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https://www.readbyqxmd.com/read/29340891/mitomycin-c-0-02-and-0-002-efficacy-in-preventing-haze-after-photorefractive-keratectomy
#1
L M Coelho, R O Sieiro
PURPOSE: To compare MMC 0.002% efficacy in preventing haze after PRK in relation to MMC 0.02%. PATIENTS AND METHODS: We conducted a prospective study with patients with myopia or myopic astigmatism undergoing PRK in the same conditions. After PRK, MMC was applied for 30 s in a concentration of 0.02% on the right eye (group 1) and 0.002% on the left eye (group 2). Age, gender, spherical equivalent and haze intensity (1, 3, 6 and 12 months postoperatively) were assessed...
January 16, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29339918/comparability-and-repeatability-of-different-methods-of-corneal-astigmatism-assessment
#2
Tiago B Ferreira, Filomena J Ribeiro
Purpose: To assess the comparability and repeatability of keratometric and astigmatism values measured by four techniques: Orbscan IIz® (Bausch and Lomb), Lenstar LS 900® (Haag-Streit), Cassini® (i-Optics), and Total Cassini (anterior + posterior surface), in healthy volunteers. Patients and methods: Fifteen healthy volunteers (30 eyes) were assessed by the four techniques. In each eye, three consecutive measures were performed by the same operator. Keratometric and astigmatism values were recorded...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29339065/accommodative-esotropia-treatment-plan-utilizing-simultaneous-strabismus-surgery-and-photorefractive-keratectomy
#3
H Sprague Eustis, Pulin Shah
PURPOSE: Accommodative esotropia is a common cause of acquired esotropia. Pathogenesis varies among patients but usually includes excessive hyperopia and a high accommodative convergence/accommodation ratio or tight medial recti. The present study reviews an individualized treatment plan combining photorefractive keratectomy (PRK) and strabismus surgery to correct these problems. DESIGN: This study is a retrospective, interventional case series. METHODS: Records for 15 patients who were treated for accommodative esotropia were reviewed...
January 12, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29335097/aspheric-versus-wavefront-guided-aspheric-photorefractive-keratectomy-in-eyes-with-significant-astigmatism
#4
Amir Faramarzi, Majid Moshirfar, Farid Karimian, Siamak Delfazayebaher, Bahareh Kheiri
PURPOSE: To compare the refractive and higher-order aberrations (HOAs) outcomes after photorefractive keratectomy (PRK) in patients with significant astigmatism using aspheric versus wavefront-guided aspheric profiles. SETTING: Ophthalmic Research Center and Department of Ophthalmology, Shahid Beheshti University of Medical Sciences, Negah Eye Hospital, Tehran, Iran. DESIGN: Prospective randomized case series. METHODS: One eye of each patient with a refractive astigmatism more than 2...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29335095/vector-analysis-of-astigmatic-changes-and-optical-quality-outcomes-after-wavefront-guided-laser-in%C3%A2-situ-keratomileusis-using-a-high-resolution-aberrometer
#5
Juan A Durán, Elisa Gutiérrez, Rebeca Atienza, David P Piñero
PURPOSE: To assess the ocular optical quality results as well as the astigmatic changes after wavefront-guided laser in situ keratomileusis (LASIK) in eyes with myopic astigmatism. SETTING: Instituto Clínico-Quirúrgico Oftalmológico, Bilbao, Vizcaya, Spain. DESIGN: Prospective case series. METHODS: Thirty-three eyes having wavefront-guided LASIK with the Star S4IR excimer laser combined with the iDesign system were enrolled in the study...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29335094/clinical-outcomes-of-laser-in%C3%A2-situ-keratomileusis-with-an-aberration-neutral-profile-centered-on-the-corneal-vertex-comparing-vector-planning-with-manifest-refraction-planning-for-the-treatment-of-myopic-astigmatism
#6
Maria Clara Arbelaez, Noel Alpins, Shwetabh Verma, George Stamatelatos, Juan Guillermo Arbelaez, Samuel Arba-Mosquera
PURPOSE: To evaluate clinical outcomes of laser in situ keratomileusis (LASIK) with an aberration-neutral profile centered on the estimated visual axis (considering 70% of the pupil offset toward the corneal vertex) comparing vector planning with manifest refraction planning for the treatment of myopic astigmatism. SETTING: Muscat Eye Laser Center, Muscat, Sultanate of Oman, Muscat, Oman. DESIGN: Retrospective case series. METHODS: The outcomes were evaluated at a 6-month follow-up in eyes showing ocular residual astigmatism (ORA) over 0...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29331294/-study-of-the-results-scleral-fixated-intraocular-lenses-in-the-absence-of-capsular-support
#7
A Benarous, A Drimbea, S Milazzo
INTRODUCTION: In the absence of sufficient capsular support, scleral fixation of the intraocular lens is an interesting alternative. The goal is to evaluate this implantation technique when traditional implantation is impossible. PATIENTS AND METHODS: This is an observational, retrospective, monocentric study at the Amiens university medical center between August 2013 and March 2016. Patients all underwent scleral fixation of a three-piece implant without suturing of the haptics, after posterior vitrectomy...
