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From: Dissociated Vertical DivergencePerceptual Correlates of the Human Dorsal Light Reflex Arch Ophthalmol. 2002;120(9):1174-1178. doi:10.1001/archopht.120.9.1174 Figure Legend: In the fish, increasing luminance to the right eye by shining a light from the 1-o'clock position (as seen by the animal) shifts subjective vertical clockwise toward the 1-o'clock position(as seen by the animal). Visual objects aligned with the gravitational vertical are therefore misregistered as being tilted counterclockwise toward the 11-o'clock position relative to the animal's subjective vertical. A, Vertical objects and the animal's body are subjectively misregistered as being tilted counterclockwise, necessitating a clockwise body tilt toward the body position thatCopyright is necessary for American equal binocular © 2002 Medicalvisual input. B, When a corrective body tilt is Date of download: 5/10/2017 prevented, the ocular component of this righting reflex evokes a vertical divergence of the eyes to rotate the interpupillary axis Association. All rights reserved. toward a position that is perpendicular to the altered subjective vertical. From: Dissociated Vertical DivergencePerceptual Correlates of the Human Dorsal Light Reflex Arch Ophthalmol. 2002;120(9):1174-1178. doi:10.1001/archopht.120.9.1174 Figure Legend: Visual tilt evoked by monocular occlusion in the strabismic human with dissociated vertical divergence. Gray image of the pencil denotes perceived visual tilt immediately following occlusion of one eye. Curved arrows denote the perceived rotation of the tilted visual image back to vertical, coinciding with the appearance of dissociated vertical divergence. On occlusion of either eye, the vertical pencil positioned in the sagittal plane is perceived as instantaneously tilted, with its upper pole tipped toward the side of the covered eye. This subjective visual tilt is quicklyCopyright followed © by2002 a perceived Americanrotation Medicalback to vertical that coincides with the cyclovertical Date of download: divergence of the 5/10/2017 eyes. Association. All rights reserved. From: Dissociated Vertical DivergencePerceptual Correlates of the Human Dorsal Light Reflex Arch Ophthalmol. 2002;120(9):1174-1178. doi:10.1001/archopht.120.9.1174 Figure Legend: Depiction of perceived visual tilt following monocular occlusion in patients with dissociated vertical divergence. SV indicates the subjective vertical (the patient's internal representation of vertical). A perceived tilt of the visual environment (a tilt of the subjective visual vertical) is determined by the position of vertical objects in the visual world relative to the internal representation of vertical (ie, relative to the subjective vertical). Left, Occlusion of the left eye evokes a monocular tilt in the subjective vertical. Since the visual environment is perceived in relation to the tilted Copyright subjective©vertical, which the patient perceives as vertical, the monocular visual 2002 American Medical Date of download: 5/10/2017 environment, as viewed with the right eye, is now Association. perceived asAlltilted counterclockwise relative to the patient's subjective vertical. rights reserved. Right, The human dorsal light reflex is a twofold movement consisting of a primitive vertical divergence, which realigns the