scholarly journals COLORBLIND VISION

1947 ◽  
Vol 31 (2) ◽  
pp. 141-152 ◽  
Author(s):  
Selig Hecht ◽  
Yun Hsia
Keyword(s):  
Color Vision ◽  
Total Loss ◽  
Test Field ◽  
Receptor System ◽  
System A ◽  
Normal Color Vision ◽  
Circular Test

1. Measurements have been made of the dark-adapted foveal threshold of normal and colorblind persons in five parts of the spectrum using a 1° circular test field. 2. Compared to normals, protanopes (red-blinds) show an elevation of the threshold which increases slowly from blue to yellow and rises rapidly thereafter until in the red the threshold is more than ten times as high as normal. Deuteranopes (green-blinds) do not show so high an elevation, their maximum in the green being only about 70 per cent above normal. 3. These threshold elevations correspond to luminosity losses in the spectrum. For the protanope the total loss in the spectrum is nearly one-half of the normal luminosity; for the deuteranope it is nearly two-fifths of normal. 4. Such losses support the idea that colorblindness corresponds to the loss of one of the three receptor systems usually postulated to account for normal color vision. However, the color sensations reported by colorblind persons, especially monocular colorblinds, do not support the idea of a lost or inactivated receptor system. A fresh explanation for colorblindness is called for to reconcile these conflicting kinds of evidence.

Color-blindness simulation for red-green and blue-yellow ambiguity

2021 ◽  
pp. 1-12
Author(s):  
Sheida Anbari ◽  
Hamid Reza Hamidi ◽  
Shokoh Kermanshahani
Keyword(s):  
Color Vision ◽  
Color Perception ◽  
Color Blindness ◽  
Daily Activities ◽  
Reasonable Accuracy ◽  
Simulation Performance ◽  
Normal Color Vision ◽  
Test Kit ◽  
Different Types ◽  
Color Vision Test

Color blindness has important effects on people’s daily activities, since most activities require a discernment between colors. It is very important for engineers and designers to understand how colorblind people perceive colors. Therefore, many methods have been proposed to simulate color perception of people affected by Dichromacy and anomalous Trichromacy. However, the simulation results rarely have been evaluated with the reports of concerned individuals. In first study, we tried to simulate the color perception of people with different types (red and green) and different degrees of color blindness. Different degrees of red-green deficiency is simulated on the 24-plates brand of the Ishihara color vision test kit. Then simulated plates were tested on people with normal color vision. The results show that the simulation performance is better in the case of high degrees of red-green deficiency. There is also a clear difference between the assessment of female and male volunteers. In another study, the perception of the color of people with blue-yellow blindness is also considered. The proposed blue-yellow blind simulation is compared with the result of another research project. The results show that the color perception of individuals with different degrees of blue-yellow blindness can be reconstructed with a reasonable accuracy.

On Knowing Books by Their Colors

1979 ◽  
Vol 48 (2) ◽  
pp. 479-488 ◽  
Author(s):  
Robert M. Boynton ◽  
Stanley Dolensky
Keyword(s):  
Color Vision ◽  
Recognition Task ◽  
Color Blindness ◽  
Test Period ◽  
Normal Color Vision ◽  
Abstract Stimulus ◽  
Color Cues ◽  
Stimulus Materials ◽  
Search And Recognition ◽  
Better Than

In a search and recognition task utilizing real-world objects, the usefulness of color cues is observed to depend upon the availability of alphanumeric information. Following a 45-sec. inspection of a randomly selected collection of 17 books, spread on a table with their titles exposed, subjects were asked to identify as many of these as possible during a test period beginning 3 min. later in which 17 decoys were also present. Some subjects wore glasses with red filters during the test and inspection periods. The color blindness thereby introduced did not impair their performance in comparison with control subjects who were able to utilize normal color vision. Moreover, the introduction of color during the test period impaired the performance of subjects who had been deprived of color cues during inspection. It was concluded that subjects paid attention mostly to book titles and for that reason did not use other cues, including color, to much advantage. In a second experiment, where titles were obscured, subjects with normal color vision performed much better than those who were made color blind during the inspection or test periods. The results of both experiments are generally consistent with predictions based on experiments which have used abstract stimulus materials.

