Abstract
It has long been known that binocular spatial localization becomes abnormal if the normal relation of the dioptric images on the respective retinas is altered by refractive lenses or by prisms. The development of aniseikonic or size lenses provided means by which sharply defined dioptric image patterns of various types could be precisely altered. The results show a great: variety in types of anomalous appearance that can arise in viewing different types of environment through the different types of size lenses. A very exact relation exists between the characteristics of the visual appearances and the characteristics of the altered stimulus-pat terns. Many of the anomalous appearances cannot be satisfactorily explained by the accepted vision theories.

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