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farhad hafezi

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https://www.readbyqxmd.com/read/29242757/differential-gene-transcription-of-extracellular-matrix-components-in-response-to-in-vivo-corneal-crosslinking-cxl-in-rabbit-corneas
#1
Sabine Kling, Arthur Hammer, Emilio A Torres Netto, Farhad Hafezi
Purpose: We studied changes in gene transcription after corneal crosslinking (CXL) in the rabbit cornea in vivo and identified potential molecular signaling pathways. Methods: A total of 15 corneas of eight male New-Zealand-White rabbits were de-epithelialized and equally divided into five groups. Group 1 served as an untreated control. Groups 2 to 5 were soaked with 0.1% riboflavin for 20 minutes, which in Groups 3 to 5 was followed by UV-A irradiation at a fluence of 5...
December 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/29178698/effects-of-riboflavin-calcium-phosphate-layer-and-adhesive-system-on-stress-strain-behavior-of-demineralized-dentin
#2
Tissiana Bortolotto, Anastasia Ryabova, Izabella Nerushay, Sabine Kling, Farhad Hafezi, Franklin Garcia-Godoy, Ivo Krejci
PURPOSE: To evaluate if three dentin treatments improved mechanical properties of demineralized dentin. METHODS: Dentin slices were demineralized and treated with a universal adhesive, Scotchbond Universal (SBU), a cross-linker, Riboflavin (RF), and a calcium phosphate-based product, Teethmate (TM). The groups (n= 8 per group) were: Group 1: SBU, Group 2: RF + SBU, Group 3: RF + TM + SBU. Tensile tests were performed; stress/strain curves and E modulus were calculated...
August 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29117410/corneal-cross-linking-cxl-standardizing-terminology-and-protocol-nomenclature
#3
EDITORIAL
J Bradley Randleman, Marcony R Santhiago, George D Kymionis, Farhad Hafezi
No abstract text is available yet for this article.
November 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29032108/pregnancy-induced-changes-in-corneal-biomechanics-and-topography-are-thyroid-hormone-related
#4
David Tabibian, Begoña M de Tejada, Zisis Gatzioufas, Sabine Kling, Vanessa S Meiss, Marc-Olivier Boldi, Véronique Othenin-Girard, Antonina Chilin, Julien Lambiel, Florence Hoogewoud, Farhad Hafezi
PURPOSE: To identify biomechanical and topographic changes of the cornea during pregnancy and the postpartum period and its association to hormonal changes. DESIGN: Prospective single-center observational cohort study. METHODS: Participants were 24 pregnant women (48 eyes), monitored throughout pregnancy and after delivery. Biomechanical and topographic corneal properties were measured using the Ocular Response Analyzer (ORA) and a Scheimpflug imaging system (Pentacam HR) each trimester and 1 month after delivery...
October 13, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28932337/collagen-cross-linking-for-paediatric-keratoconus
#5
Georgios D Panos, Nikolaos Kozeis, Miltiadis Balidis, Marilita M Moschos, Farhad Hafezi
BACKGROUND: Since the late 1990s corneal crosslinking (CXL) has been proposed as a new treatment option which can stop progression of keratoconus with promising results in adults. OBJECTIVE: Keratoconus presents a higher rate and faster progression in paediatric patients and for this reason prompt and effective treatment is essential. Due to its success in adult keratoconus patients, CXL has been recently applied to children in order to stop or slow progression of keratoconus in paediatric patients...
2017: Open Ophthalmology Journal
https://www.readbyqxmd.com/read/28745902/disability-adjusted-life-years-dalys-for-315-diseases-and-injuries-and-healthy-life-expectancy-hale-in-iran-and-its-neighboring-countries-1990-2015-findings-from-global-burden-of-disease-study-2015
#6
Sadaf G Sepanlou, Mahboubeh Parsaeian, Kristopher J Krohn, Ashkan Afshin, Farshad Farzadfar, Gholamreza Roshandel, Chante Karimkhani, Sharzad Bazargan-Hejazi, Aliasghar Ahmad Kiadaliri, Hamid Ahmadieh, Shirin Djalalinia, Hedyeh Ebrahimi, Babak Eshrati, Ali Reza Esteghamati, Maryam S Farvid, Seyed-Mohammad Fereshtehnejad, Nima Hafezi-Nejad, Mohammad Sadegh Hassanvand, Pouria Heydarpour, Farhad Islami, Seyed M Karimi, Marzieh Katibeh, Ardeshir Khosravi, Jagdish Khubchandani, Mahdi Mahdavi, Farhad Pishgar, Mostafa Qorbani, Vafa Rahimi-Movaghar, Sare Safi, Mohammad Ali Sahraian, Saeid Shahraz, Sara Sheikhbahaei, Alireza Mohammadi, Ali H Mokdad, Theo Vos, Christopher J L Murray, Maziar Moradi-Lakeh, Mohsen Naghavi, Reza Malekzadeh
BACKGROUND: Summary measures of health are essential in making estimates of health status that are comparable across time and place. They can be used for assessing the performance of health systems, informing effective policy making, and monitoring the progress of nations toward achievement of sustainable development goals. The Global Burden of Diseases, Injuries, and Risk Factors Study 2015 (GBD 2015) provides disability-adjusted life-years (DALYs) and healthy life expectancy (HALE) as main summary measures of health...
