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Corneal Hysteresis

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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
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/28891725/age-related-change-in-corneal-biomechanical-parameters-in-a-healthy-caucasian-population
#4
Ali Riza Cenk Celebi, Ayse Ebru Kilavuzoglu, Ugur Emrah Altiparmak, C Banu Cosar Yurteri
PURPOSE: To determine the effect of aging on corneal biomechanical parameters measured via ocular response analyzer in a homogenous healthy Caucasian population. METHODS: A total of 2039 Caucasian adults were consecutively recruited and divided into seven groups according to decades of age. The difference in mean corneal hysteresis (CH), mean corneal resistance factor (CRF), mean Goldmann-correlated intraocular pressure (IOPg), and mean corneal-compensated IOP (IOPcc) between decades of age were investigated...
September 11, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28880332/a-technique-to-reduce-incidence-of-opaque-bubble-layer-formation-during-lasik-flap-creation-using-the-visumax-femtosecond-laser
#5
Ningling Wu, Joseph G Christenbury, Jon G Dishler, Tahir Kansu Bozkurt, Daniel Duel, Lijun Zhang, D Rex Hamilton
PURPOSE: To identify risk factors for opaque bubble layer (OBL) formation and compare the incidence of OBL using a cone modification technique versus the original technique for LASIK flap creation using the VisuMax laser (Carl Zeiss Meditec, Jena, Germany). METHODS: This retrospective study examined videos of flap creation using the VisuMax laser to identify OBL occurrence. Eyes were divided into three groups: eyes where OBL occurred using the original technique (OBL group), eyes where OBL did not occur using the original technique (no OBL group), and eyes in which the cone modification technique was used for LASIK flap creation (larger flap diameter) (cone modification technique group)...
September 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28858045/corneal-hysteresis-is-reduced-in-obstructive-sleep-apnea-syndrome
#6
Suchitra Nadarajah, Amir Samsudin, Norlina Ramli, Chong Tin Tan, Zahari Mimiwati
SIGNIFICANCE: To our knowledge, this is the first time a study looking at the association between corneal hysteresis (CH) and obstructive sleep apnea syndrome (OSAS) severity has been reported. We provide evidence that CH is lower in OSAS and speculate on the possible causes. PURPOSE: The present study aims to look at the association between CH and severity of OSAS, and whether CH could be another link between OSAS and the development of glaucoma. METHODS: This was a cross-sectional, observational study at the University Malaya Medical Centre, Kuala Lumpur...
October 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28832734/corneal-properties-and-glaucoma-a-review-of-the-literature-and-meta-analysis
#7
REVIEW
Ricardo Gaspar, Luís Abegão Pinto, David Cordeiro Sousa
PURPOSE: Studies have suggested that corneal biomechanical properties influence intraocular pressure (IOP) measurements, namely central corneal thickness (CCT) and corneal hysteresis (CH). The present study aimed to investigate the associations of CH and CCT with glaucoma development. METHODS: We performed a review of the literature and meta-analysis of observational studies (2006-2016) that included both adult glaucoma patients and controls and reported CCT and CH as outcomes...
June 2017: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/28761329/comparison-of-different-intraocular-pressure-measurement-techniques-in-normal-eyes-and-post-small-incision-lenticule-extraction
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
COMPARATIVE STUDY
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...
September 2017: Ophthalmology
https://www.readbyqxmd.com/read/28430332/relationship-between-corneal-biomechanical-properties-and-optic-nerve-head-changes-after-deep-sclerectomy
#19
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...
August 30, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28351927/factors-influencing-intraocular-pressure-corneal-thickness-and-corneal-biomechanics-after-congenital-cataract-surgery
#20
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
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