Related ImageThe most terrifying thing is to accept oneself completely. - Carl Jung
spc Bd 1 Bd 3
Share This Page

Chapter 9 - Color:
Purkinje Effect
1   2   3   4   5   6   7   8   9   Chapter 9 - Color:

Chapter 9 - Color:
Retinal Rivalry

Retinal Rivalry. - Many curious effects may be obtained by stimulating the two retinas with lights respectively different in color. For example, it is interesting to place a blue glass before one eye and a yellow or red one before the other. The two independent monocular fields strive for supremacy and this rivalry is quite impressive. For a moment the whole field may appear of one color and then suddenly it will appear of the other color. Apparently the fluctuation of attention is a factor. Usually it does not seem to be possible to reach a quiescent state or a perfect mixture of the two colors in this manner.

The dependence of one monocular field upon the other, and also their independence, are emphasized by this experiment. It is of interest to consider the optical illusions of reversible perspective and others in Chapter V in this connection.

An interesting result of retinal rivalry can be experienced by combining two stereoscopic pictures, one black and one white. The apparently solid object will appear to possess lustre. The experiment may be tried with Fig. 69 by combining the two stereoscopic pictures by converging or diverging the axes of the eyes as described in connection with Fig. 2 and Fig. 3.

Chapter 9 - Color:Retinal Rivalry
Fig. 69. - By combining these stereoscopically the effect of
metallic lustre (similar to graphite in this case) is obtained.

[Editor's Note - This optical illusion may be more easily seen on a printout than on your computer screen. In any case, it can take up to a couple of minutes for your eyes to combine the two images.

It will be noted that in order for two stereoscopic pictures, when combined, to produce a perfect effect of three dimensions their dissimilarity must be no more than that existing between the two views from the two eyes respectively. The dissimilarity in Fig. 69 is correct as to perspective, but the reversal of white and black in one of them produces an effect beyond that of true third dimension. When the colors are so arranged in such pictures as to be quite different in the two the effects are striking. There is, in such cases, an effect beyond that of perfect binocular combination.

By means of the stereoscope it is possible to attain binocular mixture of colors but this is usually difficult to accomplish. The difficulty decreases as the brightness and saturation of the colors decrease and is less for colors which do not differ much in hue and in brightness. These effects may be studied at any moment, for it is only necessary to throw the eyes out of focus for any object and to note the results. Many simple experiments may be arranged for a stereoscope, using black and white, and various combinations of colors. For example, Fig. 65 may be combined by means of double images (produced by converging or diverging the optical axes) so that the two inner squares are coincident. Actual observation is much more satisfactory than a detailed description.

Chapter 9 - Color:
Purkinje Effect
1   2   3   4   5   6   7   8   9   Chapter 9 - Color:

Visual Illusions E-Book

Download instructions sent within 24 hours.
About This Book Preface Chap 1, Introduction Chap 2, The Eye Chap 3, Vision Chap 4, Geometrical Chap 5, Figures Chap 6, Angles Chap 7, Depth/Distance Chap 8 Brightness/Contrast Chap 9, Color Chap 10, Lighting Chap 11, Nature Chap 12, Painting/Decorating Chap 13, Architecture Chap 14, Magic Mirror Chap 15, Camouflage

Optical Illusions

We have free optical illusions, 3D illusions, real illusions, cool illusion and more.
Get the Explanation
for this
Optical Illusion
Link To This Site Send Site To A Friend See Related Links Link To The Site Map Comments/Suggestions
Contact Us Report A Broken Link To Us

See our florist directory.

We have facial skin care products for anti-aging skin care.

Optical Illusions

Visual Illusions

Optical Illusions Book


Site Map | Terms of Use | Privacy & Security | Contact Us | Purchase Agreement | Send Feedback
An optical illusions book discussing the science of optical illusions.
© 1996-2011 by All Rights Reserved.