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https://www.readbyqxmd.com/read/29667435/clinical-and-surgical-risk-factors-for-consecutive-exotropia
#1
Sophie Bryselbout, Veronique Promelle, Florent Pracca, Solange Milazzo
INTRODUCTION: Consecutive exotropia is one of the complications of esotropia surgery. Its prevalence is estimated at 4%-27%. The aim of this study was to identify the risk factors for consecutive exotropia in the aftermath of surgical treatment of esotropia. METHODS: Seventy-four patients examined in our strabismus consultation for a consecutive exotropia from January 2010 to June 2016 were retrospectively included. The age of onset of esotropia, the presence of amblyopia, the age of esotropia surgery and chosen procedure, the refractive errors, the anomalies of ocular motility, the age of onset of the consecutive exotropia and its angle of deviation were reported...
April 1, 2018: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/29657982/epithelial-ingrowth-following-laser-in-situ-keratomileusis-lasik-prevalence-risk-factors-management-and-visual-outcomes
#2
REVIEW
Darren Shu Jeng Ting, Sathish Srinivasan, Jean-Pierre Danjoux
The number of laser in situ keratomileusis (LASIK) procedures is continuing to rise. Since its first application for correcting simple refractive errors over 25 years ago, the role of LASIK has extended to treat other conditions, including postkeratoplasty astigmatism/ametropia, postcataract surgery refractive error and presbyopia, among others. The long-term effectiveness, predictability and safety have been well established by many large studies. However, due to the creation of a potential interface between the flap and the underlying stroma, interface complications such as infectious keratitis, diffuse lamellar keratitis and epithelial ingrowth may occur...
2018: BMJ Open Ophthalmology
https://www.readbyqxmd.com/read/29644238/mechanisms-of-optical-regression-following-corneal-laser-refractive-surgery-epithelial-and-stromal-responses
#3
REVIEW
Majid Moshirfar, Jordan D Desautels, Brian D Walker, Michael S Murri, Orry C Birdsong, Phillip C Hoopes
Laser vision correction is a safe and effective method of reducing spectacle dependence. Photorefractive Keratectomy (PRK), Laser In Situ Keratomileusis (LASIK), and Small-Incision Lenticule Extraction (SMILE) can accurately correct myopia, hyperopia, and astigmatism. Although these procedures are nearing optimization in terms of their ability to produce a desired refractive target, the long term cellular responses of the cornea to these procedures can cause patients to regress from the their ideal postoperative refraction...
2018: Medical Hypothesis, Discovery and Innovation in Ophthalmology
https://www.readbyqxmd.com/read/29623463/current-perspectives-on-corneal-collagen-crosslinking-cxl
#4
Sandeepani K Subasinghe, Kelechi C Ogbuehi, George J Dias
Corneal collagen crosslinking has revolutionized the treatment of keratoconus and post-refractive corneal ectasia in the past decade. Corneal crosslinking with riboflavin and ultraviolet A is proposed to halt the progression of keratectasia. In the original "Conventional Dresden Protocol" (C-CXL), the epithelium is removed prior to the crosslinking process to facilitate better absorption of riboflavin into the corneal stroma. Studies analyzing its short- and long-term outcomes revealed that although there are inconsistencies as to the effectiveness of this technique, the advantages prevail over the disadvantages...
April 6, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29615281/corneal-biomechanics-after-laser-refractive-surgery-unmasking-differences-between-techniques
#5
REVIEW
Joaquín Fernández, Manuel Rodríguez-Vallejo, Javier Martínez, Ana Tauste, David P Piñero
The hypothesis that small-incision lenticule extraction provides better preservation of corneal biomechanics than previous laser refractive techniques has led to a growth in the interest in clinical and experimental research in this field. This hypothesis is based on the fact that corneal layers with greater stiffness are preserved with this new technique. However, this hypothesis is controversial because clinical research has shown a great disparity in the outcomes. In this review, we performed an in-depth analysis of the factors that might affect corneal biomechanics in laser refractive surgery procedures from a macrostructural to a microstructural viewpoint...
