A Pedigree for Three Types of Colour-Vision Defect

Nature ◽  
1953 ◽  
Vol 172 (4387) ◽  
pp. 1010-1010 ◽  
Author(s):  
R. W. PICKFORD
Keyword(s):  
Colour Vision ◽  
Vision Defect

Red/green colour defect among the Roman Catholic and non-denominational population

1978 ◽  
Vol 10 (2) ◽  
pp. 199-202 ◽  
Author(s):  
Stephen R. Cobb
Keyword(s):  
Catholic Schools ◽  
Colour Vision ◽  
Roman Catholic ◽  
The West ◽  
Green Colour ◽  
Vision Defect ◽  
Roman Catholics

SummaryPupils in schools in the Glasgow area show incidences of colour vision defect higher in the Roman Catholic schools than in the non-denominational. This may be due to the Celtic origins of Roman Catholics in the West of Scotland.

Colour vision defect among secondary school students in enugu, Nigeria: prevalence, pattern and impact

2020 ◽  
Vol 10 (5) ◽  
pp. 113-119
Author(s):  
Gloria C Eze ◽  
Nkiru Kizor -Akaraiwe ◽  
Amalachukwu A Chime ◽  
Cosmas C Anajekwu ◽  
Ifeoma N Asimadu ◽  
...  
Keyword(s):  
Secondary School ◽  
Activities Of Daily Living ◽  
Daily Living ◽  
Colour Vision ◽  
Secondary School Students ◽  
Demographic Data ◽  
School Students ◽  
Cross Sectional ◽  
Vision Defect ◽  
School Tasks

Aim: To determine the prevalence, pattern and impact of colour vision defects among public secondary school students in Enugu, Nigeria with a view to guiding the affected students on appropriate career choice. Methods: A descriptive cross-sectional study was carried out among students attending public secondary schools in Enugu-East Local Government Area, Enugu state. A total of 950 students (361 males, 589 females) were selected by multistage sampling. The students were assessed for colour vision using Ishihara 38 plate edition and Farnsworth D-15 colour caps. An interviewer-administered structured questionnaire was used to obtain the socio-demographic data and impact of colour vision on colour-related school tasks and activities of daily living. Data was analysed using statistical package foe social sciences, version 20. Result: The age of the students ranged from 10-20 years with mean age of 14.2 ± 1.9 years. Eleven (1.2%) students were found to have colour vision defect out of whom 9 were boys and 2 were girls, 6 (54.5%) were deutan and 5 (45.5%) were protan. No tritan defect was detected. Greater percentages of the students with colour vision defect had difficulties with colour-related school tasks and daily activities when compared to those with normal colour vision. Conclusion: Colour vision defect may affect students’ performance in colour-related school tasks and activities of daily living. Therefore, early detection of colour vision defect is important so as to guide in the choice of future career

scholarly journals COLOUR VISION IMPAIRMENT IN DIABETIC RETINOPATHY

2020 ◽  
Author(s):  
Rajmohan Seetharaman ◽  
Veerendra Godbole
Keyword(s):  
Diabetic Retinopathy ◽  
Colour Vision ◽  
Descriptive Study ◽  
17Th Century ◽  
Vision Impairment ◽  
Ocular Disease ◽  
Non Invasive ◽  
Vision Defect ◽  
Vision Defects ◽  
Visual Testing

Background & objectives: Colour vision defects associated with ocular disease have been reported since the 17th century. Objectives were to study prevalence of colour vision abnormalities associated with diabetic retinopathy & to study the type of colour vision defect associated with diabetic retinopathy.Methods: A longitudinal descriptive study was conducted.70 patients diagnosed with Diabetic Retinopathy were selected. Colour vision was tested by using Ishihara & HRR Pseudoisochromatic charts.Results: When Evaluated using HRR plates 29 (41.42%) patients were found to have colour vision impairment. Among them 20 (68.96%) patients had colour vision impairment of the blue-yellow axis purely & 3(10.34%) patients of red-green axis purely & 6(20.70%) patients of both axis. Interpretation & conclusions: Colour vision especially of the blue-Yellow axis was found to be affected in this study. Colour vision and visual testing can be used as cheap, quick, non-invasive, portable tool for screening of diabetic retinopathy.

Luminosity Curves of Populations of Class I and Class II Normals in Colour Vision

1976 ◽  
Vol 42 (3_suppl) ◽  
pp. 1143-1149 ◽  
Author(s):  
Stephen R. Cobb
Keyword(s):  
Colour Vision ◽  
Class Ii ◽  
Class I ◽  
Green Point ◽  
Vision Defect ◽  
Normal Colour ◽  
Unique Green ◽  
Comparison Field ◽  
Male Subjects ◽  
Lower Luminosity

18 Class I and 18 Class II male subjects for unique green point who had normal colour vision had their luminosity curves measured for 8 points in the spectrum on a Wright Colorimeter for a 2° field. The results confirm earlier findings on fewer subjects, i.e., that the Class II subjects had a consistently lower luminosity at about the 565-nm point in the spectrum. Further data were collected whereby the luminosity of subjects exhibiting the various types of colour defect were taken for this region of the spectrum to see whether the characteristic of the curves, at different levels of luminance of the comparison field, corresponded to the characteristics of the Class I and Class II cases. A new visual pigment model to account for the Unique Green Phenomenon and colour-vision defect data is proposed.

A model for colour vision defect

1980 ◽  
Vol 6 (4) ◽  
pp. 401-420
Author(s):  
S.R. Cobb
Keyword(s):  
Colour Vision ◽  
Vision Defect
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