July 2017: Archives of Iranian Medicine
https://www.readbyqxmd.com/read/28745901/prevalence-and-years-lived-with-disability-of-310-diseases-and-injuries-in-iran-and-its-neighboring-countries-1990-2015-findings-from-global-burden-of-disease-study-2015
#7
Shirin Djalalinia, Sahar Saeedi Moghaddam, Maziar Moradi-Lakeh, Saeid Shahraz, Mohsen Naghavi, Christopher J L Murray, Theo Vos, Ali H Mokhdad, Kris Krohn, Goodarz Danaei, Ashkan Afshin, Sadaf G Sepanlou, Shahrzad Bazargan-Hejazi, Niloofar Peykari, Nazila Rezaei, Gholamreza Roshandel, Chante Karimkhani, Babak Moazen, Farshad Pourmalek, Ali Reza Esteghamati, Nima Hafezi-Nejad, Sara Sheikhbahaei, Marzieh Katibeh, Hamid Ahmadieh, Sare Safi, Mostafa Qorbani, Farhad Islami, Ardeshir Khosravi, Mohammad Sadegh Hasanvand, Mahdi Mahdavi, Aliasghar A Kiadaliri, Maryam S Farvid, Seyed M Karimi, Alireza Mohammadi, Hamid Asayesh, Reza Assadi, Jagdish Khubchandani, Pouria Heydarpour, Seyed Mohammad Fereshtehnejad, Saeid Safiri, Amir Kasaeian, Bagher Larijani, Reza Malekzadeh, Farshad Farzadfar
BACKGROUND: Due to significant achievements in reducing mortality and increasing life expectancy, the issue of disability from diseases and injuries, and their related interventions, has become one of the most important concerns of health-related research. METHODS: Using data obtained from the GBD 2015 study, the present report provides prevalence and years lived with disability (YLDs) of 310 diseases and injuries by sex and age in Iran and neighboring countries over the period 1990-2015...
July 2017: Archives of Iranian Medicine
https://www.readbyqxmd.com/read/28494492/biomechanical-differences-between-femtosecond-lenticule-extraction-flex-and-small-incision-lenticule-extraction-smile-tested-by-2d-extensometry-in-ex-vivo-porcine-eyes
#8
Bogdan Spiru, Sabine Kling, Farhad Hafezi, Walter Sekundo
Purpose: To evaluate the biomechanical stability of ex vivo porcine corneas after femtosecond lenticule extraction (FLEx) and small incision lenticule extraction (SmILE) refractive surgeries. Methods: Forty-five porcine eyes were equally divided into three groups: Groups 1 and 2 were treated with FLEx and SmILE procedure, respectively. Group 3 served as control. A refractive correction of -14 diopters (D) with a 7-mm zone using either a 160-μm flap (FLEx) or a 160-μm cap (SmILE) was performed...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28264134/biomechanical-weakening-of-different-re-treatment-options-after-small-incision-lenticule-extraction-smile
#9
Sabine Kling, Bogdan Spiru, Farhad Hafezi, Walter Sekundo
PURPOSE: To determine the corneal weakening induced by different re-treatment options after small incision lenticule extraction (SMILE) and investigate the potential of corneal cross-linking (CXL) to reestablish the original corneal stress resistance. METHODS: A total of 96 freshly enucleated porcine corneas were used. The initial refractive correction was defined to be -11.00 diopters (D) and the required enhancement to be -3.00 D. Three different re-treatment options were analyzed: -3D Re-SMILE, -3D photorefractive keratectomy (PRK) on top of the SMILE cap, and cap-to-flap conversion and -3D excimer ablation on the stromal bed (LASIK)...
