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https://www.readbyqxmd.com/read/29036141/gloss-evaluation-from-soft-and-hard-metrologies
#1
Zihao Wang, Lihao Xu, Yu Hu, Fereshteh Mirjalili, Ming Ronnier Luo
Recent advances in bidirectional reflectance distribution function (BRDF) acquisitions have provided a novel approach for appearance measurement and analysis. In particular, since gloss appearance is dependent on the directional reflective properties of surfaces, it is reasonable to leverage the BRDF for gloss evaluation. In this paper, we investigate gloss appearance from both soft metrology and hard metrology. A psychophysical experiment was conducted for the gloss assessment of 47 neutral-color samples. In the evaluation of gloss perception from gloss meter measurements, we report several ambiguous correspondences in the medium gloss range...
September 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29036050/auto-white-balance-by-surface-reflection-decomposition
#2
Ying-Yi Li, Hsien-Che Lee
Auto white balance (AWB) is an important operation in color imaging applications. Most existing AWB algorithms rely on some physical features and statistical properties of natural scenes. However, the AWB algorithms using statistical properties are sensitive to the statistics of the scene contents. Therefore, it is highly desirable to find physical features that are more robust and relatively insensitive to scene contents. In this paper, we propose such physical features based on surface reflection decomposition...
October 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29030797/corneal-endothelial-changes-following-a-single-session-of-selective-laser-trabeculoplasty-for-pseudoexfoliative-glaucoma
#3
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
https://www.readbyqxmd.com/read/29026683/high-sensitivity-optical-measurement-of-skin-gloss
#4
Anna Ezerskaia, Arno Ras, Pascal Bloemen, Silvania F Pereira, H Paul Urbach, Babu Varghese
We demonstrate a low-cost optical method for measuring the gloss properties with improved sensitivity in the low gloss regime, relevant for skin gloss properties. The gloss estimation method is based on, on the one hand, the slope of the intensity gradient in the transition regime between specular and diffuse reflection and on the other on the sum over the intensities of pixels above threshold, derived from a camera image obtained using unpolarized white light illumination. We demonstrate the improved sensitivity of the two proposed methods using Monte Carlo simulations and experiments performed on ISO gloss calibration standards with an optical prototype...
September 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29022296/efficacy-and-safety-of-intracameral-bevacizumab-for-treatment-of-neovascular-glaucoma
#5
Jun Young Ha, Mi Sun Sung, Sang Woo Park
PURPOSE: To evaluate the long-term efficacy and safety of intracameral bevacizumab in patients with neovascular glaucoma. METHODS: This retrospective study included 26 eyes of 26 neovascular glaucoma patients who received intracameral bevacizumab injection between January 2013 and May 2015, and were followed-up for at least 1 year. All patients were treated with topical and/or systemic intraocular pressure (IOP)-lowering medications, intracameral bevacizumab, and panretinal photocoagulation (PRP)...
August 26, 2017: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/28993974/unique-variations-and-characteristics-of-iridocorneal-endothelial-syndrome-in-china-a-case-series-of-58-patients
#6
Bo Feng, Xin Tang, Hong Chen, Xia Sun, Ningli Wang
PURPOSE: Iridocorneal endothelial (ICE) syndrome is a rare condition, and unique characteristics in Chinese patients can make diagnosis difficult. Our purpose was to describe the clinical characteristics and variations of ICE syndrome in 58 consecutive Chinese patients. METHODS: The clinical data of consecutive patients with ICE syndrome who were seen between 2008 and 2011 at the glaucoma clinic of our ophthalmology department were retrospectively reviewed. The diagnostic criteria for ICE syndrome were a "hammered-silver" appearance of the corneal endothelium and specular microscopy showing ICE cells characterized by the absence of a hexagonal appearance, dark areas within the cells, and a light-dark reversal pattern...
October 10, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28985815/young-donor-graft-assisted-endothelial-keratoplasty-pdek-dmek-with-epithelial-debridement-for-chronic-pseudophakic-bullous-keratopathy
#7
Amar Agarwal, Priya Narang, Dhivya A Kumar, Ashvin Agarwal
OBJECTIVE: The aim of this study was to describe the applicability and report visual outcomes for the treatment of subepithelial fibrosis and anterior stromal scarring in cases of chronic pseudophakic bullous keratopathy (PBK) with epithelial debridement and endothelial keratoplasty (EK) (pre-Descemet endothelial keratoplasty [PDEK]; Descemet membrane endothelial keratoplasty [(DMEK]) using young donor tissue. DESIGN: Prospective, single-centre, interventional study...
