Assertion: body's size | /r/HasProperty | perceived
Facets:
value: by combining visual angle
type: MANNER
Source sentences:
text: Thus, Ibn al-Haytham held that size is perceived by combining the visual angle that a body subtends with perception of its distance, to arrive at a perception of the true size of the object.
text: Descartes held that size is perceived by combining visual angle with perceived distance, but he now treated visual angle as the extent of an object's projection onto the retina.