Negative lenses, either in the form of glasses or contact lenses, can correct nearsightedness. Unlike contact lenses, glasses do not only correct, but also induce optic distortions. In the scientific literature, it has often been assumed that people who wear corrective glasses instantaneously account for these distortions when they put their glasses on. We tested this assumption and found that,...

In particular, chalcogenide glasses and glass-ceramics are new materials that exhibit good transparency in infrared region (0.8-12µm). We can overcome the main weakness of these glasses by improving the hardness through controlling crystallization. In this paper, we report results of a study on chalcogenide glasses in the ternary system of As-Se-Ge with nominal composition of Snx (Se...

PURPOSE To evaluate the repeatability of power profiles measured on NIMO TR1504 (Lambda-X, Belgium) and investigate the effects of lens decentration on the power profiles for single vision (SV), bifocal (BF) and multifocal (MF) contact lenses. METHODS Accuracy of the sphere power was evaluated using single vision BK-7 calibration glass lenses of six minus and six plus powers. Three SV and fou...

Deixis expressed by three definite articles is a well-known characteristic of the Pomak varieties, given the absence of grammaticalized definite markers in most Slavic languages. In this paper, we present a practically unknown use of deixis in Slavic languages, namely the use of deictic suffixes in the formation of temporal subordinate conjunctions in Pomak. The deictic suffixes in the temporal...

OBJECTIVE To assess the effect of provision of free glasses on academic performance in rural Chinese children with myopia. DESIGN Cluster randomized, investigator masked, controlled trial. SETTING 252 primary schools in two prefectures in western China, 2012-13. PARTICIPANTS 3177 of 19,934 children in fourth and fifth grades (mean age 10.5 years) with visual acuity <6/12 in either eye wit...

Glasses from Mauna Loa pillow basalts, recent subaerial vents, and inclusions in olivine were analyzed for S, Cl, F, and major elements by electron microprobe. Select submarine glasses were also analyzed for H2O and CO2 by infrared spectroscopy. The compositional variation of these tholeiitic glasses is dominantly controlled by crystal fractionation and they indicate quenching temperatures of 1...

The unique property of phosphate-based glasses and fibres to be completely dissolved in aqueous media is largely dependent on the glass composition. This article focuses on investigating the effect of replacing Na2O with 3 and 5 mol% Fe2O3 on cytocompatibility, thermal and dissolution properties of P2O5-CaO-Na2O-MgO-B2O3 glass system, where P2O5 content was fixed at 45 mol%. The effect of incre...

Active Shutter Glasses (also known as Liquid Crystal Shutter (LCS) 3D glasses or just Shutter Glasses) are a commonly used selection device used to view stereoscopic 3D content on time-sequential stereoscopic displays. Regrettably most of the IR (infrared) controlled active shutter glasses released to date by various manufacturers have used a variety of different IR communication protocols whic...

X-ray Absorption Fine Structure (XAFS) spectroscopy has been widely used to characterize the short-range order of glassy materials since the theoretical basis was established 45 years ago. Soon after the technique became accessible, mainly due to the existence of Synchrotron laboratories, a wide range of glassy materials was characterized. Silicate glasses have been the most studied because the...

An extract of polyphenols was obtained from organic red grape pomace, chemically analyzed, and used for functionalization two bioactive glasses porous hydroxyapatite. Functionalization is effective on hydroxyapatite the glass with higher surface reactivity a different grafting mechanism. Grafting does not inhibit redox radical scavenging activity polyphenols. The grafted make continuous layer a...