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Corneal Hysteresis

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https://www.readbyqxmd.com/read/27893094/comparison-of-patient-specific-computational-modeling-predictions-and-clinical-outcomes-of-lasik-for-myopia
#1
Ibrahim Seven, Ali Vahdati, Vinicius Silbiger De Stefano, Ronald R Krueger, William J Dupps
Purpose: To assess the predictive accuracy of simulation-based LASIK outcomes. Methods: Preoperative and 3-month post-LASIK tomographic data from 20 eyes of 12 patients who underwent wavefront-optimized LASIK for myopia were obtained retrospectively. Patient-specific finite element models were created and case-specific treatment settings were simulated. Simulated keratometry (SimK) values and the mean tangential curvature of the central 3 mm (Kmean) were obtained from the anterior surfaces of the clinical tomographies, and computational models were compared...
November 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27873338/high-myopes-have-lower-normalised-corneal-tangent-moduli-less-stiff-corneas-than-low-myopes
#2
Ying Hon, Guo-Zhen Chen, Shu-Hao Lu, David C C Lam, Andrew K C Lam
PURPOSE: To compare corneal tangent moduli between low and high myopes. METHODS: Corneal hysteresis (CH) and corneal resistance factor (CRF) of 32 low and 32 high myopes were obtained using an Ocular Response Analyzer, followed by a corneal indentation device that measured corneal stiffness. Corneal topography, pachymetry, Goldmann applanation tonometry intraocular pressure (GAT-IOP), and corneal compensated intraocular pressure (IOPcc) were also obtained. Corneal tangent modulus was calculated on the basis of corneal stiffness, central corneal thickness and corneal radius...
November 21, 2016: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/27847644/relationship-among-corneal-biomechanics-anterior-segment-parameters-and-geometric-corneal-parameters
#3
Sadık Görkem Çevik, Sertaç Argun Kıvanç, Berna Akova-Budak, Mediha Tok-Çevik
Purpose. To investigate the relationship between corneal biomechanical parameters, anterior segment parameters, and geometric corneal parameters in a healthy Caucasian group. Methods. This retrospective study included the healthy eyes with best corrected visual acuity of at least 20/40 of 122 Caucasian subjects. The anterior segment parameters and geometric corneal parameters such as corneal volume, central corneal thickness, horizontal and vertical corneal radii, anterior and posterior steep, and flat keratometric values were measured with a Scheimpflug camera...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27830201/corneal-biomechanics-after-small-incision-lenticule-extraction-versus-q-value-guided-femtosecond-laser-assisted-in-situ-keratomileusis
#4
Jun Zhang, Li Zheng, Xia Zhao, Yang Xu, Shu Chen
PURPOSE: The aim of this study was to compare the changes in corneal biomechanical properties following small-incision lenticule extraction (SMILE) versus Q-value-guided femtosecond laser-assisted in situ keratomileusis (Q-FS-LASIK). METHODS: In this prospective comparative study, patients with a sphere plus cylinder measurement of less than -10.00 D and cylinder measurement of less than -5.00 D were included in the study. A total of 160 patients (160 eyes) with myopia and myopic astigmatism were divided into the two groups, with 80 patients (80 eyes) allocated to SMILE and 80 patients (80 eyes) allocated to Q-FS-LASIK...
December 2016: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/27803856/effect-of-femtosecond-and-microkeratome-flaps-creation-on-the-cornea-biomechanics-during-laser-in-situ-keratomileusis-one-year-follow-up
#5
Qian Sun, Zheng-Zheng Deng, Yue-Hua Zhou, Jing Zhang, Xiao-Yan Peng
AIM: To compare the corneal biomechanical outcomes at one year after laser in situ keratomileusis (LASIK) with the flaps created by Ziemer and Moria M2 microkeratome with 110 head and -20 blade. METHODS: Totally 100 eyes of 50 consecutive patients were enrolled in this prospective study and divided into two groups for corneal flaps created by ZiemerFemto LDV and Moria M2 microkeratome with 110 head and -20 blade. Corneal biomechanical properties including cornea resistance factor (CRF) and cornea hysteresis (CH) were measured before and 1, 3, 6, 12mo after surgery by ocular response analyzer...
