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https://www.readbyqxmd.com/read/29328122/model-assisted-measuring-method-for-periodical-sub-wavelength-nanostructures
#1
Gabriela Alexe, Andreas Tausendfreund, Dirk Stöbener, Andreas Fischer
This paper describes a scatterometry approach designed by simulations for the in-line characterization of sub-wavelength sinusoidal gratings, which are formed on a transparent foil in a roll-to-roll procedure. Currently used methods are based on series of in situ measurements of the specular optical response at different incident angles or wavelengths for acquiring dimensional information on the gratings. The capability of single measurements of the first diffraction maxima at a fixed incident angle and wavelength to accurately measure the height of the sub-wavelength sinusoidal gratings is investigated in this work...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29303887/correlation-between-postoperative-central-corneal-thickness-and-endothelial-damage-after-cataract-surgery-by-phacoemulsification
#2
Jean Marc Perone, Mathilde Boiche, Louis Lhuillier, Francis Ameloot, Shamour Premy, Anne-Laure Jeancolas, Christophe Goetz, Estelle Neiter
PURPOSE: To study the correlation between postoperative corneal edema and endothelial cell loss after cataract surgery by microcoaxial phacoemulsification. METHODS: Eighty-five eyes of 85 consecutive patients with mild cataract (up to C5, N4, and P5: per LOCS III classification) were included in a prospective study from September 2014 to November 2014. Eighty-five eyes were necessary to obtain a precision of 0.15 for computation of the Pearson correlation coefficient...
January 4, 2018: Cornea
https://www.readbyqxmd.com/read/29302788/wide-field-contact-specular-microscopy-analysis-of-corneal-endothelium-post-trabeculectomy
#3
Naoki Okumura, Daiki Matsumoto, Yugo Okazaki, Noriko Koizumi, Chie Sotozono, Shigeru Kinoshita, Kazuhiko Mori
PURPOSE: This study investigates the possible role of the filtration bleb in the continuous decrease in corneal endothelial cell (CEC) density observed following trabeculectomy. METHODS: This study involved 51 eyes of 37 glaucoma patients who underwent trabeculectomy. The CEC density was determined by contact specular microscopy in three areas: (1) the cornea center, (2) near the trabeculectomy filtration bleb, and (3) the opposite side of the bleb. The eyes were grouped according to post-surgical follow-up years: 0-1 (Group 1), 1-2 (Group 2), 2-3 (Group 3), 3-4, (Group 4), and 4+ years (Group 5)...
January 4, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29234234/mini-descemet-membrane-stripping-m-dmes-in-patients-with-fuchs-endothelial-dystrophy-a-new-method
#4
George D Kymionis, Dimitrios A Liakopoulos, Michael A Grentzelos, Irini Naoumidi, Georgios A Kontadakis, Konstantinos I Tsoulnaras, Myrsini K Petrelli
We present two cases with focal corneal edema due to Fuchs' endothelial dystrophy that were successfully treated with mini Descemet membrane stripping (m-DMES) (diameter of 3-4 mm; at the area of preexisting focal corneal edema) without endothelial replacement during cataract surgery. Specular microscopy demonstrated Fuchs' endothelial dystrophy and histopathologic evaluation confirmed the diagnosis. Anterior segment optical coherence tomography and confocal microscopy were used for the evaluation of the corneal tissue recovery course after the surgical procedure...
October 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/29213190/smartphone-based-imaging-of-the-corneal-endothelium-at-sub-cellular-resolution
#5
Devrim Toslak, Damber Thapa, Muhammet Kazim Erol, Yanjun Chen, Xincheng Yao
This aim of this study was to test the feasibility of smartphone-based specular microscopy of the corneal endothelium at a sub-cellular resolution. Quantitative examination of endothelial cells is essential for evaluating corneal disease such as determining a diagnosis, monitoring progression and assessing treatment. Smartphone-based technology promises a new opportunity to develop affordable devices to foster quantitative examination of endothelial cells in rural and underserved areas. In our study, we incorporated an iPhone 6 and a slit lamp to demonstrate the feasibility of smartphone-based microscopy of the corneal endothelium at a sub-cellular resolution...
