Results 171 to 180 of about 6,627,792 (217)
Some of the next articles are maybe not open access.
Applying the Ishihara test to a PC-based screening system
Displays, 1999Abstract Aim: A commonly used method to examine the ability of the visual system to discriminate colours is based on isochromatic plates, such as the Ishihara plates. This article will introduce a computer-based method to determine red–green colour deficiencies based on presenting Ishihara plates using a CRT monitor.
Marino Menozzi
exaly +2 more sources
Ishihara test performance and dementia
Journal of the Neurological Sciences, 1996Ishihara trail-tracing (TT) and number-naming (NN) tests were administered to a clinical sample of 378 demented patients. Error counts on TT and NN tests were best fit by a negative binomial (overdispersed Poisson) distribution. TT, NN, and combined (TT + NN) error counts were regressed on patient characteristics (sex, age, and education), severity of ...
R, McCleary +3 more
openaire +2 more sources
RESPONSES TO THE ISHIHARA TEST FOR COLOR PERCEPTION
Archives of Ophthalmology, 1949SEVERAL tests have been devised to detect abnormalities of color perception. The easiest, and the most convenient for mass examination, are those using the pseudoisochromatic plates, of which the Ishihara test is one. Owing to the ease with which it can be made, this test has been used frequently to determine the incidence of defective color vision in ...
J B, NOLASCO, D, RODIL
openaire +2 more sources
Ishihara color plates as a test for simultanagnosia
American Journal of Ophthalmology, 1998To alert ophthalmologists to the use of Ishihara color plates in the detection of simultanagnosia.We examined seven patients referred for impaired vision. Evaluation included color plate testing with Ishihara color plates.All seven patients had simultanagnosia, with marked difficulty in identifying the numbers in Ishihara color plates despite adequate ...
P W, Brazis +3 more
openaire +2 more sources
Screening for mild anomalous trichromacy using the Ishihara plates test
Journal of the Optical Society of America A, 2023The Ishihara plates test is one of the most established and widely used means of identifying color vision deficiencies. However, literature examining the effectiveness of the Ishihara plates test has identified weaknesses, particularly when screening for milder anomalous trichromacy.
Somers, Lucy P., Bosten, Jenny M.
openaire +2 more sources
EFFECT OF QUALITY OF ILLUMINATION ON THE RESULTS OF THE ISHIHARA TEST
Archives of Ophthalmology, 1946THIS is the third in a series of reports dealing with the Ishihara test for color blindness. In the first of these reports 1 the fifth edition of the test was evaluated as a means of detecting and analyzing defective color vision. The data reported were collected during the course of a study of 106 persons having defective color vision of varying types
L H, HARDY, G, RAND, M C, RITTLER
openaire +2 more sources
Comparison of the Standard Pseudoisochromatic Plates to the Ishihara Color Vision Test
Optometry and Vision Science, 1987ABSTRACT The Standard Pseudoisochromatic Plates (SPP) color vision test was compared to the Ishihara color vision test with respect to screening validity, digit confusion errors, and individual plate efficiency. Results from 315 1st and 3rd grade males confirmed previous reports that the SPP is an effective screening test.
M K, Haskett, J K, Hovis
openaire +2 more sources
The Ishihara Test for Colour Blindness
Nature, 1944Vernon and Straker1 claim that 5·37–9·45 per cent of colour blind men were found in Great Britain, according to district, averaging 7·49 per cent. This is about twice the accepted figure. They suggest the difference is due to use of "a modified form" of the Stilling and Ishihara Tests, which "picks out many of the colour-weak, or anomalous trichromats,
openaire +1 more source
Tests for the Detection and Analysis of Color-Blindness I The Ishihara Test: An Evaluation
Journal of the Optical Society of America, 1945The Ishihara test for color-blindness, taken as a representative type of polychromatic tests, fails to give more than a superficial evaluation of the state of an observer’s color vision. It can be utilized as a good rough screening test for red-green color blindness, but in so doing most of the plates could be discarded.
LeGrand H. Hardy +2 more
openaire +1 more source
Efficiency of the Ishihara test for identifying red-green colour deficiency
Ophthalmic and Physiological Optics, 1997The Ishihara test is the most widely used screening test for red-green colour deficiency. Results obtained by 401 people with red-green colour deficiency show that the combined sensitivity of the Transformation and Vanishing plates of the 38 plate Edition of the Ishihara plates is 95.5% on eight errors, 97.5% on six errors and 99.0% on three errors ...
openaire +2 more sources