ABSTRACT
The perception of size, an extremely important aspect of the perception of objects, is a branch of the psychologyofvision.The physiologist, whobegins with the retina and ends with an eye movement or other motor reaction, has nothing to do with it. This is because the retina only registers angular measurements, while the size of a visual object depends on the distance as well as the visual angle. A short distance canbe estimatedwith thehelp of stereoscopy, but at greater distances the stationary eye is not able to estimate independently the distance and thevisual angle by physiological means.This can be easily demonstrated by an experiment. In a completely dark passage a 30-cm band of light at 3 metres cannot be distinguished from a 3-metre band of light at 30 metres.