March 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28192592/an-algorithm-to-predict-the-biomechanical-stiffening-effect-in-corneal-cross-linking
#10
Sabine Kling, Farhad Hafezi
PURPOSE: To develop an algorithm to predict the stiffening effect of CXL and to verify the accuracy with results obtained from experimental measurements. METHODS: The algorithm considers different variables: the reaction kinetics of riboflavin diffusion and riboflavin photodegradation to determine the effective riboflavin concentration in different stromal layers; the oxygen diffusion and ultraviolet (UV) absorption to determine the amount of reactive oxygen species as a function of time and stromal depth...
February 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28149672/corneal-cross-linking-with-riboflavin-and-uv-a-in-the-mouse-cornea-in-vivo-morphological-biochemical-and-physiological-analysis
#11
Sabine Kling, Arthur Hammer, Alain Conti, Farhad Hafezi
PURPOSE: To morphologically, biochemically, and physiologically characterize corneal cross-linking with riboflavin and UV-A light (CXL) in a newly established in vivo murine model. METHODS: C57BL/6 wild-type mice (N = 67) were treated with various CXL protocols, with modification of the following parameters: total energy (fluence) used, duration of UV-A irradiation, continuous versus pulsed irradiation, and CXL under hypoxic conditions (contact lens). Corneas were evaluated biomicroscopically, histologically, and using optical coherence tomography...
January 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28125860/corneal-biomechanics-a-review
#12
REVIEW
Sabine Kling, Farhad Hafezi
PURPOSE: In recent years, the interest in corneal biomechanics has strongly increased. The material properties of the cornea determine its shape and therefore play an important role in corneal ectasia and related pathologies. This review addresses the molecular origin of biomechanical properties, models for their description, methods for their characterisation, techniques for their modification, and computational simulation approaches. RECENT FINDINGS: Recent research has focused on developing non-contact techniques to measure the biomechanical properties in vivo, on determining structural and molecular abnormalities in pathological corneas, on developing and optimising techniques to reinforce the corneal tissue and on the computational simulation of surgical interventions...
May 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28068449/repeated-cross-linking-after-a-short-time-does-not-provide-any-additional-biomechanical-stiffness-in-the-mouse-cornea-in-vivo
#13
David Tabibian, Sabine Kling, Arthur Hammer, Olivier Richoz, Farhad Hafezi
PURPOSE: To study whether repeated collagen cross-linking (CXL) performed in vivo in mice shows an additive effect on mechanical corneal stiffness. METHODS: In this experimental study, epithelium-off CXL was performed in a total of 18 eyes from male C57BL/6 mice, with 0.27%-riboflavin solution applied for 20 minutes, followed by ultraviolet-A (UVA) irradiation (365 nm, 9mW/cm(2)) for 2:50 minutes (fluence 1.53 J/cm(2)). CXL was performed as either a single (1×CXL) or a repeated (2×CXL) treatment...
January 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27984365/mid-term-results-of-a-single-intrastromal-corneal-ring-segment-for-mild-to-moderate-progressive-keratoconus
#14
Mohammad Miraftab, Hassan Hashemi, Farhad Hafezi, Soheila Asgari
PURPOSE: To study the mid-term effects of implanting a single intracorneal ring segment (ICRS) for treatment of mild to moderate progressive keratoconus. METHODS: This retrospective study was conducted on patients with progressive keratoconus treated with ICRS. The mean follow-up time was 15.2 ± 8.8 (range, 7-26) months before and 27.8 ± 7.5 (range, 18-35) months after surgery. Patients received no other treatment during this time. Of the cases studied, 59.1% had inferior keratoconus...
May 2017: Cornea
https://www.readbyqxmd.com/read/27453256/five-year-safety-and-performance-results-from-the-argus-ii-retinal-prosthesis-system-clinical-trial
#15
MULTICENTER STUDY
Lyndon da Cruz, Jessy D Dorn, Mark S Humayun, Gislin Dagnelie, James Handa, Pierre-Olivier Barale, José-Alain Sahel, Paulo E Stanga, Farhad Hafezi, Avinoam B Safran, Joel Salzmann, Arturo Santos, David Birch, Rand Spencer, Artur V Cideciyan, Eugene de Juan, Jacque L Duncan, Dean Eliott, Amani Fawzi, Lisa C Olmos de Koo, Allen C Ho, Gary Brown, Julia Haller, Carl Regillo, Lucian V Del Priore, Aries Arditi, Robert J Greenberg
PURPOSE: The Argus II Retinal Prosthesis System (Second Sight Medical Products, Inc, Sylmar, CA) was developed to restore some vision to patients blind as a result of retinitis pigmentosa (RP) or outer retinal degeneration. A clinical trial was initiated in 2006 to study the long-term safety and efficacy of the Argus II System in patients with bare or no light perception resulting from end-stage RP. DESIGN: Prospective, multicenter, single-arm clinical trial. Within-patient controls included the nonimplanted fellow eye and patients' native residual vision compared with their vision with the Argus II...