2016: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/27800259/comparison-of-changes-in-corneal-biomechanical-properties-after-photorefractive-keratectomy-and-small-incision-lenticule-extraction
#6
Yusuf Yıldırım, Onur Ölçücü, Abdurrahman Başcı, Alper Ağca, Engin Bilge Özgürhan, Cengiz Alagöz, Ali Demircan, Ahmet Demirok
OBJECTIVES: To compare the postoperative biomechanical properties of the cornea after photorefractive keratectomy (PRK) and small incision lenticule extraction (SMILE) in eyes with low and moderate myopia. MATERIALS AND METHODS: We retrospectively examined 42 eyes of 23 patients undergoing PRK and 42 eyes of 22 patients undergoing SMILE for the correction of low and moderate myopia. Corneal hysteresis (CH) and corneal resistance factor (CRF) were measured with an Ocular Response Analyzer before and 6 months after surgery...
April 2016: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/27781383/topographic-tomographic-and-biomechanical-corneal-changes-during-pregnancy-in-patients-with-keratoconus-a-cohort-study
#7
Mohammad Naderan, Ali Jahanrad
PURPOSE: This study aimed at evaluating the effect of pregnancy on topographic, tomographic and biomechanical parameters of patients with keratoconus (KC) in comparison with non-pregnant patients with KC. METHOD: In a cohort study, patients with KC, whose disease was stable for at least 2 years, were evaluated before pregnancy, at their third trimester of pregnancy (34th week of pregnancy) and 6 months after pregnancy. As the control group, an equivalent number of age- and severity-matched non-pregnant female patients with KC were evaluated at the corresponding times...
October 26, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27709370/biomechanical-evaluation-of-cornea-in-patients-with-ankylosing-spondylitis
#8
Mehtap Caglayan, Ozge Sarac, Pinar Kosekahya, Sukran Erten, Berna Ayan, Nurullah Cagil
PURPOSE: The aim of this study was to evaluate the corneal biomechanical parameters in patients with ankylosing spondylitis (AS) and to compare them with the healthy subjects. METHODS: Sixty patients with AS (study group) and 60 healthy subjects (control group) were enrolled in this prospective study. The study group was further classified as active (n:30) and inactive (n:30). After detailed ophthalmological examination including intraocular pressure (IOP) measurement with Goldmann applanation tonometer (IOPGAT), corneal hysteresis (CH), corneal resistance factor (CRF), corneal-compensated IOP (IOPcc), and Goldmann-correlated IOP (IOPg) were measured with the Reichert Ocular Response Analyzer (ORA)...
October 5, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/27703662/in-vivo-evaluation-of-the-biomechanical-properties-of-optic-nerve-and-peripapillary-structures-by-ultrasonic-shear-wave-elastography-in-glaucoma
#9
Atilla Suleyman Dikici, Ismail Mihmanli, Fahrettin Kilic, Ahmet Ozkok, Gokhan Kuyumcu, Pinar Sultan, Cesur Samanci, Mehmet Halit Yilmaz, Babak Rafiee, Nevbahar Tamcelik, Zehra Isik Hasiloglu, Fatih Kantarci
BACKGROUND: Primary open-angle glaucoma is a multifactorial serious disease characterized by progressive retinal ganglion cell death and loss of visual field. OBJECTIVES: The purposes of this study were to investigate shear wave elastography (SWE) use in the evaluation of the optic nerve (ON) and peripapillary structures, and to compare the findings between glaucomatous and control eyes. PATIENTS AND METHODS: A case-controlled study, including 21 patients with primary open-angle glaucoma and 21 age-matched control subjects, was carried out...
