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https://www.readbyqxmd.com/read/28514248/foveal-curvature-and-asymmetry-assessed-using-optical-coherence-tomography
#1
Dean A VanNasdale, Amanda Eilerman, Aaron Zimmerman, Nicky Lai, Keith Ramsey, Loraine T Sinnott
PURPOSE: The aims of this study were to use cross-sectional optical coherence tomography imaging and custom curve fitting software to evaluate and model the foveal curvature as a spherical surface and to compare the radius of curvature in the horizontal and vertical meridians and test the sensitivity of this technique to anticipated meridional differences. METHODS: Six 30-degree foveal-centered radial optical coherence tomography cross-section scans were acquired in the right eye of 20 clinically normal subjects...
May 16, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28512423/refined-internal-limiting-membrane-inverted-flap-technique-for-intractable-macular-detachment-with-optic-disc-pit
#2
Rumiko Hara, Yasutomo Tsukahara, Tsuyoshi Simoyama, Soutarou Mori
PURPOSE: To report a surgical technique for retinal detachment associated with optic disc pit (ODP) by using an internal limiting membrane (ILM) inverted flap as an obstacle between the vitreous cavity and subretinal space. CASE PRESENTATION: A 43-year-old man presented with decreased visual acuity in the right eye for 1 week due to macular detachment associated with ODP. After 2 unsuccessful surgeries, the retina was reattached by vitrectomy with an ILM inverted flap onto the ODP...
January 2017: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28511535/surface-morphology-evolution-mechanisms-of-ingan-gan-multiple-quantum-wells-with-mixture-n2-h2-grown-gan-barrier
#3
Xiaorun Zhou, Taiping Lu, Yadan Zhu, Guangzhou Zhao, Hailiang Dong, Zhigang Jia, Yongzhen Yang, Yongkang Chen, Bingshe Xu
Surface morphology evolution mechanisms of InGaN/GaN multiple quantum wells (MQWs) during GaN barrier growth with different hydrogen (H2) percentages have been systematically studied. Ga surface-diffusion rate, stress relaxation, and H2 etching effect are found to be the main affecting factors of the surface evolution. As the percentage of H2 increases from 0 to 6.25%, Ga surface-diffusion rate and the etch effect are gradually enhanced, which is beneficial to obtaining a smooth surface with low pits density...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28499056/recurrent-macular-detachment-due-to-occult-retinal-break-in-a-patient-with-optic-disc-pit
#4
Xi Chen, John B Miller, Dean Eliott
Serous macular detachment occurs in nearly 50% of eyes with optic disc pit. These macular detachments have been historically difficult to treat. The authors report a case of macular retinal detachment due to an occult juxtapapillary retinal break in a patient with optic disc pit refractory to prior treatments. This case demonstrates that a presumed serous detachment associated with an optic disc pit may have a rhegmatogenous etiology. [Ophthalmic Surg Lasers Imaging Retina. 2017;48:432-434.].
May 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28482872/disturbed-microcirculation-in-the-hands-of-patients-with-systemic-sclerosis-detected-by-fluorescence-optical-imaging-a-pilot-study
#5
Stefanie Friedrich, Susanne Lüders, Stephanie Gabriele Werner, Anne-Marie Glimm, Gerd-Rüdiger Burmester, Gabriela Riemekasten, Marina Backhaus, Sarah Ohrndorf
BACKGROUND: Utilising fluorescence optical imaging (FOI), the distribution of an intravenously applied colouring agent indocyanine green (ICG) can be analysed with the potential to identify malperfusion by little to no tissue enhancement. Systemic sclerosis (SSc) is characterised by the presence of digital ulcers reflecting progressive vasculopathy. The objective was to investigate the potential of FOI in the detection of disturbed microcirculation in the hands and fingers of patients with SSc and to link FOI findings to clinical signs of ischemia such as digital ulcers and pitting scars...
May 8, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28470322/a-one-dimensional-random-laser-based-on-artificial-high-index-contrast-scatterers
#6
Yanyan Wu, Yuhao Ren, Anqi Chen, Zhiyang Chen, Yunfeng Liang, Jinyu Li, Guanlin Lou, Hai Zhu, Xuchun Gui, Shuangpeng Wang, Zikang Tang
The realization of a one-dimensional (1D) random laser (RL) by using artificially fabricated scatterers is reported in this letter, and the lasing characteristic has also been investigated comprehensively. The manipulation of the lasing mode in the 1D microwire (MW) RL can be achieved through micro-pits prepared by the laser-ablation technique. Well-defined sharp lasing peaks were realized based on the coherence feedback process in the 1D optical waveguide. The near- and far-field images exhibit excellent spatial intensity distribution, and the stability of lasing modes has also been investigated...
