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Farhad Hafezi, Bijan Naghibzadeh, Abbas Kazemi Ashtiani
BACKGROUND: Lower lateral cartilage malposition is represented by anterior convexity of the lower lateral cartilage (LLC) dome with posterior pinch, as defined by Sheen and Constantian. This anatomic variation consists of cephalic, or upward and inward, rotation of lateral crura, particularly in bulbous tip patients. In most cases, "bulbous pinch" LLC is positioned toward the medial canthus, not laterally, so it is referred to as cephalic displacement. Accordingly, it is recommended to caudally displace cartilage in the majority of rhinoplasty cases in which variation is seen...
April 11, 2018: Aesthetic Plastic Surgery
#2
Ilyse D Haberman, Paul Z Lang, Alvaro Fidalgo Broncano, Sang Woo Kim, Farhad Hafezi, J Bradley Randleman
PURPOSE: To evaluate changes in regional corneal epithelial thickness after corneal crosslinking (CXL) using higher fluence (7.2 J/cm2 ) and accelerated treatment time (4 minutes) in eyes with progressive keratoconus using spectral-domain optical coherence tomography (SD-OCT) and to correlate focal epithelial and focal anterior curvature changes. SETTING: Academic medical center in the United States. DESIGN: Prospective case series. METHODS: Patients had anterior segment SD-OCT (RTVue-100) with focal stromal and epithelial measurements and Scheimpflug imaging before and 1, 3, 6, and 12 months after accelerated CXL...
March 30, 2018: Journal of Cataract and Refractive Surgery
#3
Boris Knyazer, Yonit Krakauer, Yael Baumfeld, Tova Lifshitz, Sabine Kling, Farhad Hafezi
PURPOSE: To evaluate the effect of accelerated corneal cross-linking with photoactivated chromophore (PACK-CXL) as additional treatment for therapy-resistant infectious keratitis. METHODS: In this interventional cohort study, 20 patients (11 men and 9 women), aged 65.5 (interquartile range = 21.5-78.5) years, who were hospitalized for moderate-sized therapy-resistant bacterial corneal ulcers (11/20 microbiologically confirmed) were treated with hypoosmolar 0.1% riboflavin solution and Ultraviolet A (UVA) irradiation for 3 minutes at 30 mW/cm (5...
April 2018: Cornea
#4
Emilio Almeida Torres Netto, Wafa Majed Al-Otaibi, Nikki L Hafezi, Sabine Kling, Haya M Al-Farhan, J Bradley Randleman, Farhad Hafezi
BACKGROUND/AIM: Keratoconus (KC) is a ectatic corneal disorder with marked progression during childhood and puberty that may lead to severe visual loss. In addition to KC prevalence, estimate shows major geographical variations; recent studies using Scheimpflug technology are in contrast to the 1980s and 1990s literature. The present study aims to determine the prevalence of KC in paediatric patients in Riyadh, Saudi Arabia (KSA). METHODS: This prospective, cross-sectional, observational, multicentre study collected data from paediatric patients from 6 years and 21 years of age who were seen at multiple non-ophthalmic emergency departments within KSA...
January 3, 2018: British Journal of Ophthalmology
#5
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
#6
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
#7
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
#8
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...
December 2017: American Journal of Ophthalmology
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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)
#17
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/cm2 ) for 2:50 minutes (fluence 1.53 J/cm2 ). CXL was performed as either a single (1×CXL) or a repeated (2×CXL) treatment...
January 1, 2017: Journal of Refractive Surgery
#18
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
#19
MULTICENTER STUDY
Five-Year Safety and Performance Results from the Argus II Retinal Prosthesis System Clinical Trial.
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
#20
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
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