January 10, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29331293/toric-lens-implantation-in-cataract-surgery-automated-versus-manual-horizontal-axis-marking-analysis-of-50%C3%A2-cases
#8
M Raucau, H El Chehab, E Agard, C Lagenaite, C Dot
SUBJECT: The main objective of our study was to evaluate the contribution of automated conjunctival registration in the alignment of toric intraocular lenses by comparing automated registration optimized with Callisto® to manual marking of the horizontal axis. MATERIALS AND METHODS: We performed a prospective, descriptive, monocentric study on patients undergoing cataract surgery with a toric intraocular lens (Asphina 709 Zeiss), performed by a surgeon with good experience in toric implants, between September 2016 and March 2017...
January 10, 2018: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29328285/astigmatic-laser-beams-with-a-large-orbital-angular-momentum
#9
Victor V Kotlyar, Alexey A Kovalev, Alexey P Porfirev
We show that an elliptic Gaussian beam, focused by a cylindrical lens, can be represented as a linear combination of a countable number of only even angular harmonics with both positive and negative topological charge. For the orbital angular momentum (OAM) of the astigmatic Gaussian beam, an exact expression is obtained in a form of a converging series of the Legendre functions of the second kind. It is shown that at some conditions only the terms with the positive or negative topological charge are remained in this series...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328231/aberration-accounting-calibration-for-3d-single-molecule-localization-microscopy
#10
Clément Cabriel, Nicolas Bourg, Guillaume Dupuis, Sandrine Lévêque-Fort
We propose a straightforward sample-based technique to calibrate the axial detection in 3D single-molecule localization microscopy. Using microspheres coated with fluorescent molecules, the calibration curves of point spread function-shaping or intensity-based measurements can be obtained over the imaging depth range. This experimental method takes into account the effect of the spherical aberration without requiring computational correction. We demonstrate its efficiency for astigmatic imaging in a 1.2 μm range above the coverslip...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328088/determination-of-the-optimum-double-pass-image-through-focus-operators
#11
Anibal G de Paul, Roberto F Sanchez, Luis A Issolio
A set of autofocus operators (AFO) are assessed for their ability to determine the optimal double-pass image as well as their potential to detect the focus lines and the disc of least confusion in astigmatic eyes. Eight AFO and three optical quality parameters (OQP) often used to analyze double-pass aerial images were considered. To quantify the discriminative power of each AFO and OQP, a maximum discrimination (MD) parameter was proposed. Double-pass images were obtained from an artificial eye with an induced astigmatism (Cylinder: -1  D, -0...
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29327252/compared-vulnerabilities-to-small-cardiac-motions-between-different-cameras-used-for-myocardial-perfusion-imaging
#12
Julien Salvadori, Yolande Petegnief, Remi Sabbah, Olivier Morel, Hatem Boulahdour, Gilles Karcher, Pierre-Yves Marie, Laetitia Imbert
This phantom-based study was aimed to determine whether cardiac CZT-cameras, which provide an enhanced spatial resolution and image contrast compared to Anger cameras, are similarly affected by small cardiac motions. Translations of a left ventricular (LV) insert at half-SPECT acquisitions through six possible orthogonal directions and with 5- or 10-mm amplitude were simulated on the Discovery NM-530c and DSPECT CZT-cameras and on an Anger Symbia T2 camera equipped with an astigmatic (IQ.SPECT) or conventional parallel-hole collimator (Conv...
January 11, 2018: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29323426/vision-in-children-with-autism-spectrum-disorder-a-critical-review
#13
REVIEW
Julie-Anne Little
Autism spectrum disorder (ASD) is a common neurodevelopmental condition with approximately 1-2 per cent prevalence in the population. The condition has lifelong effects for the individual and family, and early intervention and management helps maximise quality of life and outcomes. Many studies of vision in ASD have attempted to link the behavioural and sensory deficits in ASD with underlying visual processing. From this work, it is clear that individuals with ASD 'see' and process the world differently, but there remain gaps in our understanding...
