Color-blindnessHoughton, Osgood, 1880 - 316 стор. |
Загальні терміни та фрази
accident amongst appear blind Breslau bright brothers brown called centimetres chromatic defect chromatic sense Cohn color-blind person color-perception color-sense colored objects complementary colors confound congenital color-blindness d'Ocul danger dark daugh degree different colors distance Donders examination experience Farbenblindheit Farbensinnes Favre fuchsine give given Grammar School gray green light green-blind Helmholtz theory hence Holmgren's method incomplete color-blindness intensity of light kinds lanterns large number luminous Magnus method of testing Minder mistakes names of colors nature ness normal eye normal-eyed observer orange peculiar practical primary colors primitive colors Professor Holmgren purple railroad employés railway readily recognized red and green red or green red-blind reference reports retina Santonine saturated says scarlet sensation sense of color shades shown signals skeins spectrum surgeons Sweden testing for color-blindness Thomas Young tints tion Ueber violet violet-blind vision visual field whilst Wilson worsteds yellow and blue Young-Helmholtz theory
Популярні уривки
Сторінка 67 - Avaunt ! and quit my sight. Let the earth hide thee ! Thy bones are marrowless, thy blood is cold ; Thou hast no speculation in those eyes, Which thou dost glare with.
Сторінка 215 - II. b of the plate, rather towards yellowish red. " Rule. — This test, which is applied only to those completely color-blind, should be continued until the person examined has placed beside the specimen all the skeins belonging to this shade or the greater part, or else, separately, one or several...
Сторінка 5 - I accidentally observed the colour of the flower of the Geranium zonale by candlelight in the autumn of 1792. The flower was pink, but it appeared to me almost an exact sky-blue by day ; in candlelight, however, it was astonishingly changed, not having then any blue in it, but being what I called red — a colour which forms a striking contrast to blue.
Сторінка 13 - ... of a picture is immediately made manifest by a corresponding discord in the arrangement of its light and shade, or, as artists term it, the effect...
Сторінка 1 - A maid two and twenty years old came to me from Banbury, who could see very well, but no color beside black and white. She had such scintillations by night (with the appearances of bulls, bears, &c.) as terrified her very much. She could see to read sometimes in the greatest darkness for almost a quarter of an hour.
Сторінка 5 - That part of the image which others call red, appears to me little more than a shade, or defect of light; after that the orange, yellow, and green seem one colour, which descends pretty uniformly from an intense to a rare yellow, making what I should call different shades of yellow.
Сторінка 223 - ... of the plate. If the subject were allowed to depart from the narrow limits established by the trial, it would include every shade of green ; the result of which would be that he would prefer to select all the vivid shades, and thus avoid the dangerous ground where his defect would certainly be discovered. This is why it is necessary to oblige him to keep within certain limits, confining him to pure green specimens, and, for greater security, to recommend him to select especially the lightest...
Сторінка 40 - ... be considered as of different kinds. This division will be sanctioned, if we consider the relations in which it stands to the method pursued for discovering them, and which is based on the Young-Helmholtz theory. It is this we are about to explain. " We classify the different kinds of color-blindness under especial heads, to be able the better to grasp the whole. We might, indeed, divide this blindness into congenital and acquired ; but as such a division has reference alone to the mode of origin,...
Сторінка 205 - The rapidity with which this examination is made does not seem to directly correspond with the nature of the chromatic sense, but to depend wholly upon the character of the person examined. One of intelligence, with a quick, practical mind, is examined in less than a minute. In this time, in fact, a normal eye could easily find the four or five skeins of the same color as the sample, and the color-blind make a sufficient number of characteristic mistakes to thoroughly establish the diagnosis.
Сторінка 221 - The best plan for directing how to proceed is by oral instructions and de visu; but here we are obliged to accomplish this by description. Now, this is always defective in some respects, especially if we wish to be brief. What has been said would evidently suffice for an intelligent and experienced physician, but it may not be superfluous to enter still further into detail to provide against any possible difficulties and loss of time.