October 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28984756/preoperative-photocoagulation-reduces-corneal-endothelial-cell-damage-after-vitrectomy-in-patients-with-proliferative-diabetic-retinopathy
#8
Jie Zhong, Jun Jia, Jiguo Yu, Liping Zhang, Yi Xiang
Proliferative diabetic retinopathy (PDR) is a severe complication of diabetes and is a leading cause of visual decline and irreversible blindness. So we designed this study to investigate retrospectively the effect of preoperative photocoagulation on corneal endothelial cells after vitrectomy in patients with PDR.The study included 52 eyes of 46 patients with PDR complicated with vitreous hemorrhage, who underwent vitrectomy. Patients were apportioned to a photocoagulation group (26 eyes/23 patients) or nonphotocoagulation group (26/23 patients), according to their history of preoperative photocoagulation...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28979090/effects-of-temperature-and-fluid-media-on-the-scroll-width-size-of-the-descemet-s-membrane-endothelial-keratoplasty-dmek-donor-graft
#9
Ellen H Koo, Allen O Eghrari, Ryan S Meshkin, Wei Shi, William J Feuer, Karen G DeMarco, Arthur C Kurz
AIM: Our study was conducted to evaluate whether higher temperature leads to increased - or wider - scroll widths of the Descemet's membrane endothelial keratoplasty (DMEK) donor graft. PURPOSE: To investigate the effects of temperature and fluid media on the DMEK donor graft scroll widths. MATERIALS AND METHODS: This research work was a laboratory investigation. Baseline cell count was taken via specular microscopy for the donor corneas at room temperature (20°C-25°C)...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28974221/femtosecond-laser-assisted-cataract-surgery-in-patients-with-phakic-intraocular-lenses-and-low-endothelial-cell-counts-a-case-report
#10
Chia-Yi Lee, Shih-Chun Chao, Chi-Chin Sun, Hung-Yu Lin
BACKGROUND: Phakic intraocular lens (PIOL) implantation has been used to correct myopia and myopic astigmatism, although corneal decompensation can occur after implantation. Femtosecond laser-assisted cataract surgery (FLACS) has gained in popularity due to its lower postoperative astigmatism and endothelial loss. Herein, we report the use of FLACS in patients who previously received PIOL implantation and have a low corneal endothelial cell count. CASE PRESENTATION: Two patients with a previous iris-claw PIOL implantation were enrolled...
October 3, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28972777/coupled-effects-of-spreading-solvent-molecules-and-electrostatic-repulsions-on-the-behavior-of-ps-b-paa-monolayers-at-the-air-water-interface
#11
Zineb Guennouni, Michel Goldmann, Marie-Claude Fauré, Philippe Fontaine, Patrick Perrin, Denis Limagne, Fabrice Cousin
We describe the surface behavior of PS-b-PAA monolayers at the air/water interface using N,N-dimethyformamide (DMF) as spreading solvent. At low pH, when the PAA blocks are neutral, the surface pressure versus molecular area isotherm shows a pseudoplateau associated with the presence of remaining solvent spreading molecules in the monolayer, as we described in a former study (Guennouni et al, Langmuir, 2016). We show here that the width of the plateau decreases when increasing pH up to its complete disappearance at high pH, when PAA blocks are fully charged, although there still exist two regimes of compressibilities on the isotherm...
October 3, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28964201/geometric-optimisation-of-an-accurate-cosine-correcting-optic-fibre-coupler-for-solar-spectral-measurement
#12
Roberto Cahuantzi, Alastair Buckley
Making accurate and reliable measurements of solar irradiance is important for understanding performance in the photovoltaic energy sector. In this paper, we present design details and performance of a number of fibre optic couplers for use in irradiance measurement systems employing remote light sensors applicable for either spectrally resolved or broadband measurement. The angular and spectral characteristics of different coupler designs are characterised and compared with existing state-of-the-art commercial technology...
September 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28953390/probing-dielectric-properties-of-metal-organic-frameworks-mil%C3%A2-53-al-as-a-model-system-for-theoretical-predictions-and-experimental-measurements-via-synchrotron-far-and-mid-infrared-spectroscopy
#13
Kirill Titov, Zhixin Zeng, Matthew R Ryder, Abhijeet Chaudhari, Bartolomeo Civalleri, Chris S Kelley, Mark D Frogley, Gianfelice Cinque, Jin-Chong Tan
Emerging nanoporous materials, such as metal-organic frameworks (MOFs), are promising low-k dielectrics central to next-generation electronics and high-speed communication. Hitherto, the dielectric characterization of MOFs is scarce, with very limited experimental data for guiding new materials design and synthesis. Herein we demonstrate the efficacy of high-resolution synchrotron infrared (IR) specular reflectance experiments, to study the dynamic dielectric properties of a flexible MOF structure: bi-stable MIL-53(Al) that exhibits switching between a large pore (LP) and a narrow pore (NP) architecture...
September 27, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28949762/focusing-of-a-rydberg-positronium-beam-with-an-ellipsoidal-electrostatic-mirror
#14
A C L Jones, J Moxom, H J Rutbeck-Goldman, K A Osorno, G G Cecchini, M Fuentes-Garcia, R G Greaves, D J Adams, H W K Tom, A P Mills, M Leventhal
Slow atoms in Rydberg states can exhibit specular reflection from a cylindrical surface upon which an azimuthally periodic potential is imposed. We have constructed a concave mirror of this type, in the shape of a truncated oblate ellipsoid of revolution, which has a focal length of (1.50±0.01)  m measured optically. When placed near the center of a long vacuum pipe, this structure brings a beam of n=32 positronium (Ps) atoms to a focus on a position sensitive detector at a distance of (6.03±0.03) m from the Ps source...
