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https://www.readbyqxmd.com/read/28230557/comparison-of-the-conventional-dresden-protocol-and-accelerated-protocol-with-higher-ultraviolet-intensity-in-corneal-collagen-cross-linking-for-keratoconus
#1
Moonjung Choi, Jiwon Kim, Eung Kweon Kim, Kyoung Yul Seo, Tae-Im Kim
PURPOSE: To compare the accelerated corneal cross-linking (CXL) protocol and the conventional Dresden protocol in patients with keratoconus in terms of visual acuity, keratometric values, and topographic parameters. METHODS: Twenty-eight eyes of 25 patients with primary keratoconus were divided into 2 groups; 15 eyes in group 1 received CXL under the standard Dresden protocol (3 mW/cm for 30 min, dose 5.4 J/cm) and 13 eyes in group 2 were treated with the accelerated protocol (30 mW/cm for 3 min 40 s, dose 6...
February 22, 2017: Cornea
https://www.readbyqxmd.com/read/28210179/corneal-biomechanics-in-normal-saudi-individuals
#2
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/28192586/three-year-stability-of-posterior-corneal-elevation-after-small-incision-lenticule-extraction-smile-for-moderate-and-high-myopia
#3
Yu Zhao, Weijun Jian, Yingjun Chen, Michael C Knorz, Xingtao Zhou
PURPOSE: To investigate long-term changes in posterior corneal elevation after small incision lenticule extraction (SMILE). METHODS: Thirty-six eyes of 20 patients (7 male, 13 female) who underwent SMILE were recruited for this prospective consecutive study. The mean preoperative manifest spherical equivalent was -6.24 ± 1.47 diopters (D) (range: -3.88 to -8.75 D). Posterior corneal surfaces were measured by a Scheimpflug camera (Pentacam; Oculus Optikgeräte GmbH, Wetzlar, Germany) preoperatively and at 1 month, 6 months, 12 months, 2 years, and 3 years after surgery...
February 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28192585/correlations-of-objective-metrics-for-quantifying-dysfunctional-lens-syndrome-with-visual-acuity-and-phacodynamics
#4
Fernando Faria-Correia, Isaac Ramos, Bernardo Lopes, Tiago Monteiro, Nuno Franqueira, Renato Ambrósio
PURPOSE: To study the relationship between objective metrics for quantifying crystalline lens dysfunction with visual impairment and phacodynamics parameters in age-related nuclear cataracts. METHODS: A total of 51 eyes (34 patients) with age-related nuclear cataract had phacoemulsification. The Dysfunctional Lens Index (0 to 10 points) was measured by a ray-tracing aberrometry (iTrace Visual Function Analyzer; Tracey Technologies, Houston, TX). The average lens density (0 to 100) was evaluated using a rotating Scheimpflug system (Pentacam HR; Oculus Optikgeräte GmbH, Wetzlar, Germany), and the nuclear opalescence score was subjectively assessed using the Lens Opacities Classification System III (LOCS III)...
February 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28185842/corneal-astigmatism-measurement-by-ray-tracing-versus-anterior-surface-based-keratometry-in-candidates-for-toric-iol-implantation
#5
Ugo de Sanctis, Piero Donna, Rachele R Penna, Maria Isabella Calastri, Chiara M Eandi
PURPOSE: To compare corneal astigmatism derived from total corneal refractive power (CATCRP), a ray-tracing method, with that derived from simulated keratometry (CASimK), an anterior surface-based method, in candidates for toric intraocular lens (IOL) implantation. DESIGN: Reliability analysis. METHODS: In one eye of 200 consecutive patients (mean age 71 ±9 years) with cataract, a Pentacam HR (Oculus, Wetzlar, Germany) was used to measure CATCRP and CASimK...
