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Devices designed to provide an image to one eye that must be drawn in a space only visible by the other eye. These devices typically include a septum that separates the two fields of views and a small mirror used to reflect the line drawing. Cheiroscopes are intended for assessing patient\'s binocular stability, eye alignment, and the presence and extension of suppression, a neurological condition in which the patient\'s brain shuts off an eye by blocking its visual input to avoid double vision. Training using cheiroscopes may contribute to improvement of binocular control and the elimination of suppression. Stereoscopes and other ophthalmic equipment may be modified to work as cheiroscopes (e.g., by using a cheiroscopic viewer attachment).
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