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Corneal Hysteresis

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https://www.readbyqxmd.com/read/28761329/comparison-of-different-intraocular-pressure-measurement-techniques-in-normal-eyes-and-post-small-incision-lenticule-extraction
#1
Mohamed Hosny, Fayrouz Aboalazayem, Hoda El Shiwy, Mohsen Salem
PURPOSE: The purpose of the study was to determine the accuracy of intraocular pressure (IOP) measurement after small incision lenticule extraction (SMILE) using Goldmann applanation tonometry (GAT) and ocular response analyzer (ORA). METHODS: This is a prospective clinical study that was conducted on 30 eyes in the interval between February 2016 and September 2016. The age of the patients ranged between 19 and 40 years. The patients underwent SMILE surgery using the femto laser...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28756375/anterior-posterior-and-biomechanical-parameters-of-cornea-during-pregnancy-in-healthy-eyes-a-cohort-study
#2
Mohammad Naderan, Ali Jahanrad
BACKGROUND: To investigate the effect of pregnancy on anterior, posterior and biomechanical corneal parameters of healthy eyes. METHOD: In this prospective cohort study, 70 pregnant participants with clinically healthy eyes underwent corneal topographic imaging evaluation by Pentacam and biomechanical assessment by Ocular Response Analyzer (ORA) before pregnancy, at the third trimester of pregnancy (34th week of pregnancy) and 12 months after delivery. The same number of age-matched non-pregnant females was evaluated at the corresponding appointments as the control group...
July 29, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28745654/-analysis-of-corneal-biomechanical-changes-after-femtosecond-laser-assisted-laser-in-situ-keratomileusis-in-children-with-hyperopic-anisometropia
#3
I L Kulikova, O V Shlenskaya, N V Chapurin
AIM: to analyze corneal hysteresis (CH) and corneal resistance factor (RF) readings obtained with the Reichert Ocular Response Analyzer (ORA) before and after hyperopic femtolaser-assisted laser in situ keratomileusis (FS-LASIK) in children with anisometropia as well as to establish factors that may cause changes in these parameters. MATERIAL AND METHODS: CH and RF were evaluated before and 1.5 years after FS-LASIK performed on amblyopic eyes of 28 patients aged 6-14 years...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28664236/alterations-in-biomechanical-properties-of-the-cornea-among-patients-with-polycystic-kidney-disease
#4
Kubra Serefoglu Cabuk, Bennur Esen, Kursat Atalay, Ahmet Kirgiz, Rukiye Aydin
PURPOSE: The aim of this study was to evaluate the corneal biomechanical features in polycystic kidney disease (PKD) patients and compare them with the healthy individuals. METHODS: Totally 81 patients with a mean age of 48.46 ± 14.51 years and 60 control cases with a mean age of 44.68 ± 12.69 years were included in the study. All of the subjects underwent a complete ophthalmological examination, including visual acuity testing, biomicroscopic anterior and posterior segment examinations...
June 29, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28626602/association-between-corneal-biomechanical-properties-with-ocular-response-analyzer-and-also-corvisst-tonometry-and-glaucomatous-visual-field-severity
#5
Kazunori Hirasawa, Masato Matsuura, Hiroshi Murata, Shunsuke Nakakura, Yoshitaka Nakao, Yoshiaki Kiuchi, Ryo Asaoka
PURPOSE: To investigate the association between corneal biomechanical properties measured with the Ocular Response Analyzer (ORA) and also CorvisST (CST) tonometry, and glaucomatous visual field (VF) severity. METHODS: One hundred forty-six eyes of 91 patients with primary open-angle glaucoma who performed Humphrey Field Analyzer 30-2 or 24-2 SITA-Standard, ORA, and CST within 180 days were included in this multicentral, observational cross-sectional study. The association between ORA parameters (corneal hysteresis [CH] and corneal resistant factor [CRF]), CST parameters (A1 and A2 time, A1 and A2 length, A1 and A2 velocity, A1 and A2 deformation amplitude, highest deformation amplitude, highest concavity time, peak distance, and radius), and other basic parameters (age, intraocular pressure with Goldmann applanation tonometry, central corneal thickness, and axial length) against mean total deviation (mTD) were analyzed using a linear mixed-model and model selection with corrected Akaike Information Criterion (AICc)...
