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At least 397 records · Page 22Linked to original sources
PubMed1984

Assessment of children's colour vision using the Pickford-Nicolson anomaloscope.

The colour vision of 439 boys, aged 4-11 years, was measured by the Pickford-Nicolson anomaloscope and four pseudoisochromatic tests. Matching range and dispersion of mid match point were found to be larger than adult values, but did not decrease with age. However, younger children took longer to establish matching range. Twenty-eight (6.4%) colour defectives were found and it is concluded that the Pickford-Nicolson anomaloscope gives valid results with children.

Age Factors↗
PubMed1980

Traumatically acquired color vision defect.

A 24-year-old man acquired a color vision defect shortly after an accident in which he struck the back of his head. Results of the Farnsworth-Munsell 100-hue test showed that the patient had poor color discrimination in both eyes. His color matches on the Nagel anomaloscope suggested a red/green disturbance. Results from increment threshold testing demonstrated on absence of the blue mechanism. Results of field sensitivity measurements confirmed that foveal vision was mediated by the red or green mechanism. This case showed both similarities and differences to previously reported cases of acquired color vision defects secondary to cortical trauma.

Accidents, Traffic↗
PubMed1995

[Study on color misnaming among the congenital color vision anomalous--Part 1. The tendency in color misnomer].

I report the hue and the color misnomers of 16 subjects with protanopia (color misnomers: 500) and 66 subjects of deutanopia (color misnomers: 2,056), and the color misnomers used by over 10 subjects each and their numbers. Green was the most frequent misnomer, followed by grey, yellow-green, purple, and brown. The deutanopia patients frequently used the Munsell color notation RP for grey. Many of the subjects who misnamed 11 times or more failed the Panel D-15 test. They were diagnosed as having strong color anomaly in the Ohkuma isochromatic plates and in the Tokyo Medical College isochromatic plates. The misnomers were most frequent among the neighboring hues. The severer the anomaly, the further the separation from the test color, and then the misnomers crossed the achromatic confusion line. Judging from the misnomer variation, the color sense of color anomaly does not necessarily seem to be constant. Moreover, liaison was noticed among red, brown, green, or occasionally purple in terms of misnaming pattern. Grey and pink were also linked in misnaming. Lightness was considered to play a strong role in these confusions.

Adolescent↗
PubMed1995

[Panel D-15 test under reduced illumination for persons with color vision defects].

We evaluated the panel D-15 test under reduced illumination in subjects with color vision deficiency and in normal subjects. Forty subjects with color vision deficiency (3 protanopes, 10 protanomalies, 10 deuteranopes, 7 extreme deuteranomalies and 10 deuteranomalies) and 10 normal subjects were the subjects for the experiment. Seven light levels ranging from 0.9 to 900 lux were used. All normal subjects passed the test at 3.5 lux or more and 30% failed at 0.9 lux. Color vision defective subjects began to fail the test at 225 lux, with 56% failing at 3.5 lux and 92% at 0.9 lux. The performance on the panel D-15 test decreased in proportion to decreasing the illumination in some color vision defective subjects. Some protanomalous subjects showed a deutan pattern at low illumination levels.

Adolescent↗
PubMed1995

Recognition performance of subjects with color-vision deficiencies on a polychromatic sonar screen for ship navigation.

To facilitate differentiation between objects that are approaching, stationary, and moving away, these objects are represented in different colors on the screens of sonar locating devices used in ship navigation. Yellow represents stationary objects, and represents approaching objects, and green represents those objects moving away. A total of 46 subjects with normal color vision and 184 individuals with color-vision deficiencies, among them 29 deuteranopic, 100 deuteranomalous, 21 protanopic and 34 protanomalous individuals, were investigated for their ability to identify different signals. Ten different objects were presented for a period of 64 s each. As a minimal requirement it was established that 50% of the respective experimental group be capable of recognizing the objects within half of this time. Whereas 73.3% of the subjects with normal color vision could meet this requirement, none of the subjects in the different groups with color-vision deficiencies could do so. Only 16.1% of the deuteranopic subjects, 33.1% of the deuteranomalous individuals, 16.2% of the protanopic subjects, and 37.6% of the protanomalous individuals detected all objects within 32 s. No appreciable difference in the ability to recognize signals occurred among the different groups of subjects with color-vision deficiencies.

Color Perception↗