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Biomedical subjects

P Lanthony

Publications and source records attributed to P Lanthony.

At least 37 records · Page 2Linked to original sources
PubMed1984

[Pulfrich phenomenon].

A physiological and clinical study of the Pulfrich stereo-phenomenon was performed. The most important physiological parameters are object movements, luminous factors, and the position and movement of the eyes. Our experimental research emphasizes the retinal illumination factors, modified by many optical devices (pinhole, stenopeic slit, etc.); the paradoxical perceptive aspects of the Pulfrich phenomenon; and, above all, outlines the negligible role of the metric factors. The Pulfrich phenomenon is mainly time-dependent, and is defined as a stereoscopic illusion related to the temporal disparity between the visual input arising from the two eyes at the time of their cortical integration. In ocular pathology, 267 subjects were studied, the ocular abnormalities being divided into diseases of the pupil, cornea and vitreous body, cataracts, retina, optic nerve, glaucoma and strabismus. The difference between the spontaneous Pulfrich phenomenon and the provoked Pulfrich phenomenon is stressed: the spontaneous Pulfrich phenomenon is rare (14% of subjects); by itself it is anomalous and is a functional symptom his mechanism may vary according to the etiology; on the contrary, the provoked Pulfrich phenomenon is a normal phenomenon, induced by a filter in front of one eye; its absence is pathological either with the filter in front of the better eye, the bad eye, or of each in turn. In clinical practice this lack is frequent (46% of subjects), and is related to an alteration of binocular vision, but without etiological specificity.

Depth Perception↗
PubMed1982

[Daltonism and painting].

The influence of daltonism on painting was studied by Geothe. After a brief historical review, the methods employed are described. These included copying of paintings, critical analysis of paintings by color-blind subjects, and speculations on the history of art. The manner of painting of persons with daltonism depends upon the pictorial consequences of the dyschromatopsia, and the compensatory procedures employed: monochrome or polychrome. Acquired dyschromatopsia also affects painting. Daltonism influences esthetic taste and has to be taken into account during orientation of art students.

Aged↗
PubMed1978

The desaturated panel D-15.

The Desaturated Panel D-15 is analogous in design to the standard Panel D-15 but of lower purity (chroma 2 Munsell); the test is more sensitive to mild and moderate losses in chromatic discrimination ability. Combination of the results of both tests allows recognition of several degrees of chromatic discrimination loss.

Child↗
PubMed1978

The new color test.

The New Color Test allows estimation of the neutral zone (separation phase) and the characteristic color confusions (classification phase) using Munsell colors. The width of the neutral zone is estimated by the ranges of hues confused with grey. The severity of chromatic discrimination loss for a given axis is estimated by the range of chromas confused with grey.

Color Perception Tests↗