[Decrease of relative amplitude of evoked visual potentials caused by the use of a prism]

In search for an objective method of defining the quality of the binocular vision the author used the visual evoked potentials. The point was before all to estimate the added up records from both eyes checking up whether the amplitude of this record increases in dependence on the fact whether we apply the stimulus to one or to both eyes. A straight dependence between a binocular record from the whole retina and a record from the maculae cannot be discovered. By macular stimulation after placing a prism occurs a lowering of the relative amplitude connected with a disturbance of binocular vision and this enables the differentiation between the presence or lack of the stereoscopic vision in dependence on the fact wheather diplopia occurs or it does not.