August 4, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28940588/mediastinal-ectopic-thyroid-diagnosed-by-endobronchial-ultrasound-guided-transbronchial-needle-aspiration-report-of-three-cases
#15
Ayperi Ozturk, Tugba Cicek, Zafer Aktas, Funda Demirag, Aydin Yilmaz
An ectopic thyroid gland results from the abnormal migration of the thyroid in the course of its development. Primary ectopic mediastinal thyroid is very rare and occurs in less than 1% of all goiters that can be surgically excised. Ectopic thyroid tissue has a characteristic sonographic appearance as smooth-bordered, homogeneous, hypoechoic tissue with fine specular echoes. We report 3 cases of mediastinal ectopic thyroid diagnosed by endobronchial ultrasound-guided transbrochial needle aspiration biopsy.
September 22, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/28938379/dark-endothelial-spots-after-descemet-membrane-endothelial-keratoplasty-may-appear-as-recurrent-fuchs-dystrophy-or-herald-graft-failure-or-rejection
#16
Vasiliki Zygoura, Lamis Baydoun, Claire Monnereau, Maria Satué, Silke Oellerich, Gerrit R J Melles
PURPOSE: To evaluate the clinical significance of dark spots in the donor endothelial cell layer as observed with specular microscopy, in patients who underwent Descemet membrane endothelial keratoplasty (DMEK) for Fuchs endothelial dystrophy (FED). METHODS: Specular microscopy images of 83 consecutive eyes up to 7 years after DMEK were retrospectively reviewed in a masked fashion for the presence of dark spots and morphologic changes in the endothelial cell layer and processed for endothelial cell density (ECD) measurements...
September 21, 2017: Cornea
https://www.readbyqxmd.com/read/28936050/comparative-evaluation-of-corneal-endothelium-in-patients-with-diabetes-undergoing-phacoemulsification
#17
COMPARATIVE STUDY
Pramod K Sahu, Gopal K Das, Sumeet Agrawal, Sabitabh Kumar
PURPOSE: The purpose of this study is to determine if phacoemulsification with posterior chamber foldable intraocular lens implantation has a greater impact on the corneal endothelium of type 2 diabetic patients as compared to nondiabetic controls. MATERIALS AND METHODS: This study compared the corneal endothelial status in sixty patients with diabetes with good glycemic control and sixty nondiabetic controls before and after (1 week, 1 month, 2 month, and 3 month) uneventful phacoemulsification...
April 2017: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/28914231/plasmonic-resonances-in-hybrid-systems-of-aluminum-nanostructured-arrays-and-few-layer-graphene-within-the-uv-ir-spectral-range
#18
Ricardo González-Campuzano, J M Saniger, Doroteo Mendoza
The size-controllable and ordered Al nanocavities and nanodomes arrays were synthesized by electrochemical anodization of aluminum using phosphoric acid, citric acid and mixture both acids. Few layer graphene (FLG) was transferred directly on top of Al nanostructures and their morphology were evaluated by Scanning Electron Microscopy. The interaction between FLG and the plasmonic properties of Al nanostructures arrays were investigated based on specular reflectivity in the UV-Vis-IR range and Raman Spectroscopy...
September 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28913537/a-metal-lustrous-porphyrin-foil
#19
Mitsuhiko Morisue, Yuki Hoshino, Masaki Shimizu, Shogo Tomita, Sono Sasaki, Shinichi Sakurai, Takaaki Hikima, Ayaka Kawamura, Michinari Kohri, Jun Matsui, Takeshi Yamao
A metal-lustrous self-standing film, named "porphyrin foil", was formed from a glass-forming polymeric porphyrin. The amorphous glass nature of the porphyrin foil played a key role in spontaneously producing a smooth surface. Its sharp contrast in intense absorption and specular reflection of light at each wavelength provided a brilliant metallic lustre.
September 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28886202/fuchs-endothelial-corneal-dystrophy-and-rna-foci-in-patients-with-myotonic-dystrophy
#20
V Vinod Mootha, Brock Hansen, Ziye Rong, Pradeep P Mammen, Zhengyang Zhou, Chao Xing, Xin Gong
Purpose: The most common cause of Fuchs' endothelial corneal dystrophy (FECD) is an intronic CTG repeat expansion in TCF4. Expanded CUG repeat RNA colocalize with splicing factor, muscleblind-like 1 (MBNL1), in nuclear foci in endothelium as a molecular hallmark. Myotonic dystrophy type 1 (DM1) is a neuromuscular disorder caused by a CTG repeat expansion in the 3'-untranslated region (UTR) of DMPK. In this study, we examine for RNA-MBNL1 foci in endothelial cells of FECD subjects with DM1, test the hypothesis that DM1 patients are at risk for FECD, and determine prevalence of TCF4 and DMPK expansions in a FECD cohort...
September 1, 2017: Investigative Ophthalmology & Visual Science
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