2017: Journal of Modern Optics
https://www.readbyqxmd.com/read/29208818/corneal-edema-after-phacoemulsification
#6
REVIEW
Namrata Sharma, Deepali Singhal, Sreelakshmi P Nair, Pranita Sahay, S S Sreeshankar, Prafulla Kumar Maharana
Phacoemulsification is the most commonly performed cataract surgery in this era. With all the recent advances in investigations and management of cataract through phacoemulsification, most of the patients are able to achieve excellent visual outcome. Corneal edema after phacoemulsification in the immediate postoperative period often leads to patient dissatisfaction and worsening of outcome. Delayed onset corneal edema often warrants endothelial keratoplasty. This review highlights the etiopathogenesis, risk factors, and management of corneal edema in the acute phase including descemet's membrane detachment (DMD) and toxic anterior segment syndrome...
December 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29199864/intracameral-use-of-nepafenac-safety-and-efficacy-study
#7
Ramesh Jha, Vismapratap Sur, Arnab Bhattacharjee, Tanushri Ghosh, Vinod Kumar, Aditya Konar, Sarbani Hazra
PURPOSE: To test the intracameral safety of nepafenac and its efficacy in inhibiting prostaglandin synthesis during phacoemulsification surgery. METHODS: The safety evaluation was conducted in normal eyes of rabbits, 0.1ml of 0.3% and 1% nepafenac was injected intracamerally. Extensive studies to detect adverse response ranged from a gross examination of eyes under slit lamp biomicroscope, fluorescein dye test, Schirmer tear test, test for corneal sensitivity, intraocular pressure measurement (IOP), specular microscopy, electroretinography(ERG), and histopathological examination of intraocular tissues...
December 4, 2017: Current Eye Research
https://www.readbyqxmd.com/read/29160544/corneal-endothelial-cell-density-and-pterygium-a-cross-sectional-study
#8
Hugo Coelho Carvalho Sousa, Ludmila Nascimento Pinto Silva, Patrick Frensel Tzelikis
PURPOSE: To investigate the effects of pterygium on corneal endothelial cell density in patients with unilateral pterygium. METHODS: We performed a cross-sectional analysis of data from patients with unilateral pterygium who were selected from September 1, 2015 to July 31, 2016 at Hospital de Base do Distrito Federal to assess the corneal endothelial cell density, coefficient of variation in the cell area, hexagonality, and corneal pa-chymetric results. In all patients, noncontact specular microscopy was performed in both eyes and a minimum endothelial cell count of 75 cells/mm2 was required for inclusion in the study...
September 2017: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/29133638/comparison-of-the-endosaver-with-noninjector-techniques-in-descemet-s-stripping-endothelial-keratoplasty
#9
COMPARATIVE STUDY
Michael Tsatsos, Ioannis Athanasiadis, Nikolaos Kopsachilis, Radhika Krishnan, Parwez Hossain, David Anderson
PURPOSE: Minimal loss of corneal endothelial cells during corneal transplantation is a major target but remains a point of controversy among specialists. Hence, the available method to best achieve this continues to stir progress in the field. The aim of this study is to evaluate the use of the Endosaver injector device for graft insertion in Descemet's stripping endothelial keratoplasty (DSEK) and compare the visual outcomes and endothelial cell survival between the Endosaver injector and Goosey grasping forceps insertion techniques...
November 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29120464/insight-on-the-silver-catalyst-distribution-during-silicon-nanowire-array-formation-an-x-ray-reflectivity-study
#10
Jesse W Kremenak, Christopher J Arendse, Franscious R Cummings, Yiyao Chen, Paul F Miceli
Although metal-catalysts are commonly used to create nanoscale materials at surfaces, little is quantitatively known or understood about the depth distribution profile of the catalyst during the growth process. Using X-ray reflectivity, we report the first quantitative investigation, with nanoscale resolution, of the Ag metal-catalyst depth distribution profile during metal-assisted chemical etch (MACE) growth of Si nanowire (SiNW) arrays on Si(100). Given the very low optical reflectivity of these nanowire arrays, specular reflection from these materials in the X-ray region is extremely challenging to measure because it probes interfaces on the nanoscale...
