laser-in-situ-keratomileusis-using-the-m-2-microkeratome
#20
Iyad A Goussous, Mohamed-Sameh El-Agha, Ahmed Awadein, Mohamed H Hosny, Alaa A Ghaith, Ahmed L Khattab
Purpose: The purpose of this study was to determine the effect of flap thickness on corneal biomechanics after myopic laser in situ keratomileusis (LASIK). Methods: This is a prospective controlled non-randomized, institutional study. Patients underwent either epi-LASIK with mitomycin (advanced surface ablation [ASA]), thin-flap LASIK (90 µm head), or thick-flap LASIK (130 µm head). In ASA, the Moria Epi-K hydroseparator was used. LASIK flaps were created using the Moria M-2 mechanical microkeratome...
2017: Clinical Ophthalmology
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