February 6, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28178925/torsional-and-flattening-effect-on-corneal-astigmatism-after-cataract-surgery-a-retrospective-analysis
#6
Yuli Park, Hyun Seung Kim
BACKGROUND: To evaluate the torsional and flattening effect of steep meridian incisions and influence of posterior corneal astigmatism (PCA) on total corneal astigmatism (TCA) after cataract surgery. METHODS: One hundred thirty-two eyes underwent cataract surgery with steep meridian 2.2 mm microcoaxial and 2.85 mm conventional clear corneal incisions. Eyes were divided into with-the-rule (WTR) astigmatism and against-the-rule (ATR) astigmatism groups depending on the steeper meridian and measured with autokeratorefractor and Pentacam® before surgery, at 1 day, 1 week, 1 and 2 months postoperatively...
February 8, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28163862/comparison-of-central-corneal-thickness-measurements-by-pentacam-and-ultrasound-pachymetry-in-normal-myopic-patients
#7
Sherif Emerah, Ehab ELZakzouk, Mohamed Farag
INTRODUCTION: Precise measurement of corneal thickness is of crucial importance in corneal refractive procedures. The aim of this work is to compare the central corneal thickness measurements using Scheimpflug imaging (Pentacam) and contact US pachymetry in normal myopic patients. METHODS: This retrospective cohort study was conducted on in 144 eyes of 72 normal myopic patients during 6 months. The study location was the Research Institute of Ophthalmology (Giza, Egypt), and Magrabi Eye Hospital (Dubai, United Arab Emirates)...
December 2016: Electronic Physician
https://www.readbyqxmd.com/read/28149779/clinical-evaluation-of-surgery-induced-astigmatism-in-cataract-surgery-using-2-2-mm-or-1-8-mm-clear-corneal-micro-incisions
#8
Jun Yang, Xiu Wang, Hong Zhang, Yi Pang, Rui-Hua Wei
AIM: To evaluate corneal astigmatism after phacoemulsification using 2.2 mm or 1.8 mm clear corneal micro-incisions and its effects on visual function. METHODS: Sixty cases (60 eyes) with cataract were randomly divided into groups A (n=30) and B (n=30) respectively underwent 2.2 mm and 1.8 mm clear corneal tunnel incision phacoemulsification combined with folding intraocular lens implantation from the time direction of 11:00. On day 1 and at 1, 4, and 6wk after operation, patients' vision was measured and both the corneal curvature and corneal thickness (CT) were recorded using Pentacam...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28129300/multimodal-assessment-of-corneal-thinning-using-optical-coherence-tomography-scheimpflug-imaging-pachymetry-and-slit-lamp-examination
#9
Julius T Oatts, Jeremy D Keenan, Tova Mannis, Tom M Lietman, Jennifer Rose-Nussbaumer
PURPOSE: To assess the relationship between corneal thinning measured by clinician-graded slit-lamp examination compared with ultrasound pachymetry (USP), anterior segment optical coherence tomography (AS-OCT), and the Pentacam. METHODS: Patients with corneal thinning underwent USP, AS-OCT, Pentacam measurements and standardized clinical grading by 2 cornea specialists estimating thinning on slit-lamp examination. Reproducibility of each testing modality was assessed using the intraclass correlation coefficient...
January 26, 2017: Cornea
https://www.readbyqxmd.com/read/28129291/characteristics-of-corneal-astigmatism-of-anterior-and-posterior-surface-in-a-normal-control-group-and-patients-with-keratoconus
#10
Mehdi Shajari, Stefan Friderich, Miad Pour Sadeghian, Ingo Schmack, Thomas Kohnen
PURPOSE: To evaluate and compare power and axis orientation of anterior and posterior astigmatism in eyes with keratoconus with healthy eyes. METHODS: In this retrospective cohort study, we examined 861 eyes of 494 patients diagnosed with keratoconus at the Department of Ophthalmology, University Hospital Frankfurt, and 256 eyes of 256 healthy individuals. Using a Scheimpflug device (Pentacam HR), we measured the magnitude and axis orientation of anterior and posterior corneal astigmatism, corneal thickness, and conus location...