May 4, 2017: Nanoscale
https://www.readbyqxmd.com/read/28468358/interference-effects-in-laser-induced-plasma-emission-from-surface-bound-metal-micro-particles
#7
Eyal Feigenbaum, Omer Malik, Alexander M Rubenchik, Manyalibo J Matthews
The light-matter interaction of an optical beam and metal micro-particulates at the vicinity of an optical substrate surface is critical to the many fields of applied optics. Examples of impacted fields are laser-induced damage in high power laser systems, sub-wavelength laser machining of transmissive materials, and laser-target interaction in directed energy applications. We present a full-wave-based model that predicts the laser-induced plasma pressure exerted on a substrate surface as a result of light absorption in surface-bound micron-scale metal particles...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28465066/bacterial-adhesion-not-inhibited-by-ion-releasing-bioactive-glass-filler
#8
Kumiko Yoshihara, Noriyuki Nagaoka, Yukinori Maruo, Hidehiko Sano, Yasuhiro Yoshida, Bart Van Meerbeek
OBJECTIVE: Bioactive glasses and surface pre-reacted glass-ionomer (sPRG) filler possess cariostatic properties owing to ion release. Many studies investigated potential cariostatic effects; few studies evaluated the surface stability and the structural changes their surfaces undergo in acidic conditions. METHODS: The surface resistance against acid attack and the surface receptiveness for bacterial adhesion and biofilm formation of a sPRG-filled (Beautifil ll, Shofu) and conventional glass-filled (Herculite XRV Ultra, Kerr) resin-based composite (RBC), and a conventional glass-ionomer cement (GIC; Fuji IX GP Extra, GC) were examined...
April 29, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28459526/organofunctional-silane-modification-of-aluminum-doped-zinc-oxide-surfaces-as-a-route-to-stabilization
#9
Rachael Matthews, Emily Glasser, Samuel Sprawls, Roger H French, Tim Peshek, Emily Pentzer, Ina Martin
Aluminum-doped zinc oxide (AZO) is a low-temperature processed transparent conductive oxide (TCO) made of earth abundant elements; its applications are currently limited by instability to heat, moisture, and acidic conditions. We demonstrate that the application of an organofunctional silane modifier mitigates AZO degradation, and explore the interplay between performance and material composition and morphology. Specifically, we evaluate degradation of bare AZO and APTES (3-aminopropyltriethoxysilane)-modified AZO in response to damp heat (DH, 85 °C, 85 % relative humidity) exposure over 1000 h, then demonstrate how surface modification impacts changes in electrical and optical properties, and chemical composition in one of the most thorough studies to date...
May 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28419404/use-of-evicel-fibrin-sealant-in-optic-disc-pit-associated-macular-detachment
#10
Paulo Ricardo Chaves de Oliveira, Alan Richard Berger, David Robert Chow
Optic disc pit is a rare congenital anomaly of the optic nerve. Retinal detachment is a common complication with poor outcomes. Many surgical alternatives have been described for the treatment of this condition, producing variable results. Herein, the authors describe four cases of optic disc pit-associated macular detachment managed with pars plana vitrectomy, fluid-air exchange, drainage of subretinal fluid through the optic disc pit, temporal peripapillary laser, and application of Evicel fibrin sealant (human) (Ethicon, Bridgewater, NJ) over the optic disc head...
April 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28419402/autologous-free-internal-limiting-membrane-flap-for-optic-nerve-head-pit-with-maculopathy
#11
Palmeera D'Souza, Upendra Babu, Venkatapathy Narendran
Optic disc pits (ODPs) are associated with serous macular detachment (SMD), which causes visual loss in 25% to 75% patients with ODPs. There are various modalities of noninvasive and invasive treatment options; however, the best method of treatment is to seal the optic disc to prevent further egress of fluid into the subretinal space. The authors report a technique that involves sealing of ODPs with autologous free flap of the internal limiting membrane (ILM). After trans pars plana vitrectomy, the ILM was peeled and plugged into the ODP...
April 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28405756/-maculopathy-with-optic-nerve-pits-morphological-criteria-in-sd%C3%AF-%C3%AF-oct
#12
K Wehrmann, S Stumpfe, M Pettenkofer, N Feucht, C Lohmann, M Maier
PURPOSE: Optic pit is a congenital anomaly with malformation similar to coloboma of the optic disc. The cause of optic pit maculopathy is controversial. We used high resolution OCT to investigate changes in the vitreoretinal and vitreopapillary transition within optic pit eyes. METHODS: The vitreoretinal and vitreo-papillary transition of 12 eyes was accurately analyzed using SD-OCT. We registered the following criteria: liquefaction of prepapillary vitreous, papillary vitreous traction, discontinuity within the hyaloid cortex and communication spaces between pit and retinal edema...
April 12, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/28405489/three-dimensional-optical-coherence-tomography-imaging-and-treatment-of-glaucomatous-optic-nerve-head-defects-associated-with-schisis-like-maculopathy
#13
Zafer Öztaş, Jale Menteş, Halil Ateş, Serhad Nalçacı
We present the three-dimensional (3D) spectral-domain optical coherence tomography (SD-OCT) findings of schisis-like maculopathy associated with structural changes of the optic nerve (ON) head as well as the treatment outcomes of a case of advanced glaucoma. In addition to ophthalmological examination, B-scan and 3D-SD-OCT images of the ON head, peripapillary retina, and the macula were obtained. The B-scan images only detected typical retinoschisis findings. However, the 3D-SD-OCT images of the ON head revealed defects of various sizes, shapes, and depths at the outer wall of the prelaminar and laminar regions of the ON canal...
