What Is Binocular Diplopia?

Binocular diplopia is a phenomenon in which the eyes of two eyes converge at one point, and the points before or after the compound point are regarded as double images (except for the single image area of the field of vision), and the double images disappear when one eye is closed. When the two eyes are near the gaze point, when the left eye is closed, the right eye sees the left image, and when the right eye is closed, the left eye sees the right image. On the other hand, if you look at the eyes that are far away from the gaze point, close one of them, and the other eye will see the same side of the image. The distance of the image at the gaze point determines whether the image seen by one eye crosses or is on the same side when the other eye is closed, thus providing a clue for deep vision. ^[1]

Diplopia

Diplopia can be divided into monocular diplopia and binocular diplopia.

1 Binocular diplopia 1 monocular diplopia

"Monocular diplopia" is caused by diseases of the eye itself. The reasons are: refractive error (especially astigmatism), corneal lesions, cataracts, dislocation of lens, iris atrophy, surgical removal of iris (become two pupils), vitreoretinopathy. In addition, hysteria and blindness can cause diplopia.

2 Binocular diplopia 2 binocular diplopia

"Binocular diplopia" is caused by the ocular muscles or the inner neuropathy that they dominate. The causes are: myasthenia, diabetes, thyroid exophthalmia, brain tumor, stroke, aneurysm, multiple neurosclerosis, pharyngeal cancer, and trauma (burst of the orbital wall, which causes the external eye muscle to become stuck).