Flat Type Electro‐oculogram (Eog)

The EOG is influenced by the corneo‐retinal potential of the contralateral eye. This contralateral influence results in polarity reversal in severely destructed eyes which do not have their own corneo‐retinal potential. In eyes with a decreased corneo‐retinal potential the contralateral effect can cause polarity reversal only during the light adapted period. Contralateral influence on eyes with abolished light sensitive component but a relatively well preserved light‐insensitive component results in a paradoxical curve. Deterioration of the light‐sensitive part of the EOG concerns primarily the positive component. In severely impaired eyes the EOG value should be corrected to allow for the influence of the contralateral sound eye; a formula, devised for calculating the corrected values, is given in a second paper.