April 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28297038/scleral-autograft-for-optic-nerve-head-pit-associated-chronic-maculopathy
#14
Parag K Shah, Smita S Karandikar, Venkatapathy Narendran
Chronic macular edema is a common finding seen in optic nerve head pits. There is no universally accepted modality present for this condition. Herein, the authors describe a novel surgical technique where a scleral autograft is used to plug the optic pit after microincision vitreous surgery. [Ophthalmic Surg Lasers Imaging Retina. 2017;48:251-254.].
March 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28281133/assessing-the-efficacy-over-time-of-the-addition-of-industrial-by-products-to-remediate-contaminated-soils-at-a-pilot-plant-scale
#15
Raquel González-Núñez, Anna Rigol, Miquel Vidal
The effect of the addition of industrial by-products (gypsum and calcite) on the leaching of As and metals (Cu, Zn, Ni, Pb and Cd) in a soil contaminated by pyritic minerals was monitored over a period of 6 months at a two-pit pilot plant. The contaminated soil was placed in one pit (non-remediated soil), whereas a mixture of the contaminated soil (80% w/w) with gypsum (10% w/w) and calcite (10% w/w) was placed in the other pit (remediated soil). Soil samples and leachates of the two pits were collected at different times...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28198804/investigating-carrier-localization-and-transfer-in-ingan-gan-quantum-wells-with-v-pits-using-near-field-scanning-optical-microscopy-and-correlation-analysis
#16
MinKwan Kim, Sunghan Choi, Joo-Hyung Lee, ChungHyun Park, Tae-Hoon Chung, Jong Hyeob Baek, Yong-Hoon Cho
The V-pits and potential fluctuations in InGaN/GaN multiple quantum wells (MQWs) are key factors for understanding the performance of InGaN/GaN-based light-emitting diodes (LEDs). However, photoluminescence (PL) measurements using conventional optical microscopy only provide ensemble information due to the spatial resolution limit, known as the diffraction barrier, which hinders the analysis of dislocations and potential fluctuations. Here, in order to investigate the influence of the V-pits and potential fluctuations on local optical properties, we performed nanoscopic luminescence mapping for standard and V-pit InGaN/GaN MQWs samples with different sized V-pits using near-field scanning optical microscopy (NSOM) with illumination mode (I-mode) at various laser excitation powers...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28182177/spontaneous-regression-of-optic-disc-pit-maculopathy-in-a-six-year-old-child
#17
Sezin Akça Bayar, Almila Sarıgül Sezenöz, Eylem Yaman Pınarcı, Gürsel Yılmaz
A 6-year-old boy with a complaint of blurred vision for two months was referred to our clinic. His visual acuity was 20/32 in the right eye and 20/20 in the left eye. Optical coherence tomography (OCT) revealed optic disc pit maculopathy in the right eye. The patient was followed for 6 months without any treatment. At the end of the 6-month period, the patient's visual acuity was 20/20 in both eyes. The OCT imaging showed spontaneous regression of the optic disc pit maculopathy. In this case report, it is concluded that in children, spontaneous regression of the optic pit maculopathy with full recovery of visual acuity is possible...
January 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28158008/independently-tunable-dual-band-plasmonically-induced-transparency-based-on-hybrid-metal-graphene-metamaterials-at-mid-infrared-frequencies
#18
Chen Sun, Zhewei Dong, Jiangnan Si, Xiaoxu Deng
A tunable dual-band plasmonically induced transparency (PIT) device based on hybrid metal-graphene nanostructures is proposed theoretically and numerically at mid-infrared frequencies, which is composed of two kinds of gold dolmen-like structures with different sizes placed on separate graphene interdigitated finger sets respectively. The coupled Lorentz oscillator model is used to explain the physical mechanism of the PIT effect at multiple frequency domains. The finite-difference time-domain (FDTD) solutions are employed to simulate the characteristics of the hybrid metal-graphene dual-band PIT device...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28149796/concurrent-optic-disc-pit-and-retinal-cavernous-hemangioma
#19
Alec L Amram, Renata Picciani, Jaafar El-Annan
No abstract text is available yet for this article.
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28122368/structural-analysis-of-enamel-in-teeth-from-head-and-neck-cancer-patients-who-underwent-radiotherapy
#20
Cristhian C Madrid, Mariana de Pauli Paglioni, Sergio R Line, Karina G Vasconcelos, Thaís Bianca Brandão, Marcio A Lopes, Alan Roger Santos-Silva, Mario Fernando De Goes
OBJECTIVE: To analyze macroscopic, microscopic, and ultrastructural aspects of enamel from head-and-neck cancer patients submitted to radiotherapy. MATERIALS AND METHODS: Twenty sound extracted permanent molars were used and divided into 2 groups. The experimental group consisted of 10 molars from head-and-neck cancer patients submitted to radiotherapy with total doses that ranged from 50 to 70 Gy. Ten molars from patients who did not receive radiotherapy were matched with experimental-group samples by anatomic tooth group and comprised the control group...
2017: Caries Research
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