Diplopia

(dip-lo'-pe-ah). Double vision, one object being seen by the eye or eyes as two. D., Binocular, the most frequent, is due to a derangement of the muscular balance, the images of the object being thereby thrown upon non-identical points of the retinae. Cro ed, or D., Heteronymous, the result of divergent strabismus, the image of the right eye appearing upon the left side, and that of the left eye upon the right side. D., Direct, or D., Homonymous, the reverse of Cro ed D., due either to paralysis of the external rectus or V over-action of the internal rectus. D., Physiologic, that produced when an imperfect image is seen beyond or within the distance of the object accommodated for and transfixed by the visual axes. D., Monocular, or D., Uni ocular, diplopia with a single eye, usually due to poly coria or other imperfections of the media.