The Vision Produces Successive Contrast

When the visual stimulation of external objects stops, the image sensation on the retina of the eye will not disappear immediately, this visual phenomenon is called visual afterimage. The occurrence of visual afterimage is due to the effect of traces left by nerve excitation, also known as visual afterimage.

If the eyes continuously see two scenes, that is, when you look at one and then look at another, the vision produces successive contrast, so it is also called continuous contrast. There are two kinds of visual afterimage: when the visual nerve excitation has not reached the peak, the afterimage left over due to visual inertia is called the positive afterimage; The fatigue caused by overexcitation of the optic nerve induces the opposite result called negative afterimage. Both positive afterimage and negative afterimage are sensations occurring in the visual process of the eye, and they are not objective real images.
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