Abstract
Naturally, we find ourselves at this time upon a theoretical basis, and must erect some kind of a theory, but in doing this must give the preference to that which conflicts least with known facts.— Graefe, Arch. Ophth., 1866, vol. 12, p. 147. The object of binocular vision is appreciation of the third dimension, which enables a person to relate himself to the objects in the world about him that are beyond his reach. A single eye appreciates two dimensions only, and two eyes are absolutely necessary to perception of depth, as will later appear. With two eyes there is a much greater protection against blindness also. Each eye receives its image from a different angle, and the modern range-finding apparatus used by the army and navy is modeled on the plan of human binocular vision. The similarity is seen if one studies the old problem, If the base line
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