Bauhaus-Universität Weimar

Most of us possess two monocular fields, the left- 
hand one and the right-hand one. These two fields 
are alike in general outlines but differ in particulars. 
Looking through the window with the right eye closed, 
we see the window bars crossing the scene over the 
way ; looking with the left eye closed we see the scene 
practically as before, but the bars cross it in different 
places. Closer examination shows us that the two fields, 
although in the main alike, differ everywhere as to par¬ 
ticulars of size and arrangement. This becomes very 
apparent when the eyes are opened and closed in rapid 
What happens when both eyes are open ? Our two 
flat monocular fields differ from each other ; when both 
are combined into one binocular field the general out¬ 
lines are as before, but the field receives an entirely new 
character, that of depth or relief. JBy combining two 
slightly different fields from flatland, the result becomes 
a model in spaceland. The laws that govern this com¬ 
bination form the problems of binocular vision. 
We will suppose two monocular fields to be present 
with their points of sharpest vision. We will disregard 
the unusual cases where the scene for one eye is different 
from that for the other ; and Will suppose the two mon-


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