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cat’s visual system is the same as man’s, except perhaps in spectral sensitivity
(which might be expected in most animals to be optimised about the peak
emission of the sun). The foregoing comments are not intended to imply that
research on animals is of no use. Far from it - a lot of very valuable data has
come out of such studies. All that must be stressed is that it is not enough - it
must be supplemented by data obtained about man by whatever method
possible.
Much has been written on the anatomy and neuro-physiology of the eye. The
reader wishing to study these in depth is referred, for instance, to Pirenne and
Brindley. It is not the purpose of this book to go into these subjects in any
more detail than necessary to develop the subject of the title - Vision and
Acquisition. Instead the emphasis will be on a general consideration of
everything, both external and internal to the eye, which goes towards the ability
of man to see things in practice. An attempt will be made to show that at the
present time, whilst there are still a lot of unanswered questions, a real
possibility exists of estimating when many classes of visual stimuli can be
‘acquired’.
1.1 The meaning of acquisition
1.2 Factors affecting ‘seeing’
1.3 Aided vision
References
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