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. Author manuscript; available in PMC: 2017 Nov 14.
Published in final edited form as: Ophthalmology. 2017 Jan 9;124(4):496–504. doi: 10.1016/j.ophtha.2016.11.039

Figure 1.

Figure 1

Cover-induced exotropia is equal to spontaneous exotropia. A, Recordings from a 26-year-old woman (refraction: plano both eyes [OU]) during fixation on a 0.5-degree target at 57 cm. The mean position (solid line) and standard deviation (shading) are shown for the right eye (red) and left eye (blue). At t ¼ 0 seconds, a shutter occluded either the right eye or the left eye, inducing an exodeviation. n = number of events. Positive and negative values for horizontal deviation denote right and left gaze, respectively. B, Spontaneous exotropia occurring intermittently between cover-induced episodes has an amplitude nearly equal to shutter-induced exotropia, with a difference of 0.1 degree for right exotropia and 0.4 degree for left exotropia. The shapes of the mean position traces and the variability in individual position traces are also similar. C: Recordings from a 36-year-old woman (refraction: −1.00 OU), showing a larger exotropia. D: Interspersed episodes of spontaneous fusion loss are similar to those from shutter occlusion, with an amplitude difference of 0.7 degrees for right exotropia and 1.4 degrees for left exotropia.