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...

Background: Many people are affected by color blindness but most of them remain undetected as they simply adapt to the environment to certain extent and some remain unaware of the disease. Objective: To find out the prevalence rate of color blindness in students of ages 6 years to 15 years, in various schools of Jalandhar. Methods: A prospective study was done on 3259 students to identify the p...

The Rayleigh match, a color match between a mixture of 545+670 nm lights and 589 nm light in modern instruments, is the definitive measurement for the diagnosis of inherited red-green color defects. All trichromats, whether normal or anomalous, have a limited range of 545+670 nm mixtures they perceive to match 589 nm: a typical color-normal match range is about 50-55% of 670 nm in the mixture (...

INVESTIGATIONS made by Motokawa and Mita (1942), Adrian (1945), Gastaut (1949), Johnson (1949), Schubert and Bornschein (1952), Armington (1952), Armington, Johnson, and Riggs (1952), Bornschein (1953), Burian (1954), and Auerbach and Burian (1955), and by other investigators, have revealed that-under suitable conditions of examination-the human electroretinogram (ERG) normally consists of a ph...

There is enormous variation in the X-linked L/M (long/middle wavelength sensitive) gene array underlying "normal" color vision in humans. This variability has been shown to underlie individual variation in color matching behavior. Recently, red-green color blindness has also been shown to be associated with distinctly different genotypes. This has opened the possibility that there may be import...

Color blindness deficiency is the inability or decreased ability to see the color, under normal lighting conditions. There is no actual blindness but there is a deficiency of color vision. Color blindness is of many types like Red-Green, Blue-Yellow etc.., In this paper we proposed a new method that the users used the histogram thresholding to create a green colour mask which when they applied ...

BACKGROUND Color blindness is a common X-linked genetic disorder. However, most of color blinds remain undetected due to absence of proper screening. Our study was to determine the prevalence of red-green color vision defects among Manipuri Muslim males and females. The study could help in decreasing birth of children with this disorder as Muslims commonly perform consanguineous marriage among ...