Rigid Lens Tear Pump Efficiency: Effects of Overall Diameter/Base Curve Combinations

Measurement of post-lens tear thickness.

PURPOSE A method to measure the tear film beneath a soft contact lens, referred to as post-lens tear thickness (PLTT), would have many applications to contact lens research. In this study a noninvasive technique for measuring the PLTT is presented. METHODS The feasibility of measuring the tear layer by optical pachometry was first assessed using a model eye. The baseline corneal thickness (B)...

Tear calcium levels and contact lens wear.

Hydrophilic contact lens spoliation can be associated with the deposition of calcium salts. The relationship between the concentration of calcium in tear fluid and contact lens use has been studied in healthy volunteers and in patients using various forms of hard and soft contact lenses, tear samples being collected with Schirmer strips and with lenses in situ. Methods are suggested for correct...

The Overall Efficiency in the Presence of Imprecise Adaptable Measures

White paper: Overall Equipment Efficiency

Overall Equipment Efficiency (OEE) by Pepperl+Fuchs GmbH, TE Connectivity, and Software AG The increase in overall equipment effectiveness (OEE) is one of the most important applications of Industrie 4.0. However, retrofitting existing production systems poses major challenges for plant operators. For this reason, Pepperl+Fuchs, TE Connectivity, and Software AG – companies that are technologica...

Predicting the yield curve using forecast combinations

An examination of the statistical accuracy and economic value of modeling and forecasting the term structure of interest rates using forecast combinations is considered. Five alternative methods to combine point forecasts from several univariate and multivariate autoregressive specifications including dynamic factor models, equilibrium term structure models, and forward rate regression models a...