PURPOSE The color change reached in two commercial disinfecting solutions for soft contact lenses using new color indicators has been analyzed, and its relationship with the temporal evolution of the hydrogen peroxide concentration, responsible for the disinfection process, has been examined. The results are compared with another commercial solution using a different color indicator. METHODS ...

The purposes of this study are: (1) determine the color of the twenty shades in the Ivoclar’s Chromascop shade guide, (2) determine the color representation of the shade guide described as coverage error (CE), and (3) compare this shade guide with the Vita Classical and Bioform shade guides. The spectral data was collected using Beckman model DU reflectance spectrophotometer equipped with an in...

Introduction: OMEGA/Mars Express data was confirmed by CRISM/MRO data of the existence of clay minerals on the surface of Mars [1, 2]. These clays have been found in some of the oldest terrains of Mars and because of their Noachian age, they hold clues to the earliest history of the martian surface. Clays have been detected in outcrops surrounded by lava flows and in the ejecta of small impact ...

Evidence from imaging studies suggests that primary visual cortex and multiple areas in ventral occipitotemporal cortex subserve color perception in humans. To learn more about the organization of these areas, we used structural and functional MRI (fMRI) to examine a patient with damage to ventral cortex. An art professor, KG, suffered a cerebrovascular accident during heart surgery that impair...

Purpose: To determine the reliability of TwoDocs computerized test for the evaluation of color vision and contrast sensitivity in normal adults. Methods: Thirty normal volunteers aged from 20 to 30 years (mean 23.3 years) had their color vision and contrast sensitivity tested by a new computerized test (TwoDocs test). Informed consent was obtained from all participants before testing. Inclusion...

Progressive cone dystrophy (CD) is usually marked in the initial stages by reduced visual acuity, color vision deficiency and alterations in the photopic electroretinogram, while morphological alterations can be very mild; in some forms rods are affected in a later stage as well. We examined 40 patients with progressive cone dystrophy to determine the extent of functional losses in the cone sys...

A novel method of extracting color information on a pixel-by-pixel basis or by the average regions interest (ROIs) from digital images is proposed and demonstrated using newly developed customized image-processing/analysis software (PicMan). For quantitative statistical analyses color, can be used for archive forensic applications in various fields. The differences between unrelated, similar, i...

El objetivo fue la evaluación del color como técnica rápida para identificación de muestras suelos urbanos contaminados con metales pesados en Ciudad México. Las concentraciones los se midieron por fluorescencia rayos X, y el determinó las tablas Munsell un colorímetro. A partir valores Hue, Value Croma formaron cinco grupos suelo color: I, Café rojizo oscuro, 5YR 4/2; II, Gris 7.5YR 4/1; III, ...