Introduction: The visible spectrum (about 400 to 700 nm) with a mosaic of three classes photoreceptors compose the human visual system. They are sensitive different wavelength ranges overlapping. receivers have high sensitivities at short wavelengths (~440 nm), medium (~535 or longer (~565 which S, M, and L cones, respectively. study aimed determine blue color vision defects in diabetes mellitu...

CONTEXT Children with learning disabilities might have difficulties to communicate effectively and give reliable responses as required in various visual function testing procedures. AIMS The purpose of this study was to compare the testability of visual acuity using the modified Early Treatment Diabetic Retinopathy Study (ETDRS) and Cambridge Crowding Cards, stereo acuity using Lang Stereo te...

High-resolution multicolor printing based on pixelated optical nanostructures is of great importance for promoting advances in color display science. So far, most of the work in this field has been focused on achieving static colors, limiting many potential applications. This inevitably calls for the development of dynamic color displays with advanced and innovative functionalities. In this Let...

Background Recent survey data indicate that some people report long-term improvement in color vision deficiency (CVD), also known as blindness, following use of psychedelics such lysergic acid diethylamide (LSD) and psilocybin. However, there are no objective reported the medical literature quantifying degree or duration CVD associated with psychedelic use. Case presentation Here we present cas...

this study evaluates the effectiveness of adsorption process by granular activated carbon (gac) compared with a novel formulation of coagulation - flocculation process for dye removal from textile wastewater. in this regard, acidic, reactive, disperse and direct red dye are used to prepare the synthetic dye. dominant wave length for each dye is determined by spectrophotometeric method. using ga...

OBJECTIVE visual disorders are among the earliest symptoms of Alzheimer's disease. It is, however, still controversial as to whether Alzheimer's disease impairs colour vision. In this study, colour vision of Alzheimer's disease patients was tested using the Ishihara test and the PV-16 choice test. The latter test, primarily designed for children, was chosen in order to avoid problems due to cog...

Color-deficient observers are often confronted with problems in daily life due to the fact that some colors appear less differentiable than for normal sighted people. So-called daltonization methods have been proposed to increase color contrast for color-deficient people. We propose two methods for better daltonization solutions by Spatial Intensity Channel Replacement Daltonization (SIChaRDa)....