June 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28540493/investigation-of-corneal-biomechanics-at-moderate-to-high-refractive-errors
#6
Nehir İnceoğlu, Sinan Emre, Mahmut Oğuz Ulusoy
PURPOSE: Corneal hysteresis (CH) and corneal resistance factor (CRF) are corneal biomechanical parameters which were measured by ocular response analyzer (ORA). Aim of this study was to define the CH and CRF in high myopic and hyperopic patients and compare the results with emmetropic control group. METHODS: A total of 193 eyes of 100 healthy volunteers were included. Study groups were high myopic patients (n = 27) with spherical refractive errors (SRE) of greater than -5...
May 24, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28501948/corneal-tomography-and-biomechanics-in-primary-pterygium
#7
M Vanathi, Sahil Goel, Anita Ganger, Tushar Agarwal, T Dada, Sudarshan Khokhar
PURPOSE: To study the Scheimpflug's imaging and corneal biomechanics in primary pterygium. METHODS: A prospective observational study of 55 patients with unilateral primary nasal pterygium was done. The normal fellow eyes of patients with pterygium were taken as controls. Clinical parameters noted included visual acuity, values of corneal curvature by doing Scheimpflug imaging, wavefront aberrations in terms of higher and lower-order aberrations and corneal hysteresis (CH) as well as corneal resistance factor (CRF) values by using ocular response analyzer...
May 13, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28496302/goldmann-tonometer-error-correcting-prism-clinical-evaluation
#8
Sean McCafferty, Garrett Lim, William Duncan, Eniko T Enikov, Jim Schwiegerling, Jason Levine, Corin Kew
PURPOSE: Clinically evaluate a modified applanating surface Goldmann tonometer prism designed to substantially negate errors due to patient variability in biomechanics. METHODS: A modified Goldmann prism with a correcting applanation tonometry surface (CATS) was mathematically optimized to minimize the intraocular pressure (IOP) measurement error due to patient variability in corneal thickness, stiffness, curvature, and tear film adhesion force. A comparative clinical study of 109 eyes measured IOP with CATS and Goldmann prisms...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28489806/the-relationship-between-corneal-biomechanics-and-anterior-segment-parameters-in-the-early-stage-of-orthokeratology-a-pilot-study
#9
Renai Chen, Xinjie Mao, Jun Jiang, Meixiao Shen, Yan Lian, Bin Zhang, Fan Lu
To investigate the relationship between corneal biomechanics and anterior segment parameters in the early stage of overnight orthokeratology.Twenty-three eyes from 23 subjects were involved in the study. Corneal biomechanics, including corneal hysteresis (CH) and corneal resistance factor (CRF), and parameters of the anterior segment, including corneal curvature, central corneal thickness (CCT), and corneal sublayers' thickness, were measured at baseline and day 1 and 7 after wearing orthokeratology lens. One-way analysis of variance with repeated measures was used to compare the longitudinal changes and partial least squares linear regression was used to explore the relationship between corneal biomechanics and anterior segment parameters...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28486315/comparison-of-2-different-methods-of-transepithelial-corneal-collagen-cross-linking-analysis-of-corneal-histology-and-hysteresis
#10
Young Min Park, Ho Yoon Kim, Jong Soo Lee
PURPOSE: To compare the effect of 2 different methods of transepithelial corneal collagen cross-linking (CXL) on corneal histology and hysteresis. METHODS: The right eyes of New Zealand white rabbits (n = 50) were treated using one of the 2 transepithelial CXL methods. The eyes were then divided into 2 groups: group 1, transepithelial CXL using continuous ultraviolet A (UVA); group 2, accelerated transepithelial CXL using pulsed UVA. RESULTS: Both groups showed a postoperative increase in central corneal thickness...
