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synoptophore

Also know as the major amblyoscope, the synoptophore is a reflecting mirror haploscopic device consisting of two angled tubes that present separate images to each eye. The tubes can be adjusted to vary the convergence or divergence angle, allowing measurement of the angle of ocular deviation at different gaze positions. The synoptophore disrupts sensory fusion to evaluate binocular vision and is also used for orthoptic exercises to treat conditions like strabismus and amblyopia.