January 26, 2017: Cornea
https://www.readbyqxmd.com/read/28108902/comparison-of-anterior-segment-measurements-with-lenstar-and-pentacam-in-patients-with-newly-diagnosed-glaucoma
#11
Emine Sen, Merve Inanc, Ufuk Elgin, Pelin Yilmazbas
PURPOSE: To compare anterior segment measurements obtained using the Pentacam; Oculus, HR and the LenStar LS 900 in patients with newly diagnosed glaucoma. METHODS: Patients with ocular hypertension and primary open-angle glaucoma who had been treated with PGA were included in the study. Anterior segment measurements including central corneal thickness (CCT), keratometry, anterior chamber depth (ACD) and white-to-white (WTW) corneal diameter obtained with the optic low-coherent reflectometer (LenStar LS-900, Haag-Streit AG, Switzerland) and with the Scheimpflug system (Pentacam; Oculus, HR) were compared...
January 21, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28086913/correction-of-irregular-and-induced-regular-corneal-astigmatism-with-toric-iol-after-posterior-segment-surgery-a-case-series
#12
Bence L Kolozsvári, Gergely Losonczy, Dorottya Pásztor, Mariann Fodor
BACKGROUND: Toric intraocular lens (IOL) implantation can be an effective method for correcting corneal astigmatism in patients with vitreoretinal diseases and cataract. Our purpose is to report the outcome of toric IOL implantation in two cases - a patient with scleral-buckle-induced regular corneal astigmatism and a patient with keratoconus following pars plana vitrectomy. As far as we are aware, there are no reported cases of toric IOL implantation in a vitrectomized eye with keratoconus nor of toric IOL implantation in patients with scleral-buckle-induced regular corneal astigmatism...
January 13, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28081172/influence-of-corneal-opacity-on-intraocular-pressure-assessment-in-patients-with-lysosomal-storage-diseases
#13
Joanna Wasielica-Poslednik, Giuseppe Politino, Irene Schmidtmann, Katrin Lorenz, Katharina Bell, Norbert Pfeiffer, Susanne Pitz
AIMS: To investigate an influence of mucopolysaccharidosis (MPS)- and Morbus Fabry-associated corneal opacities on intraocular pressure (IOP) measurements and to evaluate the concordance of the different tonometry methods. METHODS: 25 MPS patients with or without corneal clouding, 25 Fabry patients with cornea verticillata ≥ grade 2 and 25 healthy age matched controls were prospectively included into this study. Outcome measures: Goldmann applanation tonometry (GAT); palpatory assessment of IOP; Goldmann-correlated intraocular pressure (IOPg), corneal-compensated intraocular pressure (IOPcc), corneal resistance factor (CRF) and corneal hysteresis (CH) assessed by Ocular Response Analyzer (ORA); central corneal thickness (CCT) and density assessed with Pentacam...
2017: PloS One
https://www.readbyqxmd.com/read/28079690/noncontact-evaluation-of-corneal-grafts-swept-source-fourier-domain-oct-versus-high-resolution-scheimpflug-imaging
#14
Eszter Szalai, Gábor Németh, Ziad Hassan, László Módis
PURPOSE: To study the reliability and repeatability of anterior segment measurements in patients who underwent penetrating keratoplasty with swept light source Fourier domain anterior segment optical coherence tomography (SS-OCT) in comparison with a high-resolution Scheimpflug camera. METHODS: Keratometry (K) and elevation data of the anterior and posterior corneal surfaces, central corneal thickness, and anterior chamber depth were determined in 56 postkeratoplasty eyes (mean age: 59...
January 11, 2017: Cornea
https://www.readbyqxmd.com/read/28076565/effect-of-corneal-biomechanical-properties-on-surgically-induced-astigmatism-and-higher-order-aberrations-after-cataract-surgery
#15
Mustafa Koç, Çağrı İlhan, Yaran Koban, Kemal Özülken, İrfan Durukan, Pelin Yılmazbaş
Purpose: To investigate the relationship between biomechanical properties of the cornea and postoperative refractive changes in patients with low-level astigmatism after cataract surgery. Methods: This prospective study recruited patients undergoing cataract surgery involving 2.8-mm superior incisions. Biomechanical properties of the cornea were evaluated preoperatively using the Ocular Response Analyzer, and corneal profiles were evaluated using a Scheimpflug system (Pentacam HR)...