July 2017: Cornea
https://www.readbyqxmd.com/read/28461014/comparison-of-corneal-biomechanical-properties-between-indian-and-chinese-adults
#11
Jacqueline Chua, Monisha E Nongpiur, Wanting Zhao, Yih Chung Tham, Preeti Gupta, Charumathi Sabanayagam, Tin Aung, Tien Yin Wong, Ching-Yu Cheng
PURPOSE: To investigate the difference in corneal hysteresis (CH) and corneal resistance factor (CRF) between Indian and Chinese populations. DESIGN: Population-based cross-sectional study. PARTICIPANTS: Three hundred eighty-two Singaporean Indian persons and 764 Singaporean Chinese 50 years of age or older were included from the Singapore Indian Eye Study and Singapore Chinese Eye Study, respectively. METHODS: Participants underwent standardized systemic and ocular examinations and interviewer-administered questionnaires for risk factor assessment...
April 28, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28430332/relationship-between-corneal-biomechanical-properties-and-optic-nerve-head-changes-after-deep-sclerectomy
#12
Laura Díez-Álvarez, Francisco J Muñoz-Negrete, Pilar Casas-Llera, Noelia Oblanca, Victoria de Juan, Gema Rebolleda
PURPOSE: To evaluate corneal biomechanical properties and optic nerve head (ONH) changes following deep sclerectomy (DS) and the relation to each other. METHODS: Forty-nine eyes with primary open-angle glaucoma that underwent DS were studied. Corneal biomechanical properties were assessed using the Ocular Response Analyzer and the ONH was evaluated by Spectralis optical coherence tomography with enhanced depth imaging technology before surgery and 3 months postoperatively...
April 4, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28351927/factors-influencing-intraocular-pressure-corneal-thickness-and-corneal-biomechanics-after-congenital-cataract-surgery
#13
Amir Faramarzi, Sepehr Feizi, Ali Maghsoodlou
AIMS: This study aims to compare intraocular pressure (IOP), central corneal thickness (CCT) and corneal biomechanics among patients with aphakia, patients with primary and secondary pseudophakia and matched controls following congenital cataract surgery and to investigate the factors influencing these variables. METHODS: This study included 36 aphakic eyes, 47 primary pseudophakic eyes and 30 secondary pseudophakic eyes. Thirty-four normal eyes of matched volunteers were recruited for comparisons...
March 28, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28337056/normative-values-and-contralateral-comparison-of-anterior-chamber-parameters-measured-by-pentacam-and-its-correlation-with-corneal-biomechanical-factors
#14
Mohammad Reza Sedaghat, Vahid Mohammad Zadeh, Kaveh Fadakar, Sakineh Kadivar, Mojtaba Abrishami
PURPOSE: To evaluate the normative values of anterior chamber parameters measured by Pentacam and corneal hysteresis (CH) and corneal resistance factor (CRF) measured by Ocular Response Analyzer (ORA) and their relationship. METHODS: In an observational cross-sectional study, patients aged 18-35 years were included. Exclusion criteria were history of any intraocular or corneal disease, anomaly or surgery; hyperopic spherical refraction more than +3, and myopic spherical refraction less than -5...
January 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28316192/-effect-of-optical-zone-diameter-on-corneal-biomechanical-properties-after-small-incision-lenticule-extraction
#15
P H Wei, Y Wang, H Li, R Dou, L Y Li, W Zhao, J M Zhang
Objective: To investigate the effect of optical zone diameter on corneal biomechanical properties after small incision lenticule extraction (SMILE). Methods: In this prospective case-control study, 62 eyes of 42 patients with myopia and myopic astigmatism that had undergone SMILE procedure were divided into 2 groups according to the optical zone (OZ) diameter: group A, 31 eyes of 19 patients, OZ= 6.5 mm; group B, 31eyes of 23 patients, OZ=6.0 mm. These patients were examined for corneal hysteresis (CH) and corneal resistance factor (CRF) with the Ocular Response Analyzer (ORA) preoperatively and at 1 week, 1 month and 3 months postoperatively; at the same time, the central corneal thickness-corrected indices of DifCH and DifCRF were calculated...
