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Diplopia can also occur when viewing with only one eye; this is called monocular diplopia, or where the patient perceives more than two images, monocular polyopia. While serious causes rarely may be behind monocular diplopia symptoms, this is much less often the case than with binocular diplopia. [ 15 ]
Cerebral diplopia or polyopia describes seeing two or more images arranged in ordered rows, columns, or diagonals after fixation on a stimulus. [ 1 ] [ 2 ] The polyopic images occur monocular bilaterally (one eye open on both sides) and binocularly (both eyes open), differentiating it from ocular diplopia or polyopia.
Many cases are asymptomatic, however patients many have decreased vision, glare, monocular diplopia or polyopia, and noticeable iris changes. [2] [5] On exam patients have normal to decreased visual acuity, and a "beaten metal appearance" of the corneal endothelium, corneal edema, increased intraocular pressure, peripheral anterior synechiae, and iris changes.
In contrast, monocular double vision doesn’t go away when a person closes one eye, he said. This type is not caused by strabismus. Some people with misaligned eyes may not have double vision.
"Suppression is familiar to anyone who has trained himself to look through a monocular microscope, sight a gun, or do any other strictly one-eye task, with the other eye open. The scene simply disappears for the suppressed eye." [1] Suppression is frequent in children with anisometropia or strabismus or both. For instance, children with ...
Those with small iridodialyses may be asymptomatic and require no treatment, but those with larger dialyses may have corectopia or polycoria and experience monocular diplopia, glare, or photophobia. [3] [4] [5] Iridodialyses often accompany angle recession [6] and may cause glaucoma [7] or hyphema. [8] Hypotony may also occur. [9]