November 2016: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/28076560/evaluation-of-anterior-segment-parameters-using-scheimpflug-technology-during-the-valsalva-maneuver-in-patients-with-keratoconus
#16
Yusuf Koçluk, Emine Alyamaç Sukgen, Selim Cevher
Purpose: This study aimed to explore the effects of the Valsalva maneuver (VM) on ectatic corneas during anterior segment tomography scans using a Scheimpflug camera. Methods: This prospective observational study included 100 eyes of 50 patients with bilateral keratoconus (KC). Anterior segment tomography was first performed when the patients were in a resting position and immediately repeated as the participant performed VM. Scheimpflug images were taken using a Pentacam®...
November 2016: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/28069281/-effect-of-donor-graft-characteristics-on-clinical-outcomes-in-descemet-stripping-automated-endothelial-keratoplasty-dsaek
#17
G Ho Wang Yin, M Sampo, S Soare, L Hoffart
INTRODUCTION: The purpose of our study was to evaluate the progression of lamellar corneal grafts after endothelial keratoplasty by Descemet stripping automated endothelial keratoplasty (DSAEK) and the effect of their characteristics on the clinical and functional results. MATERIALS AND METHODS: This was a prospective study in which 74 patients who had undergone endothelial keratoplasty by DSAEK were included. The corneal grafts were obtained from a French tissue bank and were delivered in a preservation medium containing a deturgescent agent (Corneajet(®) or Stemalpha 3(®))...
January 6, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28068441/changes-in-astigmatism-densitometry-and-aberrations-after-smile-for-low-to-high-myopic-astigmatism-a-12-month-prospective-study
#18
Iben Bach Pedersen, Anders Ivarsen, Jesper Hjortdal
PURPOSE: To evaluate 12-month changes in refraction, visual outcome, corneal densitometry, and postoperative aberrations after small incision lenticule extraction (SMILE) for myopic astigmatism. METHODS: This 12-month prospective clinical trial comprised 101 eyes (101 patients) treated with SMILE for myopic astigmatism with cylinder of 0.75 to 4.00 diopters (D). The preoperative, 1-week, and 1-, 3-, 6-, 9-, and 12-month examinations included measurement of manifest refraction, uncorrected distance visual acuity (UDVA), and corrected (CDVA) distance visual acuity...
January 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28068440/a-prospective-study-to-compare-visual-outcomes-between-wavefront-optimized-and-topography-guided-ablation-profiles-in-contralateral-eyes-with-myopia
#19
Rohit Shetty, Rushad Shroff, Kalyani Deshpande, Roshan Gowda, Sumeet Lahane, Chaitra Jayadev
PURPOSE: To analyze refractive outcomes of wavefront-optimized (WFO) ablation and topography-guided custom ablation (TCAT) profiles using the Allegretto Wave excimer laser platform (Alcon Laboratories, Inc., Fort Worth, TX) in the treatment of myopia. METHODS: Sixty eyes of 30 patients who underwent LASIK were included in this prospective interventional study. WFO ablation was performed in one eye (WFO group) and TCAT in the fellow eye (TCAT group). The WaveLight FS200 femtosecond laser (Alcon Laboratories, Inc...
January 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28068365/tonographic-effect-of-ocular-response-analyzer-in-comparison-to-goldmann-applanation-tonometry
#20
Martin Zimmermann, Susanne Pitz, Irene Schmidtmann, Norbert Pfeiffer, Joanna Wasielica-Poslednik
AIMS: The tonographic effect is a phenomenon of intraocular pressure (IOP) reduction following repeated tonometry. This study examines whether the tonographic effect occurs following IOP measurement performed with Ocular Response Analyzer (ORA). METHODS: Both eyes of 31 glaucoma patients and 35 healthy controls underwent nine IOP-measurements performed with GAT and ORA. The number of GAT and ORA measurements performed on each eye differed depending on the randomly allocated investigation scheme...
2017: PloS One
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