By John D. Mollon (auth.), G. Verriest (eds.)
Colour imaginative and prescient Deficiences VIII brings jointly details at the most recent developments within the following parts of study: -Visual results of excessive lighting; -Effects of intoxications on color imaginative and prescient; -Ageing and imaginative and prescient; -Methods of exam; -Congenital defects; -Acquired defects; -Practical facets; -Physiological bases.
This quantity is a traditional follow-up on Volumes VI and VII released in 1981 and 1983 respectively by way of Dr. W. Junk Publishers.
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Extra info for Colour Vision Deficiencies VIII
8), as Zrenner and coworkers showed by recording spectral sensitivity. This corresponds to a coarsening of the receptive field pattern. Therefore, in early stages, spatial summation can compensate for the gradual decay of red-green discrimination. For this reason a pseudo-isochromatic plate which the patient fails in standard conditions, may be passed at reduced observation distance. , 1984). The '65' out of Stilling-Velhagen's plates proved to be best suited for this purpose. In a case of Ethambutol opticopathy this was the last of all plates which the patient still failed after nearly complete recovery.
60 .... <1l IJ... 50 o 50 100 150 200 Days Fig. 4. The results of the Rayleigh color matches. The fraction of red in the red-green mixture is plotted as a function of time in days. The zero point on the abscissa is the day of his first visit to our clinic. The open circle represents the midpoint for the unaffected eye. The closed circle with error bar shows the midpoint and the width of the acceptable matching range for the affected eye, respectively. characteristic responses were obtained. For the affected eye, slightly smal· ler weight for green was obtained for the 500 nm, 520 nm and 550 nm test light and for the 520 nm and 550 nm test light the reponses showed blue instead of yellow.
For the 580 nm test light, which is near the neutral point, a reduced weight for yellow and increased value of white was reported. Spectral sensitivity on white background The test sensitivities were measured on a white background of luminance 26 Affected 400 450 500 550 600 650 700 nm 400 450 500 550 600 650 700 nm Unaffected Fig. 5. The results of the dichoptic matching. The dominant wavelength presented to the affected eye is plotted on the upper line and connected to the matching dominant wavelength for the unaffected eye, plotted on the lower line.