January 11, 2018: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/29321616/defocus-and-magnification-dependent-variation-of-tem-image-astigmatism
#14
Rui Yan, Kunpeng Li, Wen Jiang
Daily alignment of the microscope is a prerequisite to reaching optimal lens conditions for high resolution imaging in cryo-EM. In this study, we have investigated how image astigmatism varies with the imaging conditions (e.g. defocus, magnification). We have found that the large change of defocus/magnification between visual correction of astigmatism and subsequent data collection tasks, or during data collection, will inevitably result in undesirable astigmatism in the final images. The dependence of astigmatism on the imaging conditions varies significantly from time to time, so that it cannot be reliably compensated by pre-calibration of the microscope...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29319597/repeated-same-day-versus-single-tomography-measurements-of-keratoconic-eyes-for-analysis-of-disease-progression
#15
Wolf Wonneberger, Bertil Sterner, Ulrika MacLean, Margareta Claesson, Madeleine Zetterberg
PURPOSE: Corneal tomography is used to assess progression of keratoconus and to direct clinical decisions regarding corneal cross-linking. The purpose of this study was to analyze the variability of repeated Scheimpflug-tomography (Pentacam Classic; Oculus, Wetzlar, Germany) measurements of keratoconic eyes in a clinical setting and to assess the validity of such measurements as a clinical decision-making tool. METHODS: Eighty keratoconic eyes of 45 patients (age range 16-32 years) were examined at baseline and after follow-up periods of 3 to 6 months using 3 consecutive tomography measurements at each visit...
January 9, 2018: Cornea
https://www.readbyqxmd.com/read/29315444/unusual-internal-astigmatism-due-to-severe-capsule-contraction-syndrome
#16
Pierre Zéboulon, Damien Gatinel
PURPOSE: To describe a case of severe capsule contraction syndrome causing significant astigmatism due to intraocular lens (IOL) folding. METHODS: Case report. RESULTS: Capsule fibrosis and contraction resulted in bending of the hydrophilic IOL along its long axis. Anterior Nd:YAG capsulotomy resolved the situation and restored the patient's visual acuity. CONCLUSIONS: Hydrophilic IOLs are more susceptible to capsule contraction due to the increased flexibility of highly hydrated materials...
January 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29315436/energy-setting-and-visual-outcomes-in-smile-a-retrospective-cohort-study
#17
Liuyang Li, Julie M Schallhorn, Jiaonan Ma, Tong Cui, Yan Wang
PURPOSE: To assess the independent effect of energy setting on postoperative uncorrected distance visual acuity (UDVA) in small incision lenticule extraction (SMILE) and further investigate an optimal energy setting for the 4.5-μm spot-track-distance, which is in wide clinical use. METHODS: A total of 1,130 eyes were included in a retrospective cohort study from Tianjin Eye Hospital, Tianjin Medical University from April 2015 to July 2016. Energy settings and baseline characteristics were recorded and 3-month UDVA was tested by a nurse blinded to the energy settings used...
January 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29315401/development-of-a-real-time-wave-field-reconstruction-tem-system-ii-correction-of-coma-aberration-and-3-fold-astigmatism-and-real-time-correction-of-2-fold-astigmatism
#18
Takahiro Tamura, Yoshihide Kimura, Yoshizo Takai
In this study, a function for the correction of coma aberration, 3-fold astigmatism and real-time correction of 2-fold astigmatism was newly incorporated into a recently developed real-time wave field reconstruction TEM system. The aberration correction function was developed by modifying the image-processing software previously designed for auto focus tracking, as described in the first article of this series. Using the newly developed system, the coma aberration and 3-fold astigmatism were corrected using the aberration coefficients obtained experimentally before the processing was carried out...
January 5, 2018: Microscopy
https://www.readbyqxmd.com/read/29308773/evaluation-of-visual-outcomes-after-toric-intraocular-lens-implantation
#19
H R Ng, C H Goh, Y S Ngim, J Juliana
PURPOSE: To evaluate postoperative visual acuity, refractive status and rotational stability of toric intraocular lens (IOL) in correcting pre-existing corneal astigmatism. METHODS: A total of 69 patients with topographic corneal astigmatism of 1.0 Diopter (D) and above who underwent cataract surgery between June 2015 and December 2016 were included in this retrospective observational study. All preoperative toric IOL calculations were performed using immersion biometry...
December 2017: Medical Journal of Malaysia
https://www.readbyqxmd.com/read/29296551/surgical-outcome-of-deep-anterior-lamellar-keratoplasty-with-air-assisted-manual-dissection-for-corneas-with-previous-inflammation-or-fibrosis
#20
Yi-Ju Ho, Cheng-Hsiu Wu, Hung-Chi Chen, Chin-Shi Hsiao, Yi-Jen Hsueh, David Hui-Kang Ma
PURPOSE: To report our experience in air-assisted manual dissection deep anterior lamellar keratoplasty (DALK) for the treatment of corneal scar with previous inflammation and fibrosis. MATERIALS AND METHODS: We retrospectively reviewed the medical history of 21 patients (male:female = 13:8 mean age 41.9 years old) with corneal pathology from previous infection and inflammation. Trephination diameter ranged from 7.0 to 8.0 mm, and the graft was oversized by 0.25-0...
October 2017: Taiwan Journal of Ophthalmology
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