Principles of Stereovision. cont'd

TM 9-258

e. In much the same manner when two objects are

distance of the objects from the observer, and their

distance from each other (A, fig 3-8). Other factors of

observed simultaneously, stereovision enables the

depth perception being equal, the wider the spacing

observer to judge the relative distance of one object from

between the pupils of the eyes, the better appreciation of

the other, in the direction away from the observer, or

depth, one should be able to secure by stereovision.

depth. This can be done with considerable accuracy

The farther one object is from the observer, the farther

without utilizing other characteristics which suggest

away the second object must be from the first, if the

nearness of distance.

f. The ability to distinguish the relative positions of

observer is to distinguish their relative positions

stereoscopically

two objects stereoscopically depends upon the

interpupillary distance of the observer's eyes, the

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