April 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27688908/corneal-biomechanical-findings-in-contact-lens-induced-corneal-warpage
#10
Fateme Alipour, Mojgan Letafatnejad, Amir Hooshang Beheshtnejad, Seyed-Farzad Mohammadi, Seyed Reza Ghaffary, Narges Hassanpoor, Mehdi Yaseri
Purpose. To evaluate the difference in biomechanical properties between contact lens induced corneal warpage and normal and keratoconic eyes. Method. Prospective observational case control study, where 94 eyes of 47 warpage suspicious and 46 eyes of 23 keratoconic patients were included. Warpage suspected cases were followed until a definite diagnosis was made (warpage, normal, or keratoconus). Results. 44 eyes of 22 patients had contact lens related corneal warpage. 46 eyes of 23 people were diagnosed as nonwarpage normal eyes...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27628484/correlating-corneal-biomechanics-and-ocular-biometric-properties-with-lamina-cribrosa-measurements-in-healthy-subjects
#11
Francisco Pérez Bartolomé, Jose María Martínez de la Casa, Irene Camacho Bosca, Federico Sáenz-Francés, Soledad Aguilar Munoa, Alberto Martín Juan, Julian Garcia-Feijoo
PURPOSE: To examine interrelations between corneal biomechanics, ocular biometric variables and optic disc size (ODS), lamina cribosa depth (LCD) or thickness (LCT) in a healthy population. MATERIAL AND METHODS: In a cross-sectional case-control study, the following measurements were made in 81 eyes of 81 participants: axial length, anterior chamber depth, lens thickness, and central corneal thickness using the optical biometer Lenstar LS900; and corneal hysteresis (CH), corneal resistance factor (CRF), Goldman-correlated intraocular pressure (IOPg), and corneal-compensated IOP (IOPcc) using the Ocular Response Analyzer...
September 14, 2016: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/27600891/-intraocular-pressure-ocular-blood-flow-and-corneal-biomechanics-changes-after-lasik-surgery-for-myopia
#12
S E Avetisov, V R Mamikonyan, O A Shmeleva-Demir, A A Karamyan, I A Bubnova, E E Kazaryan, N S Galoyan, A T Karapetyan
AIM: to study changes in intraocular pressure (IOP), volumetric ocular blood flow (OBF) rate, and biomechanical properties of the cornea after excimer laser ablation in patients with myopia of different degrees. MATERIAL AND METHODS: A total of 16 patients (32 eyes) with myopia ranging from 2.75 to 9.0 D were examined before and after LASIK. Ocular Blood Flow Analyzer (OBFA) was used to measure IOP and OBF as well as pulse amplitude and volume. Ocular Response Analyzer (ORA) was also employed to provide the following data: Goldmann-equivalent IOP, corneal compensated IOP, corneal hysteresis, and corneal resistance factor...
July 2016: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/27599176/differences-in-corneal-biomechanics-in-nonpenetrating-deep-sclerectomy-and-deep-sclerectomy-reconverted-into-trabeculectomy
#13
Alfonso Casado, Carmen Cabarga, Ane Pérez-Sarriegui, Enrique Fuentemilla
PURPOSE: To evaluate the differences in intraocular pressure (IOP) and in corneal biomechanics in eyes with uneventful nonpenetrating deep sclerectomy (NPDS) in 1 eye and with intended deep sclerectomy reconverted into trabeculectomy (RIT) in the fellow eye of the same patient. PARTICIPANTS: Forty eyes of 20 patients with both types of glaucoma surgery and more than 6 months of follow-up, and 31 eyes of 50 controls. METHODS: IOP was assessed with Goldmann applanation tonometry (GAT), ocular response analizer (ORA), and dynamic contour tonometer (DCT)...
September 2, 2016: Journal of Glaucoma
https://www.readbyqxmd.com/read/27580243/the-relationship-between-corvis-st-tonometry-and-ocular-response-analyzer-measurements-in-eyes-with-glaucoma
#14
Masato Matsuura, Kazunori Hirasawa, Hiroshi Murata, Mieko Yanagisawa, Yoshitaka Nakao, Shunsuke Nakakura, Yoshiaki Kiuchi, Ryo Asaoka
It is important to compare the results of Corneal Visualization Scheimpflug Technology instrument (CST) measurements and Reichert Ocular Response Analyzer (ORA) parameters. The purpose of the study was to investigate the association between CST measurements and ORA parameters in ninety-five patients with primary open-angle glaucoma. Measurements of CST, ORA, axial length (AL), average corneal curvature (CC), central corneal thickness (CCT) and intraocular pressure (IOP) with Goldmann applanation tonometry (GAT) were carried out...
2016: PloS One
https://www.readbyqxmd.com/read/27579455/age-related-variations-in-corneal-biomechanical-properties
#15
Farideh Sharifipour, Mahmoodreza Panahi-Bazaz, Roghayeh Bidar, Aida Idani, Bahman Cheraghian
PURPOSE: To determine age-related changes in corneal viscoelastic properties in healthy individuals. METHODS: This observational cross-sectional study was performed at the Department of Ophthalmology, Imam Khomeini Hospital, Ahvaz, Iran and included 302 healthy individuals in 6 age decades (range: 10-69 years). After complete ocular examination, corneal viscoelastic properties were measured by ocular response analyzer and central corneal thickness (CCT) by an ultrasonic pachymeter...