November 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/29119310/on-the-regional-variability-of-averaged-cell-area-estimates-for-the-human-corneal-endothelium-in-relation-to-the-extent-of-polymegethism
#11
M J Doughty
PURPOSE: To assess variability in the coefficient of variation (COV) in cell area estimates when using different numbers of cells for endothelial morphometry. METHODS: Using non-contact specular microscopy images of the corneal endothelium, 4 sets of 20 cases were selected that included 200 cells and had overall (global) COV values of less than 30 (group 1), 31-40 (group 2), 41-50 (group 3) and over 50% (group 4). Subjects could be normal, or had ophthalmic disease (such as diabetes), a history of rigid or soft contact lens wear or were assessed after cataract surgery...
November 7, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/29111821/correlations-of-corneal-optical-densitometry-endothelial-hexagonality-percentage-and-epithelium-thickness
#12
Gökhan Pekel, Fatih Özbakış, Alperen Bahar, Evre Pekel, Ebru Nevin Çetin
PURPOSE: Our aim was to examine the associations between the cornea morphological parameters, endothelial cell density, and anterior chamber measurements. METHODS: This observational study included 50 eyes of 50 healthy volunteers. The thicknesses of corneal epithelium, Bowman's layer, stroma, Descemet's membrane-endothelium complex, and pre-ocular tear film were measured by means of anterior segment optical coherence tomography. The keratometry (K), corneal volume (CV), corneal optical densitometry (COD), iridocorneal angle (ICA), anterior chamber depth (ACD), and anterior chamber volume (ACV) measurements were taken by the Scheimpflug anterior segment imaging...
November 7, 2017: Current Eye Research
https://www.readbyqxmd.com/read/29109893/correlation-of-corneal-endothelial-cell-density-with-corneal-tomographic-parameters-in-eyes-with-keratoconus
#13
Banu Bozkurt, Mevlüt Yılmaz, Ali Meşen, Ümit Kamış, Bengü Ekinci Köktekir, Süleyman Okudan
Objectives: To examine changes in corneal endothelial cell density (ECD) in different stages of keratoconus and evaluate its correlation with corneal tomographic parameters. Materials and Methods: Two hundred six patients with keratoconus were enrolled in the study. Corneal topography was performed by Sirius (CSO, Italy), which has a rotating Scheimpflug camera and a Placido disc topographer. Automatic endothelial analysis was done with the non-contact endothelial microscope (20x probe) of Confoscan-4 (NIDEK, Japan)...
October 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/29090046/preparation-and-thickness-profile-of-endothelial-keratoplasty-lenticules-from-donated-whole-eyes-with-previous-photorefractive-keratectomy
#14
Mozhgan Rezaei Kanavi, Pejman Fahim, Mohsen Rahmanian, Tahereh Chamani, Bahar Kheiri, Sahar Balagholi, Mohammad Ali Javadi
PURPOSE: To describe the preparation and thickness profiles of endothelial keratoplasty lenticules harvested from eyes with previous photorefractive keratectomy (PRK). METHODS: Donor whole eyes that underwent PRK were subjected to microkeratome-assisted dissection for Descemet stripping automated endothelial keratoplasty. Specular microscopy and Visante optical coherence tomography were performed on precut corneas. Endothelial cell indices and thickness profiles of endothelial keratoplasty lenticules were statistically analyzed...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29076809/compact-3d-printed-module-for-fluorescent-and-label-free-imaging-using-evanescent-excitation
#15
Vikas Pandey, Shalini Gupta, Ravikrishnan Elangovan
Total internal reflection fluorescence (TIRF) microscopy is widely used for selective excitation and high-resolution imaging of fluorophores, and more recently label-free nanosized objects, with high vertical confinement near a liquid/solid interface. Traditionally, high numerical aperture (NA) objectives (> 1.4) are used to simultaneously generate evanescent waves and collect fluorescence emission signals which limits their use to small area imaging (< 0.1 mm2). Objective-based TIRFs are also expensive as they require dichroic mirrors and efficient notch filters to prevent specular reflection within the objective lenses...
