A memory color is an observer’s knowledge of a typical object color. The typicality of the memorized color implies that the observer considers the memory color to be representative or “canonical” for the range of colors, in which the respective object occurs. In this way, it determines the observer’s expectation about an object’s color based on her or his prior knowledge. For example, an observ...

Color is an inner, highly subjective experience only triggered by properties of light from the external world. Actual color perceptions are inextricably linked to (i) visual processing properties of observers that can vary greatly across individuals, and (ii) minor changes in viewing circumstances. Thus, it can be argued that color is not of this world, or, that color is not a veridical, or eve...

BACKGROUND We sought to investigate the association between blood pressure levels and prevalence of acquired color vision impairment in middle-aged Japanese men. METHODS Participants underwent color vision testing, ophthalmological examination, standardized interview, physical record examination, and venous blood examination. Cardiovascular disease risk factors were determined based on blood ...

In this paper, Daubechies orthogonal wavelets are used to compress color spectra. Color spectra have many forms from sharp peaks to constant value. Compression is needed to save space in storing and bandwidth in transmission of spectra. The underlying idea of this paper is to nd suitable wavelets for compression. Quality of compression and reconstruction is measured with color diierence E from ...

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...

To perform a more complete diagnosis on the effect of color vision deficiency on visual performance we measured luminance and color contrast threshold functions. Measurements were carried out on CRT for a range of spatial frequencies on color deficient and normal color vision individuals. Luminance and color contrast threshold is a measure of the recognition limits of low luminance and color co...

The groundwork for understanding color defects in eye disease was established by the end of the nineteenth century. Thereafter the field was neglected as scientists concentrated on studies of normal color vision and congenital color vision defects. Spurred by the development of the Farnsworth 100 hue-test, interest was renewed in the 1950s. The past 25 years have seen an explosion of interest i...

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 ...

Protanomaly is a common abnormality of color vision in which the long wavelength sensitive cone is lacking. Protanomalous observers are trichromatic with reduced ability to discriminate colors in the red-green part of the spectrum because the photopigments that mediate discrimination in this range are abnormally similar differing in one of two ways; first, by only a few nanometers in peak sensi...