Variations in normal color vision II Unique hues

2000 ◽  
Vol 17 (9) ◽  
pp. 1545 ◽  
Author(s):  
Michael A. Webster ◽  
Eriko Miyahara ◽  
Gokhan Malkoc ◽  
Vincent E. Raker
Keyword(s):  
Color Vision ◽  
Normal Color Vision ◽  
Unique Hues

More than three different cone pigments among people with normal color vision

1993 ◽  
Vol 33 (1) ◽  
pp. 117-122 ◽  
Author(s):  
Jay Neitz ◽  
Maureen Neitz ◽  
Gerald H. Jacobs
Keyword(s):  
Color Vision ◽  
Normal Color Vision ◽  
Cone Pigments

Color Preference as a Function of Background and Illumination

1971 ◽  
Vol 33 (3_suppl) ◽  
pp. 1083-1088 ◽  
Author(s):  
Julie Hopson ◽  
Rosemary Cogan ◽  
Carole Batson
Keyword(s):  
Visual Field ◽  
Color Vision ◽  
Short Wave ◽  
Color Preference ◽  
Illumination Intensity ◽  
Background Illumination ◽  
Color Preferences ◽  
Normal Color Vision ◽  
Preference Orders ◽  
Background Brightness

90 students with normal color vision reported color preferences for 10 3-in. X 5-in. Munsell papers with a Munsell value/chroma of 5/6 on white, gray, or black backgrounds with a 5-in. X 7-in. visual field exposed for 2-sec. intervals. Colors of short wave lengths tended to be preferred. Preferences for colors were less extreme when colors were viewed on a black background. Illumination intensity did not reliably affect color preferences. The importance of evaluating the extent of preference differences between colors adjacent in preference orders was discussed. Background brightness and illumination did not clearly resolve differences in preference orders found in earlier studies, and the possible influence of other stimulus variables was discussed.

Preferred memory color difference between the deuteranomalous and normal color vision

2015 ◽  
Author(s):  
YeSeul Baek ◽  
Youngshin Kwak ◽  
Sungjoo Woo ◽  
Chongwook Park
Keyword(s):  
Color Vision ◽  
Color Difference ◽  
Normal Color Vision

scholarly journals A cace of Low normal color vision in father and daughter

2017 ◽  
Vol 46 (0) ◽  
pp. 231-237
Author(s):  
Hiroaki Kowashi ◽  
Daisuke Nishioka ◽  
Sakiko Yamaguchi ◽  
Erika Adachi ◽  
Kumiko Matsuoka ◽  
...  
Keyword(s):  
Color Vision ◽  
Normal Color Vision

Evaluation Accepted Small Color-Difference Samples by Using High Glossy Ink-Jet Paper

2011 ◽  
Vol 380 ◽  
pp. 179-182
Author(s):  
Jing Liang ◽  
Ning Fang Liao ◽  
Yu Sheng Lian ◽  
Yuan Yuan Wang
Keyword(s):  
Color Vision ◽  
Color Space ◽  
Visual Assessment ◽  
Color Difference ◽  
Normal Color Vision ◽  
Visual Color ◽  
Difference Formula ◽  
Ink Jet ◽  
Human Color Vision ◽  
High Range

In order to study the human color vision characteristics, the small color-difference discrimination threshold experiment at the 17 basic CIE color centers of high range of gloss color printed samples. A panel of 10 observers with normal color vision performed the visual assessment to 510 pairs of samples using admissibility method. The evaluation data of visual color-difference were obtained in CIELAB color space. The detailed comparision indicated that the data were used evaluate the four common color-difference formula, CIELAB, CIE94, CMC and CIEDE2000. The detailed analysis indicated that CIELAB recommended by CIE Performanced the best among the four modern color difference. For predicting very small color datas. The experimental data provides references for the improvement of uniform color space and color-difference formula.

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