October 27, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/29073200/torsional-phacoemulsification-a-pilot-study-to-revise-the-harm-scale-evaluating-the-endothelial-damage-and-the-visual-acuity-after-cataract-surgery
#16
Francesco Saverio Sorrentino, Silvia Matteini, Aurelio Imburgia, Claudio Bonifazzi, Adolfo Sebastiani, Francesco Parmeggiani
PURPOSE: To study the effect of torsional phacoemulsification energy on corneal endothelium evaluating the relationship between changes of endothelial cells and postoperative visual acuity. METHODS: This prospective clinical observational cohort study included 50 patients with cataract who underwent torsional phacoemulsification. Sequential quantitative and qualitative morphometric endothelial cell analyses of the cornea were performed four weeks preoperatively and six weeks postoperatively using noncontact specular microscopy...
2017: PloS One
https://www.readbyqxmd.com/read/29059495/2d-spherulites-of-a-semi-fluorinated-alkane-controlled-access-to-either-radial-or-ring-banded-morphologies
#17
Xianhe Liu, Salomé Mielke, Christophe Contal, Damien Favier, Akihisa Yamamoto, Motomu Tanaka, Marie Pierre Krafft
Thin films of a semi-fluorinated alkane cast onto solid substrates consist of well-formed two-dimensional non-birefringent ring-banded and/or radial spherulites. Controlling the experimental conditions allows orientation of the crystallization toward either radial-only or ring-banded-only morphologies. Intermediate states were also captured in which both radial and ring-banded spherulites coexist. Monitoring of the formation of these intermediate states brought evidence for a first crystallization mode that sweeps radially outwards from a central nucleus until the propagating front edge experiences a second crystallization mode that proceeds through a diffusion-controlled rhythmic crystallization mechanism that leads to high (≈2 μm) concentric ridges...
October 23, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29044058/femtosecond-laser-assisted-cataract-surgery-versus-2-2-mm-clear-corneal-phacoemulsification
#18
COMPARATIVE STUDY
H Ranjini, Praveen R Murthy, Gowri J Murthy, Vinay R Murthy
PURPOSE: Phacoemulsification is the surgical procedure of choice for cataract, providing excellent visual and safety outcomes. Femtosecond laser-assisted cataract surgery (FLACS) is an addition to the surgical armamentarium. The study aims to compare the outcomes of FLACS using LenSx™ (Alcon Inc., USA) to standard 2.2 mm clear corneal phacoemulsification. Prospective case-control, comparative, interventional study was conducted in a tertiary care center. METHODS: In each group, 55 eyes of 55 patients underwent cataract surgery using either FLACS or conventional phacoemulsification (control group)...
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29041135/improved-performance-of-multi-view-fringe-projection-3d-microscopy
#19
Meng Wang, Yongkai Yin, Dingnan Deng, Xiangfeng Meng, Xiaoli Liu, Xiang Peng
Fringe projection 3D microcopy (FP-3DM) plays an increasingly important role in micro manufacturing and measurement. In recent decades, research on FP-3DM has made considerable progress. Nevertheless, some disadvantages arising from the limited depth of field, local specular reflection and occlusion still exist and need to be further addressed. In this paper, a multi-view FP-3DM (MVFP-3DM) is presented. Four imaging branches with the Scheimpflug condition and one vertical projection branch are deployed to establish the system...
August 7, 2017: Optics Express
https://www.readbyqxmd.com/read/29030797/corneal-endothelial-changes-following-a-single-session-of-selective-laser-trabeculoplasty-for-pseudoexfoliative-glaucoma
#20
Nurgül Örnek, Kemal Örnek
PURPOSE: To evaluate corneal endothelial cell parameters after a single session of selective laser trabeculoplasty (SLT) in pseudoexfoliative glaucoma (PEG) patients. METHODS: Corneal endothelial cell parameters of 18 PEG patients were compared with 18 healthy subjects following SLT treatment. All patients underwent SLT treatment to 180 degrees of inferior trabecular meshwork. Corneal measurements were performed using specular microscopy (Noncon Robo SP8000, Konan Medical, Hyogo, Japan)...
October 13, 2017: International Ophthalmology
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