ABSTRACT
The lens design problem is, therefore, that of correcting the aberrations of a biocular magnifier to a balance of residuals that both eyes in combination will deem to be acceptable. Biocular display optics refers to those optical systems that provide two-eye vision of an object seen from only one viewpoint. The optical design requirements for noncollimated biocular viewers differ considerably from those where near-collimation is a prerequisite, for example, head-up display optics. The biocular viewers described thus far have been designed nominally for close-up viewing, that, is with the eyes positioned some 50–80 mm from the magnifier and with the head most probably restrained by a brow pad. In the biocular overlap region, a stereoscopic image is visible. Toward the edge of the field of view, the image seen by a given eye flips over to the other view; at that point there is a small jump in picture perspective.
