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Corneal Hysteresis

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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
#1
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
#2
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
#3
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
#4
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)...
January 25, 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
#5
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
#6
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 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...
January 2, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29297099/assessment-of-corneal-biomechanical-properties-with-inflation-test-using-optical-coherence-tomography
#7
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...
January 2, 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
#8
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
#9
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)...
December 28, 2017: Current Eye Research
https://www.readbyqxmd.com/read/29251401/corneal-hysteresis-and-anterior-segment-optical-coherence-tomography-anatomical-parameters-in-primary-angle-closure-suspects
#10
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 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
#11
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
#12
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
https://www.readbyqxmd.com/read/29160542/corneal-biomechanical-features-in-patients-with-ankylosing-spondylitis
#13
Kubra Serefoglu Cabuk, Emine Isil Üstün, Kursat Atalay, Ahmet Kirgiz, Rukiye Aydin
PURPOSE: To evaluate the corneal biomechanical features and central corneal thickness in ankylosing spondylitis patients and to evaluate correlations of these parameters with disease activity. METHODS: The study included 51 patients diagnosed with ankylosing spondylitis (mean age, 40.80 ± 13.15 years; range, 18-72 years) and 34 age- and sex-matched healthy controls (mean age, 42.00 ± 12.32 years; range, 18-60 years). All underwent a complete ophthalmological and physical examination, including visual acuity testing and biomicroscopic anterior and posterior segment examinations...
September 2017: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/29104870/age-related-variations-of-rabbit-corneal-geometrical-and-clinical-biomechanical-parameters
#14
Haixia Zhang, Xiao Qin, Xiaomeng Cao, Di Zhang, Lin Li
Purpose: To study the variations in corneal clinical biomechanical parameters (CCBP) and corneal geometrical parameters of rabbit in relation to age. Methods: Rabbits aged 3, 7, 12, 18, and 24 months were enrolled. Each eye of the rabbits was tested with Ocular Response Analyzer (ORA), Optical Coherence Tomography (OCT), and Pachymeter to obtain the intraocular pressure (IOP): Goldmann-correlated IOP (IOPg) and Corneal Compensated Intraocular Pressure (IOPcc); CCBP: Corneal Hysteresis (CH) and Corneal Resistance Factor (CRF); corneal geometric parameters: corneal curvature radius (CCR) and central corneal thickness (CCT)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29082447/impact-of-herpetic-stromal-immune-keratitis-in-corneal-biomechanics-and-innervation
#15
Manuel Ángel Marcos-Fernández, Sara Sánchez Tabernero, Jose María Herreras, David José Galarreta
PURPOSE: To study corneal innervation in eyes with history of herpetic keratitis and its correlation with corneal sensitivity and biomechanical properties. METHODS: A total of 56 eyes were included, of which 16 had a history of unilateral immune stromal herpetic keratitis, 16 were their contralateral eyes, and 20 were healthy controls. Structural analysis of corneal nerve plexus was performed by confocal microscopy. Biomechanical properties were measured with the Ocular Response Analyzer...
October 29, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29081866/conventional-versus-accelerated-collagen-cross-linking-for-keratoconus-a-comparison-of-visual-refractive-topographic-and-biomechanical-outcomes
#16
Jyh Haur Woo, Jayant Venkatramani Iyer, Li Lim, M Htoon Hla, Jodhbir S Mehta, Cordelia Ml Chan, Donald Th Tan
OBJECTIVE: The aim was to compare the visual, refractive, topographic and biomechanical outcomes in patients with progressive keratoconus treated with either conventional or accelerated crosslinking at one year follow up. METHODS: It is a prospective, non-randomised interventional study of 76 patients who underwent conventional (CXL; 3mW/cm(2) for 30 minutes) or accelerated cross linking (KXL; 30mW/cm(2) for 4 minutes) for progressive keratoconus. Baseline and postoperative visual acuity, manifest refraction, corneal topography, pachymetry, endothelial cell density and biomechanical parameters of corneal hysteresis and corneal resistance factor were evaluated and compared...
2017: Open Ophthalmology Journal
https://www.readbyqxmd.com/read/29042748/corneal-biomechanical-properties-after-laser-assisted-in-situ-keratomileusis-and-photorefractive-keratectomy
#17
Eileen S Hwang, Brian C Stagg, Russell Swan, Carlton R Fenzl, Molly McFadden, Valliammai Muthappan, Luis Santiago-Caban, Mark D Mifflin, Majid Moshirfar
BACKGROUND: The purpose of this study was to evaluate the effects of laser-assisted in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) on corneal biomechanical properties. METHODS: We used the ocular response analyzer to measure corneal hysteresis (CH) and corneal resistance factor (CRF) before and after refractive surgery. RESULTS: In all, 230 eyes underwent LASIK and 115 eyes underwent PRK without mitomycin C (MMC). Both procedures decreased CH and CRF from baseline...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28980563/-changes-in-biomechanical-properties-of-the-ocular-fibrous-tunic-in-patients-with-primary-open-angle-glaucoma-in-response-to-drug-induced-stress-relief-tests
#18
N V Makashova, A E Vasilyeva
AIM: To determine the effect of drug-induced stress-relief tests on biomechanical properties of the ocular fibrous tunic in eyes with early, moderate, or advanced primary open-angle glaucoma (POAG). MATERIAL AND METHODS: A total of 202 eyes of 150 patients with POAG of different severity (early, moderate, or advanced) and 36 eyes of 30 healthy controls were examined. The mean patient age was 62±8.2 years. All groups were standardized by age, sex, and the range of corneal-compensated intraocular pressure (IOP) at baseline (21-30 mmHg)...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28945645/corneal-biomechanical-parameters-with-corneoscleral-contact-lenses-in-post-laser-in-situ-keratomileusis-eyes
#19
Juan C Montalt, Esteban Porcar, Enrique España-Gregori, Cristina Peris-Martínez
OBJECTIVE: To evaluate corneal biomechanical parameters wearing corneoscleral contact lenses (CScL) in patients with irregular corneas after laser in situ keratomileusis (LASIK). METHODS: Data from patients fitted with CScL because of corneal surface irregularities after complicated LASIK surgery were selected by two eye clinics. Previously and after 1 year of CScL fitting, corneal hysteresis (CH), corneal resistance factor (CRF), corneal-compensated intraocular pressure (IOPcc), and central corneal thickness were evaluated...
September 21, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28944205/clinical-outcomes-of-small-incision-lenticule-extraction-versus-femtosecond-laser-assisted-lasik-for-myopia-a-meta-analysis
#20
Huan Yan, Li-Yan Gong, Wei Huang, Yan-Li Peng
AIM: To evaluate the possible differences in visual quality between small incision lenticule extraction (SMILE) and femtosecond laser in situ keratomileusis (FS-LASIK) for myopia. METHODS: A Meta-analysis was performed. Patients were from previously reported comparative studies treated with SMILE versus FS-LASIK. The PubMed, EMBASE, Cochrane, Web of Science and Chinese databases (i.e. WANFANG and CNKI) were searched in Nov. of 2016 using RevMan 5.1 version software...
2017: International Journal of Ophthalmology
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