INTRODUCTION .......................................................................................................... 42 Trichromacy and the Trichromatic Theory .............................................................. 42 Psychol~hysical l~$timates of the Cone Sensitivities .................................................... 44 The Two-Color Procedure and the ~" Mechanisms ................

Special public attention was called to the subject in 1875 by an enquiry into the causes of a railway accident which had taken place in Sweden, from which it appears that colourblindness was the cause of the disaster. Our author having described colour-sensations, goes on to discuss the theories of colour-perception and colour-blindness, classifying the latter defect as total and partial. Total...

introduction:.color is the first quality attribute of food evaluated by consumers, and is therefore an important quality component of food which influences consumer’s choice and preferences (maguire, 1994). color measurement of food products has been used as an indirect measure of other quality attributes such as flavor and contents of pigments because it is simpler, faster and correlates well ...

Color vision starts with the absorption of light in the retinal cone photoreceptors, which transduce electromagnetic energy into electrical voltages. These voltages are transformed into action potentials by a complicated network of cells in the retina. The information is sent to the visual cortex via the lateral geniculate nucleus (LGN) in three separate color-opponent channels that have been c...

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...

To investigate the occurrence, causes, and risk factors of color vision deficiency among Taif, Saudi Arabia secondary school students. A cross-sectional study was carried out on schools, during the period from 1 to 31 June 2022. Secondary students, of Taif city, Saudi Arabia. Data were collected using a personal interview wit...