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Results for “Color Vision Defects”

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At least 739 records · Page 41Linked to original sources
PubMed1995

Color vision deficit in normal-tension glaucoma eyes.

Color vision deficit in 26 eyes with normal-tension glaucoma (NTG) is compared with that in 21 eyes with primary open angle glaucoma (POAG) using the color perimetry method developed by Iijima et al. Subjects had visual field defects confined to either the upper or the lower hemifield as determined by conventional white-on-white perimetry, and the stage of disease was relatively early with an average mean deviation (MD) of -7 dB. Except for intraocular pressure, there were no significant differences between NTG and POAG subjects in age, refraction, MD, and mean total deviation for spared and damaged hemifield. In the spared hemifield, the incidence of blue-yellow abnormality was significantly different between the two diseases (P = 0.01); in only 11% of the present NTG eyes versus 52% of the POAG eyes in the present study. In the damaged hemifield, however, the blue-yellow abnormality was found in about 75% of the eyes, whether NTG or POAG. This finding may further shed light on the pathogenesis of open angle glaucoma.

Adult↗
PubMed1988

[Chronic alcohol-tobacco poisoning: towards an early detection of optic neuropathy].

Forty-two patients (33 men, 9 women) with normal visual acuity admitted to an alcoholism rehabilitation programme were evaluated for colour vision using the automatized Fransworth-Munsell test (ChromopsR) and for central visual field using Friedmann's analyser. An early colour blindness without axis, i.e. a lack of colour discrimination, was often found. At the same time, in the more intoxications perimetric defects appeared in the 30 degrees area first centrally, then followed by arcuate superior scotomas.

Adult↗
PubMed1998

Colour blindness.

The physiology of colour vision is discussed; as is the way in which the human eye can detect various combinations of red, green and blue. Red-green colour blindness, with X-linked inheritance, is the most common, but other types are also considered. Methods of testing relating to the age of the child are reviewed. The use of colours in teaching is widespread, but there is controversy over the difficulties this may cause a colour blind child. A review of the literature does not reveal much information on this, and any problems that do arise are likely to be individual to the child, and to depend on such factors as overall intelligence, the attitude of the teacher, and the personality of the child. There is not doubt that it is essential to recognise colour vision defects when it comes to choosing a career, and that tests must be done during secondary schooling, but in order to avoid some affected children being disadvantaged there is enough evidence to support testing at school entry.

Child↗
PubMed1991

Velhagen Pfügertrident pseudoisochromatic plates in screening congenital red-green vision defects.

Red-green colour vision defects were screened in a group of 425 trade school students using Velhagen Pflügertrident pseudoisochromatic plates. Thereafter, the students were examined with the Nagel anomaloscope. Of the 425 students, 31 (7.3%) were found to be colour defectives. Deuteranomalous defects were found in 4.9% of cases; deuteranopic defects, in 0.2%; and protanomalous defects, in 2.1%. There were no protanopic students in the study group. The Velhagen plates found 19 of the 31 defectives (sensitivity, 61.3%); none of the students with normal colour vision were suspected of being colour defectives (specificity, 100%). The sensitivity of the Velhagen plates is not as high as that of other pseudoisochromatic tests. However, the Velhagen Pflügertrident test is easy to use when screening of pre-school-aged children is needed.

Adolescent↗
PubMed2000

Doctors and the assessment of blood glucose testing sticks: does colour blindness matter?

A group of doctors with congenital colour vision deficiency (CCVD) were compared with a group of controls in their assessment of colour blocks in the colour range of a widely available blood glucose testing stick. The majority of doctors with CCVD agreed with controls on colour matching. However, subjects with severe CCVD tended to match test blocks to a wider range of options than either those with a less severe defect or controls. This paper discusses the implications of these findings.

Adult↗
PubMed1991

Dominant cone dystrophy starting with blue cone involvement.

The results of ophthalmological and colour vision studies are reported on 13 patients from a family with a dominant cone dystrophy spanning seven generations. The onset of visual deterioration occurred in the third or fourth decade. In the early stages of the disease, when visual acuity is still close to normal, a severe defect in the blue sensitivity is already present, as measured by spectral sensitivity curves and other tests suitable for the detection of tritan defects. In our opinion this condition represents a distinct entity with autosomal dominant inheritance.

Adult↗
PubMedDate not supplied

Colour-blindness in Colombia.

The frequency of defective colour vision was studied in two neighbouring villages in the Andes Mountains of Colombia using AO H-R-R Pseudoisochromatic plates. The frequency of the red-green colour-blindness in males is almost the same in both villages (2.36-2.53%), being similar to frequencies reported for other mestizo' populations in Latin America. In one of the communities, families in which colour-blindness occurred were wealthier (P is less than 0.05) than non-colour-blind families, but there were no significant differences by colour vision class in numbers of surviving children nor mother's marriage age. These findings are consistent with the idea that in societies at the agricultural level, colour-blindness is selectively neutral. The association of colour-blindness with higher socio-economic status is expected given the history of European conquest in the New World, and suggests that the major cause of varying rates of the defect in Latin American populations is socio-economic heterogeneity and by inference different degrees of European-Amerindian admixture.

Age Factors↗