October 2016: Ophthalmology
https://www.readbyqxmd.com/read/27304600/transepithelial-corneal-cross-linking-using-an-enhanced-riboflavin-solution
#16
MULTICENTER STUDY
Zisis Gatzioufas, Frederik Raiskup, David O'Brart, Eberhard Spoerl, Georgios D Panos, Farhad Hafezi
PURPOSE: To assess the efficacy of a modified high concentration riboflavin solution containing benzalkonium chloride 0.01% for transepithelial corneal cross-linking (CXL). METHODS: In this prospective, interventional multicenter cohort study, 26 eyes of 26 patients with documented progressive keratoconus who underwent transepithelial CXL were included. Follow-up at 6 and 12 months postoperatively included slit-lamp examination, uncorrected and corrected distance visual acuity (logMAR), maximum keratometry (Kmax), and corneal pachymetry (corneal thinnest point) as determined by Scheimpflug imaging...
June 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27096139/pack-cxl-corneal-cross-linking-in-infectious-keratitis
#17
REVIEW
David Tabibian, Cosimo Mazzotta, Farhad Hafezi
BACKGROUND: Corneal cross-linking (CXL) using ultraviolet light-A (UV-A) and riboflavin is a technique developed in the 1990's to treat corneal ectatic disorders such as keratoconus. It soon became the new gold standard in multiple countries around the world to halt the progression of this disorder, with good long-term outcomes in keratometry reading and visual acuity. The original Dresden treatment protocol was also later on used to stabilize iatrogenic corneal ectasia appearing after laser-assisted in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK)...
2016: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/27027629/stromal-demarcation-line-in-pulsed-versus-continuous-light-accelerated-corneal-cross-linking-for-keratoconus
#18
RANDOMIZED CONTROLLED TRIAL
Alireza Peyman, Alireza Nouralishahi, Farhad Hafezi, Sabine Kling, Mohamadreza Peyman
PURPOSE: To compare the stromal demarcation line depth in pulsed versus continuous corneal cross-linking (CXL) for keratoconus. METHODS: Seventy eyes underwent epithelium-off cross-linking, with 0.1% riboflavin applied during 10 minutes prior to ultraviolet irradiation at 30 mW/cm2. Thirty-six eyes received pulsed irradiation (1 second on, 1 second off) for 8 minutes and 34 eyes underwent continuous irradiation for 4 minutes. Total fluence was 7.2 J/cm2 for both groups...
March 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/26766395/analysis-of-riboflavin-compounds-in-the-rabbit-cornea-in-vivo
#19
Arthur Hammer, Serge Rudaz, Sylvie Guinchard, Sabine Kling, Olivier Richoz, Farhad Hafezi
PURPOSE: To investigate the composition and concentration of individual riboflavin compounds in the corneal stroma in vivo after soaking with various commercially available riboflavin formulations. METHODS: Experiments were performed in 26 rabbit corneas in vivo: 24 corneas were soaked with riboflavin formulations for 30 minutes or with 0.9% NaCl for control (n = 2). After treatment, corneas were excised and prepared for ultra-high-pressure liquid chromatography (UHPLC) analysis...
September 2016: Current Eye Research
https://www.readbyqxmd.com/read/26653730/increased-biomechanical-efficacy-of-corneal-cross-linking-in-thin-corneas-due-to-higher-oxygen-availability
#20
COMPARATIVE STUDY
Sabine Kling, Olivier Richoz, Arthur Hammer, David Tabibian, Soosan Jacob, Amar Agarwal, Farhad Hafezi
PURPOSE: To compare the currently available ultraviolet-A (UV-A) corneal cross-linking (CXL) treatment protocols for thin corneas with respect to oxygen, UV fluence, and osmotic pressure. METHODS: Freshly enucleated murine (n = 16) and porcine (n = 16) eyes were used. The dependency on oxygen and the amount of UV absorption were evaluated using different CXL protocols, including standard CXL, contact lens-assisted CXL (caCXL), and CXL after corneal swelling. The CXL protocol was adapted from the treatment parameters of the human cornea to fit the thickness of murine and porcine corneas...
December 2015: Journal of Refractive Surgery
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