March 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28287858/the-effect-of-pterygium-and-pterygium-surgery-on-corneal-biomechanics
#16
Mustafa Koç, Fuat Yavrum, Mehmet Murat Uzel, Emre Aydemir, Kemal Özülken, Pelin Yılmazbaş
PURPOSE: To evaluate the effect of pterygium and pterygium surgery on corneal biomechanics by ocular response analyzer (ORA, Reichert, USA). METHODS: This study considered 68 eyes (from 34 patients with a mean age of 21.2±7.1 years) with unilateral nasal, primary pterygium (horizontal length <4 mm), and having undergone pterygium excision and conjunctival autografting. Pterygium length and area were measured from a photograph of the anterior segment using Image J program...
March 13, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/28260366/-application-value-of-corneal-hysteresis-in-diagnosis-and-treatment-of-glaucoma
#17
REVIEW
L Y He, L Liang, M N Zhu
Glaucoma is the first leading cause of irreversible blindness world widely, but the pathogenesis was still unclear. The collagen fibers from cornea and sclera connect to each other and both of them have similar extracellular matrix components. The biomechanical characteristics of optic nerve lamina cribrosa may associated with the biomechanical properties of the cornea. Therefore, the study of corneal physiological can indirectly reflex the compression and damage in optic nerve lamina cribrosa. The technical developments in corneal hysteresis examination had been updated these years constantly...
February 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28255839/impact-of-dehydration-and-fasting-on-intraocular-pressure-and-corneal-biomechanics-measured-by-the-ocular-response-analyzer
#18
Betul Seher Uysal, Necati Duru, Umut Ozen, Mucella Arikan Yorgun, Emine Akcay, Mehtap Caglayan, Nurullah Cagil
PURPOSE: To investigate the effects of dehydration and fasting on the intraocular pressure (IOP) and corneal biomechanics during Ramadan in healthy subjects. METHODS: A total of 36 healthy fasting male volunteers with a mean age of 32.7 ± 5.1 years (range 28-38 years) were enrolled in the study. A Reichert Ocular Response Analyzer (ORA) was used to measure the corneal resistance factor (CRF), corneal hysteresis (CH), Goldman-correlated IOP (IOPg), and corneal-compensated IOP (IOPcc), additionally IOP with Goldmann applanation tonometer (IOP-GAT) was taken...
March 2, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28210179/corneal-biomechanics-in-normal-saudi-individuals
#19
Khalid Al-Arfaj, Sanaa A Yassin, Walaa Al-Dairi, Fatimah Al-Shamlan, Mohanna Al-Jindan
PURPOSE: The aim of this study was to determine and relate corneal biomechanical metrics with demographic, tomographic and refractive data in healthy Saudi people. DESIGN: Prospective, cross-sectional, observational study. PARTICIPANTS: The study included 215 normal Saudi adult individuals. METHODS: Corneal hysteresis (CH) and corneal resistance factor (CRF), Goldmann-correlated intraocular pressure (IOPg) and corneal-compensated intraocular pressure (IOPcc) were measured by ocular response analyzer...
July 2016: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28192588/conventional-versus-inverted-side-cut-flaps-for-femtosecond-laser-assisted-lasik-laboratory-and-clinical-evaluation
#20
Vishal Jhanji, Tommy C Y Chan, Wai Ying Li, Rayne R Lim, Marco C Y Yu, Kasin Law, Peng Yi, Yolanda W Y Yip, Yumeng Wang, Tsz Kin Ng, Shyam S Chaurasia, Rajiv R Mohan
PURPOSE: To study the differences in early corneal cellular events and biomechanical properties after femtosecond laser-assisted LASIK performed using conventional or inverted side-cut angles. METHODS: In the laboratory study, left eyes of 24 rabbits underwent LASIK flap creation with a 70° or 115° side-cut. The contralateral eyes served as controls. The corneas were harvested 24 hours postoperatively. In the clinical study, 2 eyes of each patient (n = 29) were randomized to corneal flap creation with 70° or 115° side-cut angles during LASIK...
February 1, 2017: Journal of Refractive Surgery
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