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PubMed Journals Articles About "Adjustable Glasses Custom Standard Glasses Ready Made Glasses" RSS

01:29 EST 20th January 2020 | BioPortfolio

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Showing "Adjustable glasses Custom standard glasses Ready made glasses" PubMed Articles 1–25 of 9,700+

Feasibility of monitoring compliance with intermittent occlusion therapy glasses for amblyopia treatment.

Liquid crystal glasses use an intermittent occlusion technique and may improve compliance compared to adhesive patches. Previous studies support the effectiveness of intermittent occlusion therapy (IO therapy) glasses for amblyopia treatment. However, objective compliance for these glasses has not been measured. The purpose of this study was to investigate the feasibility of using a microsensor to monitor objective compliance with IO therapy glasses.


ESTIMATION OF Hp(3) TO THE EYE LENS OF INTERVENTIONAL RADIOLOGISTS-RELATION BETWEEN THE EYE LENS DOSE AND RADIOLOGIST'S HEIGHT.

The aim of the study was to estimate occupational radiation dose to the eye lens of radiologists and the dose reduction ratio of lead glasses during interventional radiology. Three interventional radiologists monitored Hp(3) using small-type optically stimulated luminescence dosemeters attached to the left inside and outside of the lead glasses with 0.07-mmPb [Hp(3)eye]. Hp(10) and Hp(0.07) were monitored, respectively, by attaching the personal dosemeter to the lead neck collar above the lead apron. The me...

THE IMPACT ON THE EYE LENS OF RADIATION EMITTED BY NATURAL RADIONUCLIDES (LEAD-210) PRESENT IN RADIATION PROTECTION GLASSES.

Most radiation protection items made from modern lead contain 210Pb. This study estimated the impact on eye lens of radiation derived from the 210Pb in three types of radiation protection glasses. The counts from the glasses were measured using a Geiger-Müeller survey meter. The net count rate was 92 ± 1 cpm at a distance of 0.5 cm for one type of glasses. Additionally, we conducted a qualitative γ-ray spectrum analysis using a high-purity germanium semiconductor detector. The absorbed dose in the ey...


A study of the underestimation of eye lens dose with current eye dosemeters for interventional clinicians wearing lead glasses.

The reduction in the occupational dose limit of the eye lens has created the need for optimizing eye protection and dose assessment, in particular for interventional clinicians. Lead glasses are one of the protection tools for shielding the eyes, but assessing the eye lens dose when these are in place remains challenging. In this study, we evaluated the impact of the position of Hp(3) dosemeters on the estimated eye lens dose when lead glasses are used in interventional settings. Using the Monte Carlo metho...

A Randomized Clinical Trial of Immediate versus Delayed Glasses for Moderate Hyperopia in Children 3 to 5 Years of Age.

To compare VA and binocularity outcomes in moderately hyperopic children with normal VA and binocularity assigned to glasses versus observation.

Oxychloride glass with low phonon energy as a choice for infrared laser materials.

Recently, rare-earth-doped infrared (IR) luminescent glasses have drawn massive attention due to their potential applications in military, medical, and communications fields. In this Letter, we present a system of oxychloride Si-Ge-O-Cl glasses, suitable for rare-earth doping, which has been developed as a new, to the best of our knowledge, choice for IR luminescent materials. Raman spectra show a looser glass network because of the decreased phonon energy and density compared to the one in heavy-metal oxid...

Surface-Bulk Interplay in Vapor-Deposited Glasses: Crossover Length and the Origin of Front Transformation.

Thin film stable glasses transform into a liquid by a moving front that propagates from surfaces or interfaces with higher mobility. We use calorimetric data of vapor-deposited glasses of different thicknesses and stabilities to identify the role of glassy and liquid dynamics on the transformation process. By invoking the existence of an ultrathin intermediate layer whose transformation strongly depends on the properties of both the liquid and the glass, we show that the recovery to equilibrium is driven by...

Innovative Use of Google Cardboard in Clinical Examination of Patients of Vertigo.

Vertigo is 1 of the most prominent and frequent neurological symptom. It is estimated that about 30% of all people need medical care once in their life due to this index symptom. The neurological expertise required is usually scarce in underprivileged areas. One has to look for spontaneous nystagmus, and perform Dix-Hallpike maneuver and Head Impulse test specifically to differentiate central from peripheral vertigo. The nystagmus, that is spontaneous, involuntary to-and-fro movement of the eyeball which ai...

