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Binoculars with wide-angle peripheral vision

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Abstract

To scan a wide visual field the human eye rotates about a point located several millimeters behind its entrance pupil. Unless the eye is relocated with reference to the eyepiece to view a particular portion of the scanning field, this limits the scanning field of view to a function of the optical system exit pupil diameter and the pupil diameter of the eye. This limitation is implicit in the design of binoculars, and results in the unnecessary reduction of peripheral vision for the static eye because the field stop is used to restrict the scanning vision to a well corrected limit. If the instrument is held firmly to the head so that the user cannot scan the peripheral portion of the field, then the peripheral field can be increased significantly at low manufacturing cost because of the eye’s low resolution for extra-fovial images. New binoculars have been designed to significantly increase the peripheral vision using this concept. They have conventional objectives and prism systems, but employ negative power after the prisms to reduce prism size, and have simplified eyepieces. Additionally a positive field lens is moveable across the intermediate image to effect a rapid-change 2:1 dual power.

© 1993 Optical Society of America

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