Abstract
The visual fields of six Siamese cats and one common cat were measured in the horizontal plane under monocular and binocular viewing conditions. Compared to the common cat the Siamese cats showed a reduction in visual response in the nasal halves of the visual fields of both right and left eyes. The binocular visual field (i.e. the field obtained with both eyes open) in the Siamese cat was similar to that found in the common cat. The nasal restriction in the monocular field of the Siamese cat is interpreted in terms of the suppression of neural activity in the aberrant pathway which, in this breed, is known to arise from the temporal retina and to project to the opposite lateral geniculate nucleus. The suppression is thought to be initiated by activity in the undisturbed crossed projection coming from the nasal retina of the same eye.
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