March 31, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29610222/two-year-follow-up-of-corneal-cross-linking-and-refractive-surface-ablation-in-patients-with-asymmetric-corneal-topography
#6
João Baptista N S Malta, H Kaz Soong, Bernardo Kaplan Moscovici, Mauro Campos
AIMS: To evaluate the safety and efficacy of corneal cross-linking (CXL) followed by photorefractive keratectomy (PRK) for refractive correction in patients with bilateral asymmetric topography. METHODS: Forty-four patients (88 eyes) were enrolled in this prospective randomised clinical trial. CXL with subsequent PRK after 6 months was performed in one eye (study group), and PRK alone was performed in contralateral eyes (control group). Patients were followed for 24 months after PRK...
April 2, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29609311/refractive-index-measurements-in-absorbing-media-with-white-light-spectral-interferometry
#7
Yago Arosa, Elena López Lago, Raúl de la Fuente
White light spectral interferometry is applied to measure the refractive index in absorbing liquids in the spectral range of 400-1000 nm. We analyze the influence of absorption on the visibility of interferometric fringes and, accordingly, on the measurement of the refractive index. Further, we show that the refractive index in the absorption band can be retrieved by a two-step process. The procedure requires the use of two samples of different thickness, the thicker one to retrieve the refractive index in the transparent region and the thinnest to obtain the data in the absorption region...
March 19, 2018: Optics Express
https://www.readbyqxmd.com/read/29607216/comparison-of-two-toric-iols-with-different-haptic-design-optical-quality-after-1-year
#8
Kata Miháltz, Michael Lasta, Michael Burgmüller, Pia Veronika Vécsei-Marlovits, Birgit Weingessel
Background: The purpose of this prospective, randomised study was to interocularly compare the visual performance after implantation of two different toric IOLs with different haptic design. Methods: 59 subjects with corneal astigmatism greater than 1.25 diopter (D) were implanted with an AT TORBI 709M IOL (Carl Zeiss Meditec AG) in one eye and with a Tecnis toric aspheric IOL (Abbot Medical Optics) in the other eye. Observation procedure was performed 12 months postoperatively...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29600182/three-year-results-of-small-incision-lenticule-extraction-and-wavefront-guided-femtosecond-laser-assisted-laser-in-situ-keratomileusis-for-correction-of-high-myopia-and-myopic-astigmatism
#9
Li-Kun Xia, Jing Ma, He-Nan Liu, Ce Shi, Qing Huang
AIM: To compare and calculate the 3-year refractive results, higher-order aberrations (HOAs), contrast sensitivity (CS) and dry eye parameters after small incision lenticule extraction (SMILE) and wavefront-guided femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) for correction of high myopia and myopic astigmatism. METHODS: In this prospective, non-randomized comparative study, 78 eyes with spherical equivalent (SE) of -8.11±1.09 diopters (D) received a SMILE surgery, and 65 eyes with SE of -8...
2018: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29590687/comparative-study-of-the-usefulness-of-the-binocular-spot-vision-screener-autorefractor-in-the-detection-of-childhood-visual-disorders
#10
Nathalie Voide, Nicole Hoeckele, Pierre-François Kaeser
BACKGROUND: The Spot Vision Screener (SVS) is designed to detect significant ametropia, anisometropia, and strabismus in non-dilated eyes. This study evaluates the efficacy of the SVS in paediatric visual screening. PATIENTS AND METHODS: All children screened during the paediatric visual screening day in Lausanne in 2016 were evaluated with the SVS, conventional monocular autorefractors, and clinical orthoptic examination. Recommendations for a further eye examination of the SVS were compared with those issued from traditional clinical screenings (monocular refraction and orthoptic examination)...