Effects of Lighting, Liquid Color, and Drink Container Type on Volume Perception.

This study explored the effects of geometric features (i.e., proportionate size and elongation) of tumblers and goblets on volume perception under different lighting environments and with different colors of liquid. Sixty individuals (30 men and 30 women) participated in an experiment that demonstrated volume perception of a specified amount (100 ml or 200 ml, depending on the container) by pouring water or red wine into different pairs of glasses. The results revealed the goblet and tumbler pairs in bo...

Front-Mediated Melting of Isotropic Ultrastable Glasses.

Ultrastable vapor-deposited glasses display uncommon material properties. Most remarkably, upon heating they are believed to melt via a liquid front that originates at the free surface and propagates over a mesoscopic crossover length, before crossing over to bulk melting. We combine swap Monte Carlo with molecular dynamics simulations to prepare and melt isotropic amorphous films of unprecedendtly high kinetic stability. We are able to directly observe both bulk and front melting, and the crossover betwee...

Holographic Sampling Display Based on Metagratings.

Glasses-free three-dimensional (3D) display is considered as a potential disruptive technology for display. The issue of visual fatigue, mainly caused by the inaccurate phase reconstruction in terms of image crosstalk, as well as vergence and accommodation conflict, is the critical obstacle that hinders the real applications of glasses-free 3D display. Here we propose a glasses-free 3D display by adopting metagratings for the pixelated phase modulation to form converged viewpoints. When the viewpoints are c...

Short-Range Structure, Thermal and Elastic Properties of Binary and Ternary Tellurite Glasses.

Glasses Al2/3O-TeO2, ZnO-TeO2 and R2/3O-ZnO-TeO2 (R=Al, B) were prepared by melting in Pt crucibles and studied for correlations between structure and thermal as well as mechanical properties, whereby the glass composition is varied to tailor the short-range speciation of tellurite, aluminate and borate groups. The glass structure was studied by Raman and infrared spectroscopy and the measured properties include glass transition temperature (Tg), density (ρ) and ultrasonic longitudinal (VL) and transverse ...

Bioactive glasses and glass-ceramics versus hydroxyapatite: comparison of angiogenic potential and biological responsiveness.

Different bioactive glasses, bioceramics and their composites were extensively analysed in terms of biological responsiveness and angiogenic potential. In particular several inorganic materials were considered, namely the widely used 45S5 bioactive glass (BG), an experimental BG with low tendency to crystallize, other three experimental bioactive glasses doped with strontium and/or magnesium, a commercial hydroxyapatite (HA), and two BG-HA composites (with varying percentages of bioactive glass and HA). All...

CI Solvent Yellow 14 (Sudan I) identified as the allergen in a plastic part of glasses.

Design of all-solid W-type index fluorotellurite fibers with near-zero-flattened chromatic dispersion for optical frequency comb generation.

All-solid W-type index fluorotellurite fibers (AWFTFs) with near-zero-flattened dispersion profiles are designed for optical frequency comb (OFC) generation. The fiber core and cladding materials are ${{\rm TeO}_2} {\text - } {{\rm BaF}_2} {\text - } {{\rm Y}_2}{{\rm O}_3}$TeO-BaF-YO (TBY) and fluoroaluminate glasses. Those two glasses have large refractive index contrast as well as similar thermal expansion coefficients and softening temperatures. The zero-dispersion wavelength of the TBY glass is about 25...

Additive manufacturing of platinum group element (PGE) standard reference materials with a silica matrix.

The microanalytical community has an outstanding need for PGE standard reference materials, particularly for trace element analysis by LA-ICPMS. NIST glasses contain Rh, Pd, and Pt, but lack Ru, Os, and Ir. Synthesis of silicate PGE standards has proven difficult due the tendency of PGEs to form metallic nuggets.

Study of environment friendly bismuth incorporated lithium borate glass system for structural, gamma-ray and fast neutron shielding properties.

