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These seven selected basic properties are a fair representation of 
   
the physiological aspects of vision. Their order reflects the development 
in time from infancy to childhood. Imaging Quality and Contrast 
Discrimination probably develop hand in hand, Spectral Sensitivity is a 
given property, but Colour Sensitivity seems developable (or should it 
be colour perception?) , and the Visual Activities are surely developed 
from the first day onwards, yet become stabilized only in the final stage 
of life, if out-developed at all. 
     
  
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7.7 SENSITIVITY 
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IMAGING 
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PHYSIOLOGICAL ASPECTS 
  
  
   
  
  
  
  
   
  
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FIG. 1. 
[4 quite different approach to this subject was made recently by the 
Director of the Centre for Visual Science at the University of 
Rochester, (Boynton 1961). In his invited paper on "Progress in 
Physiological Optics", detailed and quantitative information oan be 
found on some of the mentioned properties. There the reader can gain 
an idea of the various topios for research and of the recent 
discoveries in Visual Science,