March 28, 2018: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29582811/application-of-high-intensity-focused-ultrasound-for-treatment-of-open-angle-glaucoma-in-indian-patients
#11
Nilanjana Deb-Joardar, Kasu Prasad Reddy
Purpose: The aim of this study is to assess the efficacy of ultrasound cycloplasty (UCP) in Indian patients with open angle glaucoma (OAG). Methods: A prospective interventional study was designed to treat 73 eyes of 73 patients with OAG with the EyeOP1 device equipped with six miniaturized cylindrical piezoelectric transducers. Two treatment protocols of ultrasound delivery depending on exposure time (8 s and 10 s of shot per transducer) were used. Complete ophthalmic examination, ocular biometry and anterior segment optical coherence tomography were performed preoperatively and patients were followed up at day 1, day 7 and months 1, 2, 3, 6, and 12...
April 2018: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29576880/three-year-outcomes-of-cross-linking-plus-combined-cross-linking-with-femtosecond-laser-intracorneal-ring-segments-implantation-for-management-of-keratoconus
#12
Mohammed Iqbal Hafez Saleem, Hosam A Ibrahim Elzembely, Mortada Ahmed AboZaid, Mohammed Elagouz, Ahmed Mohamed Saeed, Osama Ali Mohammed, Ahmed Gad Kamel
Purpose: To analyze the results of three-year outcomes of combined epithelium-on cross-linking with femtosecond laser ICRS (cross-linking PLUS) for keratoconus management. Design: A retrospective multicenter clinical study. Methods: 43 eyes of 38 patients were subjected to preoperative and postoperative UCVA, BCVA, refraction, Pentacam pachymetry, and keratometry examinations at 3-, 6-, 12-, 24-, and 36-month follow-up period. Results: The preoperative and postoperative mean UCVA was 1...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29564359/femtosecond-laser-assisted-astigmatic-keratotomy-a-review
#13
REVIEW
John S M Chang
Background: Astigmatic keratotomy (AK) remains an accessible means to correct surgically induced or naturally occurring astigmatism. The advantages of femtosecond laser-assisted astigmatic keratotomy (FSAK) over conventional methods have been recognized recently. Main text: This review evaluates the efficacy, complications, and different methods of FSAK for correction of astigmatism in native eyes and those that underwent previous penetrating keratoplasty (PKP)...
2018: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/29561385/silicone-microtube-assisted-scleral-fixation-of-a-posterior-chamber-intraocular-lens
#14
Takuya Kataoka, Motohiro Kamei
PURPOSE: To report a novel technique for intrascleral fixation of a posterior chamber intraocular lens using a silicone microtube to manipulate the haptics into position. METHODS: Intrascleral fixation was performed in six eyes and the results evaluated in this retrospective case series. A silicone microtube with a 0.2-mm external diameter was passed from a sclerocorneal incision through the chamber and a sclerotomy made using a 30-gauge needle. The tips of the intraocular lens haptics were connected to the silicone microtube outside the eye...
March 20, 2018: Retina
https://www.readbyqxmd.com/read/29561350/sulfur-hexafluoride-20-versus-air-100-for-anterior-chamber-tamponade-in-dmek-a-meta-analysis
#15
Raquel Esteves Marques, Paulo Silva Guerra, David Cordeiro Sousa, Nuno Pinto Ferreira, Ana Inês Gonçalves, Ana Miguel Quintas, Walter Rodrigues
PURPOSE: To compare intracameral 20% sulfur hexafluoride (SF6) versus 100% air as tamponade for graft attachment in Descemet membrane endothelial keratoplasty (DMEK). METHODS: Using an electronic database search on MEDLINE and CENTRAL from inception to December 2017, we performed a literature review and meta-analysis including all comparative studies of SF6 at a 20% concentration (20% SF6) versus pure air (100% air) for anterior chamber tamponade in DMEK. The primary outcome was the rebubbling rate at the final observation...
