The distinction should be made between the visual field, the area or extent of physical space that is being imaged on the retina, and the perceptual space in which visual percepts are located, which we call visual space. Confusion is caused by the use of Sehraum in the German literature for both. There is no doubt that Ewald Hering and his followers Tschermak, A. (1947). Einführung in die Physiologische Optik. Wien: Springer-Verlag meant visual space in their writings.
The visual field, the area or extent of physical space that is being imaged on the retina, should be distinguished from the perceptual space in which visual percepts are located, which we call visual space. Confusion is caused by the use of Sehraum in the German literature for both. There is no doubt that Ewald Hering and his followers meant visual space in their writings.
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Tschermak, A. (1947). Einführung in die Physiologische Optik. Wien: Springer-Verlag