September 2016: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/27573413/structural-and-biomechanical-corneal-differences-between-patients-suffering-from-primary-congenital-glaucoma-and-healthy-volunteers
#16
Lucía Perucho-González, Federico Sáenz-Francés, Laura Morales-Fernández, José María Martínez-de-la-Casa, Carmen D Méndez-Hernández, Enrique Santos-Bueso, John L Brookes, Julián García-Feijoó
PURPOSE: To determine whether a set of ocular morphometric and biomechanical variables are able to discriminate between healthy volunteers and patients suffering from primary congenital glaucoma (PCG). METHODS: Case-control study in which 66 patients with PCG and 94 age-matched healthy subjects were evaluated using ocular response analyser (ORA) to record corneal biomechanical properties. Topographic corneal variables were obtained using the Pentacam in both groups...
August 29, 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27548888/intraocular-pressure-changes-and-relationship-with-corneal-biomechanics-after-smile-and-fs-lasik
#17
Hua Li, Yan Wang, Rui Dou, Pinghui Wei, Jiamei Zhang, Wei Zhao, Liuyang Li
PURPOSE: The purpose of this article was to evaluate intraocular pressure (IOP) changes and investigate the relationship with corneal biomechanics after small-incision lenticule extraction (SMILE) and femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK). METHODS: A total of 193 eyes of 193 patients who underwent SMILE and FS-LASIK procedures were included in this retrospective study. Data were collected preoperatively and postoperatively, including Goldmann-correlated IOP (IOPg), corneal-compensated IOP (IOPcc), corneal hysteresis (CH), and corneal resistance factor (CRF) by ocular response analyzer, noncontact intraocular pressure (IOPNCT) by noncontact tonometer, and Ehlers, Shah, Dresden, Kohlhaas, Orssengo/Pye by the Pentacam corrected system...
August 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27543291/comparison-of-corneal-biomechanics-after-microincision-lenticule-extraction-and-small-incision-lenticule-extraction
#18
Zhiqing Wu, Yan Wang, Jiamei Zhang, Tommy C Y Chan, Alex L K Ng, George P M Cheng, Vishal Jhanji
OBJECTIVES: To evaluate and compare the change in corneal biomechanical properties after microincision lenticule extraction (MILE) and small incision lenticule extraction (SMILE). METHODS: In this prospective study, 60 eyes received MILE surgery with 2 mm opening incision, while 64 eyes received SMILE procedure with 5 mm opening incision. Corneal hysteresis (CH), corneal resistance factor (CRF) and 37 other biomechanical waveform parameters were quantitatively assessed using ocular response analyser (ORA) preoperatively and up to 6 months postoperatively...
August 19, 2016: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/27531114/-clinical-results-of-transepithelial-corneal-collagen-cross-linking-in-the-treatment-of-keratoconus
#19
S H Chen, J Zhang, Y N Li, P Ding, Q M Wang
OBJECTIVE: To evaluate the effect of transepithelial corneal collagen cross-linking (CXL) in the treatment of keratoconus. METHODS: Prospective study. Sixteen eyes of 16 patients with keratoconus underwent transepithelial CXL, and the fellow eyes were considered as the controls. The mean age was (22.4±6.5) years old. In the CXL group, topical anesthesia (0.1% tetracaine) was given for 15 minutes, and 0.5% riboflavin was applied until saturated in the anterior chamber...
July 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/27531109/-an-analysis-of-changes-in-posterior-corneal-elevation-and-relevant-factors-after-small-incision-lenticule-extraction
#20
C J Yu, Y Wang, X L Su, W J Wu, Z Q Wu, Y N Wu
OBJECTIVE: To investigate changes in posterior corneal elevation after small incision lenticule extraction (SMILE) and related factors. METHODS: Retrospective case series study. Eighty-three eyes of 44 myopic patients undergoing SMILE were examined with the Pentacam preoperatively, and at 1 day, 1 month, 3 months, and 6 months postoperatively. Posterior corneal elevation at the corneal apex and 0°, 45°, 90°, 135°, 180°, 225°, 270° and 325° points of the 2 mm and 6 mm diameter (total, 17 points) was analyzed...
July 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
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