The present work is aimed at incorporating the heavy metal oxide 'bismuth oxide' in lithium-borate glass system and studying its effect on the glass structure, durability, gamma-ray and neutron shielding ability. The density, XRD, Raman, FTIR, and UV-Visible spectroscopic techniques assisted in understanding the structure of ternary bismuth‑lithium-borate glass system. It has been found that the glass samples are of amorphous nature and structure is mainly built up of BO, BO, BiO BiO units and non-bridgin...

Strontium-releasing mesoporous bioactive glasses with anti-adhesive zwitterionic surface as advanced biomaterials for bone tissue regeneration.

The treatment of bone fractures still represents a challenging clinical issue when complications due to impaired bone remodelling (i.e. osteoporosis) or infections occur. These clinical needs still require a radical improvement of the existing therapeutic approach through the design of advanced biomaterials combining the ability to promote bone regeneration with anti-adhesive properties able to minimise unspecific biomolecules adsorption and bacterial adhesion. Strontium-containing mesoporous bioactive glas...

Analysis of chromophores in stained-glass windows using Visible Hyperspectral Imaging in-situ.

This work presents the implementation of Visible Hyperspectral Imaging for the in-situ analysis of glass chromophores in two glass windows from the Casa-Museu Dr. Anastácio Gonçalves (Lisbon, Portugal). The measurements were taken inside the building using natural sunlight as the illumination source. In addition, advantages and disadvantages of the followed methodology are discussed. The Dining Room glass window presents glasses colored in bulk with iron, manganese, cobalt, copper, and chromium; silver st...

Cytotoxicity and bioactivity assessments for Cu and La doped high-silica sol-gel derived bioglasses: The complex interplay between additive ions revealed.

We show the influence of two functional ions (Cu and La ), incorporated into a quaternary (Si, Ca, Na, P) Sol-Gel derived bioactive glass system, on its particle size, cytotoxicity and bioactivity. By doping the parent glass with the two ions in singular or combined forms, fifteen doped glasses were prepared by a rapid Sol-Gel technique. The influence of the combined doping on the particle size and cell viability was successfully evaluated by the aid of signal-to-noise-ratio (S/N), using Taguchi analysis. T...

Topological Origins of the Mixed Alkali Effect in Glass.

The mixed alkali effect, the deviation from expected linear property changes when alkali are mixed in a glass, remains a point of contention in the glass community. While several earlier models have been proposed to explain mixed alkali effects on ionic motion, models based on or containing discussion of structural aspects of mixed-alkali glasses remain rare by comparison. However, transition range viscosity depression is many orders in magnitude for mixed-alkali glasses, and the original observation of the...

Molecular Dynamics Simulation of Amorphous SiO, BO, NaO-SiO, NaO-BO, NaO-BO-SiO Glasses with Variable Composition and with CsO and SrO Dopants.

Selection of suitable glass composition for vitrification of high level radioactive waste (HLW) is one of the major challenges in the nuclear waste reprocessing. Atomic and molecular level understanding of various structural, thermodynamical and dynamical properties of glass matrix can help in preliminary screening and thus reduces the burden to some extent on the tedious experimental procedures. In that context, extensive molecular dynamics (MD) simulations have been performed to calculate the various micr...

Sound attenuation in stable glasses.

Understanding the difference between the universal low-temperature properties of amorphous and crystalline solids requires an explanation for the stronger damping of long-wavelength phonons in amorphous solids. A longstanding sound attenuation scenario, resulting from a combination of experiments, theories, and simulations, leads to a quartic scaling of sound attenuation with the wavevector, which is commonly attributed to the Rayleigh scattering of sound. Modern computer simulations offer conflicting concl...

Conventional occlusion versus pharmacologic penalization for amblyopia.

Amblyopia is defined as impaired visual acuity in one or both eyes without demonstrable abnormality of the visual pathway, and is not immediately resolved by wearing glasses.

Performance of complex visual tasks using simulated prosthetic vision via augmented-reality glasses.

Photovoltaic subretinal prosthesis is designed for restoration of central vision in patients with age-related macular degeneration (AMD). We investigated the utility of prosthetic central vision for complex visual tasks using augmented-reality (AR) glasses simulating reduced acuity, contrast, and visual field. AR glasses with blocked central 20° of visual field included an integrated video camera and software which adjusts the image quality according to three user-defined parameters: resolution, correspond...


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