March 20, 2018: Cornea
https://www.readbyqxmd.com/read/29550774/prevalence-and-causes-of-visual-impairment-amongst-older-adults-in-a-rural-area-of-north-india-a-cross-sectional-study
#16
Sumit Malhotra, Praveen Vashist, Mani Kalaivani, Noopur Gupta, Suraj Singh Senjam, Ramashankar Rath, Sanjeev Kumar Gupta
OBJECTIVES: To determine the prevalence, causes and associated factors for visual impairment (VI) in rural population of Jhajjar district, Haryana, north India. METHODS: A community-based, cross-sectional study was conducted in two blocks of Jhajjar district. A total of 34 villages were selected using probability proportionate to size sampling method. Adults aged 50 years and above were selected using compact segment cluster sampling approach. Presenting visual acuity using LogMAR E chart was measured along with collection of other demographic details as part of the house-to-house survey...
March 17, 2018: BMJ Open
https://www.readbyqxmd.com/read/29522229/predictability-of-tunnel-depth-for-intrastromal-corneal-ring-segments-implantation-between-manual-and-femtosecond-laser-techniques
#17
Tiago Monteiro, José F Alfonso, Nuno Franqueira, Fernando Faria-Correia, Renato Ambrósio, David Madrid-Costa
PURPOSE: To compare the predictability of intrastromal tunnel depth creation for intrastromal corneal ring segments (ICRS) implantation between manual dissection and femtosecond laser using a high-resolution anterior segment optical coherence tomography (AS-OCT). METHODS: This multicenter study included patients with keratoconus who had Ferrara-type ICRS implantation at Hospital de Braga using manual dissection and at the Fernandez-Vega Ophthalmological Institute using the femtosecond laser technique...
March 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29522228/the-7-year-outcomes-of-epithelium-off-corneal-cross-linking-in-progressive-keratoconus
#18
Mohamed Shafik Shaheen, Mohamed M Lolah, David P Piñero
PURPOSE: To evaluate the clinical results of epitheliumoff corneal cross-linking (CXL) during a 7-year follow-up. METHODS: This retrospective, non-randomized, single-center interventional study enrolled 34 consecutive eyes of 24 patients with progressive keratoconus undergoing CXL surgery with epithelium removal. Visual, refractive, corneal topographic, pachymetric, and anterior segment changes were evaluated at 1, 3, and 7 years after surgery. RESULTS: Significant reduction of refraction was observed at 1 year postoperatively (P ≤ ...
March 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29522024/evaluation-of-a-flow-cytometry-method-to-determine-size-and-real-refractive-index-distributions-in-natural-marine-particle-populations
#19
Jacopo Agagliate, Rüdiger Röttgers, Michael S Twardowski, David McKee
A flow cytometric (FC) method was developed to retrieve particle size distributions (PSDs) and real refractive index (nr ) information in natural waters. Geometry and signal response of the sensors within the flow cytometer (CytoSense, CytoBuoy b.v., Netherlands) were characterized to form a scattering inversion model based on Mie theory. The procedure produced a mesh of diameter and nr isolines where each particle is assigned the diameter and nr values of the closest node, producing PSDs and particle real refractive index distributions...
March 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29521959/forward-modeling-of-inherent-optical-properties-from-flow-cytometry-estimates-of-particle-size-and-refractive-index
#20
Jacopo Agagliate, Ina Lefering, David McKee
A Mie-based forward modeling procedure was developed to reconstruct bulk inherent optical properties (IOPs) from particle size distributions (PSDs) and real refractive index distributions (PRIDs) obtained using a previously developed flow cytometric (FC) method [Appl. Opt.57, 1705 (2018)APOPAI0003-693510.1364/AO.57.001705]. Given the available PSDs, extrapolations for the particle fraction outside the detection limits of the method and a complex refractive index input (with real part nr directly estimated and imaginary part ni adapted from the literature separately for organic and inorganic components), the model produces volume scattering functions that are integrated to produce scattering and backscattering coefficients, and absorption efficiencies that are used to calculate absorption coefficients...
March 10, 2018: Applied Optics
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